CN109900615B - Soil permeability coefficient testing device and testing method thereof - Google Patents
Soil permeability coefficient testing device and testing method thereof Download PDFInfo
- Publication number
- CN109900615B CN109900615B CN201910190000.5A CN201910190000A CN109900615B CN 109900615 B CN109900615 B CN 109900615B CN 201910190000 A CN201910190000 A CN 201910190000A CN 109900615 B CN109900615 B CN 109900615B
- Authority
- CN
- China
- Prior art keywords
- soil
- liquid
- opening
- measuring tube
- sample
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002689 soil Substances 0.000 title claims abstract description 139
- 238000012360 testing method Methods 0.000 title claims abstract description 70
- 230000035699 permeability Effects 0.000 title claims abstract description 61
- 239000007788 liquid Substances 0.000 claims abstract description 175
- 238000002347 injection Methods 0.000 claims abstract description 69
- 239000007924 injection Substances 0.000 claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 13
- 229920006395 saturated elastomer Polymers 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims description 8
- 238000001802 infusion Methods 0.000 claims description 4
- 230000007480 spreading Effects 0.000 claims description 3
- 238000007667 floating Methods 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 103
- 230000003204 osmotic effect Effects 0.000 description 9
- 239000011521 glass Substances 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 4
- 238000007788 roughening Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention provides a soil permeability coefficient testing device and a testing method thereof, wherein the testing device comprises: the sample tube comprises a plurality of detachably connected sample layers, a cavity for containing soil to be tested is formed in each layer of sample layer, a first opening is formed in the upper end of the sample tube, a second opening is formed in the lower end of the sample tube, and the first opening is communicated with the second opening through a plurality of cavities. The measuring tube, the entry is connected in first opening, and the one end of the entry that keeps away from the measuring tube is equipped with the third opening. The liquid injection pipe is connected in the second opening, a fourth opening is formed in the liquid injection pipe, liquid is injected into soil to be tested and the measuring pipe through the fourth opening, and the position of the fourth opening is lower than that of the first opening. The test device can test the comprehensive permeability coefficients of multiple layers of different soils, can avoid inaccurate permeability coefficient test of the multiple layers of soils due to the influence of different soil layers, further simulate the outdoor soil layer structure more accurately, and improve the accuracy of the permeability coefficients of the soils.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a soil permeability coefficient testing device and a testing method thereof.
Background
The soil permeability coefficient is measured by two kinds of indoor tests and field tests, wherein the indoor tests generally adopt a constant liquid head permeability test and a variable liquid head permeability test, and the field tests generally adopt a field liquid injection test and a field liquid extraction test.
However, in-situ liquid injection test, a liquid pumping well is generally required to be drilled at a test site, liquid is required to be continuously pumped to soil for 6-8 days, meanwhile, the liquid pumping can be stopped after a stable sedimentation curve is formed by in-situ observation, and the like. When the permeability coefficient test of soil is carried out indoors, the permeability coefficient test of the permeability coefficient can only be carried out by simulating the structure of the single-layer soil once, the permeability coefficient of the multi-layer soil structure is calculated according to the permeability coefficients of the plurality of single-layer soil structures, the permeability coefficient test of the multi-layer soil cannot be carried out simultaneously, and in the actual soil, the multi-layer soil has the multi-layer structure, and the accuracy of the permeability coefficient of the multi-layer soil structure is low in the indoor test.
For example, chinese patent document with publication No. CN 207470190U discloses a device for simulating mud film formation on the excavation surface of a mud liquid shield and measuring the permeability coefficient of a mud film, which comprises a mud permeation film forming mechanism and a mud film permeability coefficient measuring mechanism, wherein the mud permeation film forming mechanism comprises an organic glass column, a first row of liquid valves, a flange plate, an air compressor, a pressure regulating device geotechnical cloth, a steel wire gauze, a beaker and a base, scale marks are arranged on the organic glass column, the mud film permeability coefficient measuring mechanism comprises a liquid changing head pipe, a scale and a liquid supply bottle, the liquid head pipe can pass through the base and is communicated with the bottom of the organic glass column, a second row of liquid valves are arranged between the liquid changing head pipe and the organic glass column, the scale is arranged on the liquid changing head pipe, the liquid supply bottle can be communicated with the bottom of the liquid changing head pipe, and the liquid can be supplied into the liquid changing head pipe.
Although the device can simulate the permeability coefficient of mud on the excavation surface of the mud liquid shield, the device adopts the organic glass column as an integrated structure, the permeability coefficient of a layer of mud layer is tested in the organic glass column, the permeability coefficients of multiple layers of soil layers cannot be measured at the same time, and thus, the error between the permeability coefficient of the tested soil layer and the permeability coefficient of the actual soil layer is larger.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect of low accuracy of a testing device for testing the permeability coefficient of a multi-layer soil layer indoors in the prior art, so as to provide a soil permeability coefficient testing device and a testing method thereof.
In order to solve the above technical problems, in one aspect, the present invention provides a soil permeability coefficient testing device, including:
The sample tube comprises a plurality of sample layers which are detachably connected, a cavity for containing soil to be tested is formed in each sample layer, a first opening is formed in the upper end of the sample tube, a second opening is formed in the lower end of the sample tube, and the first opening is communicated with the second openings through a plurality of cavities;
a measuring tube, an inlet is connected in the first opening, and a third opening is arranged at one end far away from the inlet of the measuring tube;
the liquid injection pipe, the entry is connected in the second opening, be provided with the fourth opening on the liquid injection pipe, through the fourth opening to survey soil and survey intraductal injection liquid, the position of fourth opening is less than the position of first open-ended.
Optionally, a bending part is connected to one end of the liquid injection tube away from the second opening, and the bending part extends towards the direction of the first opening.
Optionally, the device further comprises a control valve connected to the liquid injection pipe and suitable for controlling the opening and closing of the liquid injection pipe.
Optionally, the sample layers are threaded together.
Optionally, the sample layer at the uppermost end includes a body and a cover body covering the upper end of the body, the first opening is formed in the cover body, and the measuring tube is fixedly connected with the cover body.
Optionally, the measuring tube is a graduated tube.
Optionally, a reading recorder is further included for recording in real time the reading of the liquid level in the measuring tube.
Optionally, the device further comprises a light structure in the measuring tube, the light structure is suitable for floating on the liquid level in the measuring tube, and the reading recorder is arranged on the light structure;
the inner wall of the measuring tube extends to the center of the measuring tube to form a plurality of limiting structures for limiting the movement of the light structure in the radial direction of the measuring tube.
Optionally, the light structure is slidably connected to the limiting structure in an axial direction of the measuring tube.
Optionally, the limit structure includes the fixture block, the fixture block from the bottom of survey buret extends to the top of survey buret, light structure be equipped with fixture block sliding connection's recess.
Optionally, the device further comprises a transfusion tube arranged at the upper end of the measuring tube, wherein the transfusion tube is communicated with the measuring tube and is suitable for inputting liquid into the measuring tube.
Optionally, a roughening layer is arranged along the circumference of the inner wall of the sample layer, and is suitable for improving the tightness between the inner wall of the sample layer and the soil to be tested.
On the other hand, the invention also provides a method for testing the soil permeability coefficient, which comprises the following steps of:
Laying a bottom layer: paving soil to be detected in a bottom sample layer, injecting liquid into the soil to be detected through the liquid injection pipe until the soil is saturated, and stopping water injection operation;
laying a sample in an intermediate layer: installing a middle sample layer on the bottom sample layer, paving another soil to be detected on the middle sample layer, continuously injecting liquid into the soil to be detected until the other soil to be detected is saturated, and stopping the water injection operation;
Repeating the middle layer sample spreading step until all the soil to be detected is saturated with the liquid, continuing to fill the liquid in the measuring tube until the liquid in the measuring tube is full, and stopping the water filling operation;
Collecting data: and performing drainage operation on the bottom sample layer and the middle sample layer, and after the liquid outlet speed of the liquid injection pipe is uniform, acquiring a first height difference between the initial liquid level of the measuring pipe and the liquid level in the liquid injection pipe and a first time corresponding to the first height difference, and acquiring a second height difference between the final liquid level of the measuring pipe and the liquid level in the liquid injection pipe and a second time corresponding to the second height difference.
Optionally, the method further comprises opening a reading recorder after the liquid outlet speed of the liquid injection pipe is uniform so as to record the liquid level reading in the measuring pipe in real time.
Optionally, the method further comprises the following steps after the liquid outlet speed of the liquid injection pipe is uniform:
when the liquid level in the measuring tube is smaller than the preset height, stopping water injection operation, and injecting liquid into the measuring tube by adopting a liquid conveying tube;
And recovering the water injection operation until the liquid outlet speed of the liquid injection pipe is uniform, and then collecting data.
Optionally, the preset height is 15-20cm.
The technical scheme of the invention has the following advantages:
1. According to the testing device provided by the invention, the sample barrels are formed by connecting the plurality of layers of detachable sample layers, the cavity for containing the soil to be tested is formed in each layer of sample layer, the soil to be tested can be paved in the bottom layer of sample layer, then another soil to be tested is paved in the middle sample layer, so that a plurality of kinds of soil to be tested are paved in one sample barrel, simulation can be performed according to the actual thickness of each outdoor soil layer, and then the soil to be tested in the sample barrel is subjected to the osmotic coefficient test through the action of the measuring tube and the liquid injection tube.
Further, with the development of sponge cities, the comprehensive permeability coefficient of a multi-layer soil structure can be simulated indoors, a soil structure meeting the requirements is selected, and then the soil structure is paved outdoors according to the arrangement mode of the soil structure to replace the original outdoor soil, so that the permeability coefficient of the outdoor soil can be better improved, and the problem of water accumulation of the cities due to excessive rainwater is further solved.
2. According to the testing device provided by the invention, the bending part is connected to one end of the liquid injection pipe far away from the second opening, and extends towards the direction of the first opening, so that the liquid outlet rate of the liquid injection pipe can be reduced, the height difference between the measuring pipe and the liquid level in the liquid injection pipe can be recorded more accurately, and the accuracy of the osmotic coefficient is improved.
3. According to the testing device provided by the invention, the adjacent sample layers are in threaded connection, so that the sample layers are convenient to install and detach, and the installation time of the sample layers can be saved.
4. According to the testing device provided by the invention, the uppermost sample layer comprises the body and the cover body which is covered in the upper end of the body, the measuring tube is fixedly connected with the cover body, when the middle sample layer needs to be replaced, the cover body and the measuring tube can be integrally taken out, the middle sample layer can be replaced, the plugging work of the measuring tube is saved, the operation is convenient, and the damage to the measuring tube caused by repeated plugging of the measuring tube is avoided.
5. According to the testing device provided by the invention, the measuring tube is the scale tube, the liquid level in the measuring tube can be directly obtained through the scale tube, and other tools are not needed, so that the reading of the measuring tube is convenient and quick.
6. The testing device provided by the invention further comprises a reading recorder, the reading of the liquid level in the measuring tube can be recorded in real time through the reading recorder, and after the testing is finished, the reading can be derived through the reading recorder, so that the reading of the liquid level in the measuring tube can be more accurately obtained, and meanwhile, data errors and loss can be prevented.
7. According to the testing device provided by the invention, the light structure floats on the liquid level in the measuring tube, the reading recorder is arranged on the light structure, and the light structure can descend along with the descent of the liquid level in the measuring tube, so that the reading recorder also descends along with the liquid level, and further, the reading of the liquid level can be recorded all the time. The inner wall of the measuring tube is provided with a plurality of limit structures which can limit the movement of the light structure in the radial direction of the measuring tube, so that the light structure can move in the axial direction of the measuring tube along with the liquid level in the measuring tube, the rotation of the light structure caused by the liquid in the measuring tube is prevented, and the reading of the reading recorder is not timely and accurate.
8. The invention provides a testing device which further comprises a liquid conveying pipe arranged at the upper end of the measuring pipe, wherein the liquid conveying pipe is communicated with the measuring pipe, and when the liquid level in the measuring pipe is lower than a preset height and the permeability coefficient of soil is affected, liquid can be injected into the measuring pipe through the liquid conveying pipe so as to continuously measure the permeability coefficient of the soil.
9. According to the testing device provided by the invention, the edge of the soil to be tested is uneven, when the edge of the soil to be tested is directly contacted with the inner wall of the sample layer, the gap between the soil to be tested and the inner wall of the sample layer is larger, when the osmotic coefficient is measured, part of liquid flows out through the gap between the sample layer and the soil to be tested, and part of liquid does not pass through the soil to be tested, so that the osmotic coefficient of the soil is inaccurate.
10. According to the testing method provided by the invention, the soil to be tested is paved in the bottom sample layer, then another soil to be tested is paved in the middle sample layer, so that a plurality of kinds of soil to be tested are paved in one sample cylinder, simulation can be performed according to the actual thickness of each outdoor soil layer, then water is injected into the soil to be tested through the liquid injection pipe, a first height difference between the initial liquid level of the measuring pipe and the liquid level in the liquid injection pipe and a first time corresponding to the first height difference are obtained through obtaining the measuring pipe, and a second height difference between the final liquid level of the measuring pipe and the liquid level in the liquid injection pipe and a second time corresponding to the second height difference are calculated. The comprehensive permeability coefficient of the multilayer different soil can be tested by the test method, the inaccuracy of the permeability coefficient test of the multilayer soil caused by the influence of different soil layers can be avoided, the outdoor soil layer structure can be simulated more accurately, and the accuracy of the permeability coefficient of the soil is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a testing apparatus according to a first embodiment of the present invention;
Fig. 2 is a top view of the measuring tube of fig. 1.
Reference numerals illustrate:
1. a sample tube; 11. a sample layer; 111. a body; 112. a cover body; 113. a cavity; 12. a first opening; 13. a second opening; 2. a measuring tube; 21. a third opening; 22. a clamping block; 3. a liquid injection pipe; 31. a bending part; 32. a fourth opening; 4. a control valve; 5. a reading recorder; 6. a lightweight structure; 61. a groove; 7. a roller; 8. an infusion tube.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "liquid level", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1
One embodiment of the soil permeability coefficient testing apparatus as shown in fig. 1 to 2 includes:
the sample tube 1 comprises a plurality of sample layers 11 which are detachably connected, a cavity 113 for containing soil to be tested is formed in each sample layer 11, a first opening 12 is formed in the upper end of the sample tube 1, a second opening 13 is formed in the lower end of the sample tube 1, and the first opening 12 is communicated with the second opening 13 through a plurality of the cavities 113.
The measuring tube 2 has an inlet connected to said first opening 12, and a third opening 21 is provided at the end of the measuring tube 2 remote from the inlet.
The inlet of the liquid injection pipe 3 is connected to the second opening 13, a fourth opening 32 is arranged on the liquid injection pipe 3, liquid is injected into the soil to be measured and the measuring pipe 2 through the fourth opening 32, and the position of the fourth opening 32 is lower than that of the first opening 12.
According to the testing device, the sample tube 1 is formed by connecting the plurality of layers of detachable sample layers 11, the cavity 113 for containing the soil to be tested is formed in each layer of sample layer 11, the soil to be tested can be paved in the bottom layer of sample layer, then another soil to be tested is paved in the middle sample layer, thus, various soils to be tested are paved in one sample tube 1, simulation can be carried out according to the actual thickness of each outdoor soil layer, then the soil to be tested in the sample tube 1 is subjected to permeability coefficient test through the action of the measuring tube 2 and the liquid injection tube 3, the comprehensive permeability coefficient of the plurality of layers of different soils can be tested through the testing device, the inaccuracy of the permeability coefficient test of the plurality of layers of soil caused by the influence of different soil layers can be avoided, the outdoor soil layer structure can be simulated more accurately, and the accuracy of the permeability coefficient of the soil can be improved.
Further, with the development of sponge cities, the comprehensive permeability coefficient of a multi-layer soil structure can be simulated indoors, a soil structure meeting the requirements is selected, and then the soil structure is paved outdoors according to the arrangement mode of the soil structure to replace the original outdoor soil, so that the permeability coefficient of the outdoor soil can be better improved, and the problem of water accumulation of the cities due to excessive rainwater is further solved.
The soil to be measured can be cohesive soil, stone structure, sand structure or fine soil particles, etc. The permeability coefficient can be measured by the testing device.
The sample tube 1 can be made of stainless steel materials, rust can be generated after the sample tube 1 is placed for multiple measurements, and other materials which are not easy to be corroded by liquid can be adopted. In this embodiment, the liquid is water.
As shown in fig. 1, a bending portion 31 is connected to an end of the liquid injection tube 3 away from the second opening 13, and the bending portion 31 extends toward the first opening 12. Therefore, the liquid outlet rate of the liquid injection pipe 3 can be reduced, so that the height difference between the liquid level in the measuring pipe 2 and the liquid injection pipe 3 can be recorded more accurately, and the accuracy of the osmotic coefficient can be improved.
As shown in fig. 1, the measuring tube 2 is a graduated tube. Therefore, the liquid level in the measuring tube 2 can be directly obtained through the scale tube, and the reading of the measuring tube 2 is convenient and quick without other tools.
The adjacent sample layers 11 are in threaded connection, so that the sample layers 11 can be conveniently installed and detached, and the installation time of the sample layers 11 can be saved.
The sample layer 11 is provided with the screw thread at axial ascending tip, passes through threaded connection between the adjacent sample layer 11, in order to improve the leakproofness between the sample layer 11, can set up the sealing washer on the screw thread of sample layer 11, improves its leakproofness through the effect of sealing washer between the adjacent sample layer 11, prevents that the liquid in the sample section of thick bamboo 1 from flowing out through the clearance between the sample layer 11, influences the accuracy of the osmotic coefficient of soil that awaits measuring. A seal ring may be provided on the outer periphery of the joint between the plurality of sample layers 11, so that the liquid in the sample cartridge 1 can be prevented from flowing out through the gap between the sample layers 11.
A roughening layer is arranged along the circumferential direction of the inner wall of the sample layer 11, and is suitable for improving the tightness between the inner wall of the sample layer 11 and the soil to be tested.
Because the edge of soil to be measured is uneven, when it is direct and the inner wall contact of sample layer 11, the space between the inner wall of soil to be measured and sample layer 11 is great, when carrying out osmotic coefficient measurement, there is some liquid to flow through the clearance between sample layer 11 and the soil to be measured, because of some liquid does not pass through the soil to be measured, lead to the osmotic coefficient of soil inaccurate, through being provided with the roughening layer along the axial of the inner wall of test layer, the roughening layer can reduce the clearance with the soil to be measured, reduce the liquid throughput between sample layer 11 inner wall and the soil to be measured, namely, reduce the probability that sample layer 11 inner wall takes place to permeate, and then improve the rate of accuracy of osmotic coefficient of soil to be measured.
As shown in fig. 1, the uppermost sample layer 11 includes a main body 111 and a cover 112 covering the upper end of the main body 111, the first opening 12 is disposed on the cover 112, and the measuring tube 2 is fixedly connected to the cover 112. When the middle sample layer needs to be replaced, the cover 112 and the measuring tube 2 can be integrally taken out, the middle sample layer is replaced, the plugging work of the measuring tube 2 is saved, the operation is convenient, and the damage to the measuring tube 2 caused by repeated plugging of the measuring tube 2 is avoided.
The testing device further comprises a control valve 4 connected to the liquid injection pipe 3 and suitable for controlling the opening and closing of the liquid injection pipe 3.
Alternatively, the water pump may be connected to the fourth opening 32, and the water pump may control the opening and closing of the filling pipe 3.
As shown in fig. 1, the testing device further comprises a plurality of rollers 7 connected to the bottom of the sample tube 1, wherein the rollers 7 are provided with brakes. The device is convenient to move to an outdoor site, and the permeability coefficient of the soil to be tested is tested through the actual rainfall process.
As shown in fig. 1 and 2, the testing device further comprises a reading recorder 5 for recording in real time the reading of the liquid level in the measuring tube 2. After the test is finished, the reading can be led out through the reading recorder 5, so that the reading of the liquid level in the measuring tube 2 can be more accurately obtained, and meanwhile, data errors and loss can be prevented.
The reading recorder 5 may be a camera or other device that can record readings.
As shown in fig. 1 and 2, the test device further comprises a lightweight structure 6 in the measuring tube 2, adapted to float on the liquid surface in the measuring tube 2, the reading recorder 5 being arranged on the lightweight structure 6. The lightweight structure 6 can simultaneously descend along with the descent of the liquid level in the measuring tube 2, so that the reading recorder 5 also descends along with the liquid level, and can record the reading of the liquid level all the time.
As shown in fig. 2, the inner wall of the measuring tube 2 extends toward the center of the measuring tube 2 to form a plurality of stopper structures for stopping the movement of the lightweight structure 6 in the radial direction of the measuring tube 2. The limiting structure can limit the movement of the light structure 6 in the radial direction of the measuring tube 2, so that the light structure 6 can move in the axial direction of the measuring tube 2 along with the liquid level in the measuring tube 2, the light structure 6 is prevented from rotating due to the liquid in the measuring tube 2, and the reading of the reading recorder 5 is not timely and accurate.
The specific positions of the plurality of stopper structures formed on the inner wall of the measurement pipe 2 are not limited as long as the movement of the lightweight structure 6 in the radial direction of the measurement pipe 2 can be restricted. For example, when there are two limit structures, the two limit structures may be disposed opposite to each other on the inner wall of the measurement pipe 2; when the number of the limiting structures is three, the three limiting structures can be arranged in a triangular shape on the inner side of the measuring tube 2.
The lightweight structure 6 is slidably connected to the limiting structure in the axial direction of the measuring tube 2.
Specifically, as shown in fig. 2, the limiting structure includes a clamping block 22, the clamping block 22 extends from the bottom of the measuring tube 2 to the top of the measuring tube 2, and the lightweight structure 6 is provided with a groove 61 slidably connected with the clamping block 22.
As an alternative embodiment, the limit structure comprises a groove 61, the groove 61 extends from the bottom in the measuring hanger to the top of the measuring tube 2, and the lightweight structure 6 is provided with a clamping block 22 in sliding connection with the groove 61.
The lightweight structure 6 is a disc with an outer diameter equal to the inner diameter of the measuring tube 2. Therefore, the edge of the disc is attached to the inner wall of the measuring tube 2, the influence of the liquid level in the measuring tube 2 on the disc is further reduced, the movement of the disc in the radial direction of the measuring tube 2 is reduced, the accuracy of the liquid level reading of the measuring tube 2 is improved, and the accuracy of the permeability coefficient of soil is further improved.
Example two
The invention provides a method for testing soil permeability coefficient, which comprises the following steps of:
Laying a bottom layer: paving soil to be detected in a bottom sample layer, injecting liquid into the soil to be detected through the liquid injection pipe 3 until the soil is saturated, and stopping water injection operation;
laying a sample in an intermediate layer: installing a middle sample layer on the bottom sample layer, paving another soil to be detected on the middle sample layer, continuously injecting liquid into the soil to be detected until the other soil to be detected is saturated, and stopping the water injection operation;
repeating the middle layer sample spreading step until all the soil to be detected is saturated with the liquid, continuing to fill the liquid in the measuring tube 2, and stopping the water filling operation;
Collecting data: and (3) performing drainage operation on the bottom sample layer and the middle sample layer, and after the liquid outlet speed of the liquid injection pipe 3 is uniform, opening the reading recorder 5 to obtain a first height difference H 1 between the initial liquid level of the measuring pipe 2 and the liquid level in the liquid injection pipe 3, a first time T 1 corresponding to the first height difference, a second height difference H 2 between the final liquid level of the measuring pipe 2 and the liquid level in the liquid injection pipe 3, and a second time T 2 corresponding to the second height difference.
The permeability coefficient K of the soil to be measured can be calculated by using the following formula:
Wherein a is the radial cross-sectional area of the measuring tube 2; a is the radial sectional area of the soil to be measured in the sample tube 1 along the sample tube 1; l is the height of the soil to be measured in the sample tube 1 along the axial direction of the sample tube 1.
In the process of discharging the liquid, the liquid level in the liquid injection tube 3 is always in a full state, so that the liquid level in the liquid injection tube 3 does not need to be read, and the position of the fourth outlet of the liquid injection tube 3 is fixed.
The comprehensive permeability coefficient of the multilayer different soil can be tested by the test method, the inaccuracy of the permeability coefficient test of the multilayer soil caused by the influence of different soil layers can be avoided, the outdoor soil layer structure can be simulated more accurately, and the accuracy of the permeability coefficient of the soil is improved.
The method comprises the following steps of:
When the liquid level in the measuring tube 2 is smaller than the preset height, stopping the water injection operation, and injecting liquid into the measuring tube 2 by adopting the infusion tube 8. And recovering the water injection operation, and collecting data after the liquid outlet speed of the liquid injection pipe 3 is uniform. The preset height is 15-20cm.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (7)
1. A soil permeability coefficient testing arrangement, characterized in that includes:
The sample tube (1) comprises a plurality of detachably connected sample layers (11), a cavity (113) for containing soil to be tested is formed in each sample layer (11), a first opening (12) is formed in the upper end of the sample tube (1), a second opening (13) is formed in the lower end of the sample tube (1), and the first opening (12) is communicated with the second opening (13) through a plurality of the cavities (113);
a measuring tube (2), wherein an inlet is connected in the first opening (12), and a third opening (21) is arranged at one end far away from the inlet of the measuring tube (2);
The inlet of the liquid injection pipe (3) is connected in the second opening (13), a fourth opening (32) is arranged on the liquid injection pipe (3), liquid is injected into the soil to be detected and the measuring pipe (2) through the fourth opening (32), and the position of the fourth opening (32) is lower than that of the first opening (12);
One end of the liquid injection pipe (3) far away from the second opening (13) is connected with a bending part (31), and the bending part (31) extends towards the direction of the first opening (12);
the adjacent sample layers (11) are connected through threads;
the uppermost sample layer (11) comprises a body (111) and a cover body (112) covering the upper end of the body (111), the first opening (12) is arranged on the cover body (112), and the measuring tube (2) is fixedly connected with the cover body (112);
The measuring tube (2) is a scale tube;
The soil permeability coefficient testing device further comprises a reading recorder (5) for recording the reading of the liquid level in the measuring tube (2) in real time;
The soil permeability coefficient testing device further comprises a light structure (6) positioned in the measuring tube (2) and suitable for floating on the liquid level in the measuring tube (2), and the reading recorder (5) is arranged on the light structure (6);
The inner wall of the measuring tube (2) extends towards the center of the measuring tube to form a plurality of limiting structures for limiting the movement of the light structure (6) in the radial direction of the measuring tube (2);
The light structure (6) is in sliding connection with the limit structure in the axial direction of the measuring tube (2); the light structure (6) is a disc;
The limiting structure comprises a clamping block (22), the clamping block (22) extends from the bottom of the measuring tube (2) to the top of the measuring tube (2), and the light structure (6) is provided with a groove (61) which is in sliding connection with the clamping block (22);
the soil permeability coefficient testing device further comprises a transfusion tube (8) arranged at the upper end of the measuring tube (2), wherein the transfusion tube (8) is communicated with the measuring tube (2) and is suitable for inputting liquid into the measuring tube (2);
The method comprises the following steps of: when the liquid level in the measuring tube (2) is smaller than the preset height, stopping water injection operation, and injecting liquid into the measuring tube (2) by adopting the infusion tube (8); and recovering the water injection operation until the liquid outlet speed of the liquid injection pipe (3) is uniform, and then collecting data.
2. The soil permeability coefficient testing apparatus according to claim 1, further comprising a control valve (4) connected to the liquid injection pipe (3) and adapted to control opening and closing of the liquid injection pipe (3).
3. The soil permeability coefficient testing apparatus according to claim 1, wherein a roughened layer is provided along a circumference of the inner wall of the sample layer (11), adapted to improve sealability of the inner wall of the sample layer (11) with the soil to be tested.
4. A method for testing soil permeability coefficient, characterized in that the device for testing soil permeability coefficient according to claims 1-3 is used for the following steps:
laying a bottom layer: paving soil to be detected in a bottom sample layer, injecting liquid into the soil to be detected through the liquid injection pipe (3) until the soil is saturated, and stopping water injection operation;
laying a sample in an intermediate layer: installing a middle sample layer on the bottom sample layer, paving another soil to be detected on the middle sample layer, continuously injecting liquid into the soil to be detected until the other soil to be detected is saturated, and stopping the water injection operation;
Repeating the middle layer sample spreading step until all the soil to be detected is saturated with the liquid, continuing to fill the liquid in the measuring tube (2), and stopping the water injection operation;
Collecting data: and carrying out drainage operation on the bottom sample layer and the middle sample layer, and after the liquid outlet speed of the liquid injection pipe (3) is uniform, acquiring a first height difference between the initial liquid level of the measuring pipe (2) and the liquid level in the liquid injection pipe (3) and a first time corresponding to the first height difference, and acquiring a second height difference between the final liquid level of the measuring pipe (2) and the liquid level in the liquid injection pipe (3) and a second time corresponding to the second height difference.
5. The method according to claim 4, characterized in that the method further comprises opening a reading recorder (5) after the liquid outlet speed of the liquid injection pipe (3) is uniform, so as to record the liquid level reading in the measuring pipe (2) in real time.
6. The method for testing the permeability coefficient of soil according to claim 4, wherein "after the liquid outlet speed of the liquid injection pipe (3) is uniform" further comprises the steps of:
When the liquid level in the measuring tube (2) is smaller than the preset height, stopping water injection operation, and injecting liquid into the measuring tube (2) by adopting the infusion tube (8);
And recovering the water injection operation until the liquid outlet speed of the liquid injection pipe (3) is uniform, and then collecting data.
7. The method for testing soil permeability coefficient according to claim 6, wherein the predetermined height is 15-20cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910190000.5A CN109900615B (en) | 2019-03-13 | 2019-03-13 | Soil permeability coefficient testing device and testing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910190000.5A CN109900615B (en) | 2019-03-13 | 2019-03-13 | Soil permeability coefficient testing device and testing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109900615A CN109900615A (en) | 2019-06-18 |
| CN109900615B true CN109900615B (en) | 2024-04-26 |
Family
ID=66952134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910190000.5A Active CN109900615B (en) | 2019-03-13 | 2019-03-13 | Soil permeability coefficient testing device and testing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109900615B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112033498A (en) * | 2020-08-14 | 2020-12-04 | 合肥国轩高科动力能源有限公司 | Method for detecting liquid injection efficiency of lithium ion battery |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007198027A (en) * | 2006-01-27 | 2007-08-09 | Jdc Corp | In-situ permeability testing method and device |
| JP2009008513A (en) * | 2007-06-27 | 2009-01-15 | Kajima Corp | Water permeability test device and water permeability test method |
| CN201965073U (en) * | 2010-12-03 | 2011-09-07 | 安徽理工大学 | Comprehensive experimental device for testing permeability coefficient, water yield and water storage coefficient |
| CN202330232U (en) * | 2011-11-15 | 2012-07-11 | 山东大学 | Device for testing permeability coefficient of pervious concrete |
| CN203858186U (en) * | 2014-04-29 | 2014-10-01 | 长安大学 | Soil permeability coefficient determinator |
| CN104819920A (en) * | 2015-03-24 | 2015-08-05 | 河南理工大学 | Varying-head permeability experiment apparatus for indoor freezing and thawing equipment |
| CN105588796A (en) * | 2015-12-17 | 2016-05-18 | 扬州大学 | Device for accurately and rapidly determining permeability coefficient of soil |
| CN106546526A (en) * | 2016-11-25 | 2017-03-29 | 太原理工大学 | Multidimensional gas permeability measurement instrument and measuring method |
| CN206161487U (en) * | 2016-09-21 | 2017-05-10 | 镇江市建科工程质量检测中心有限公司 | Survey device of concrete osmotic coefficient |
| CN106814017A (en) * | 2017-01-18 | 2017-06-09 | 浙江科技学院（浙江中德科技促进中心） | Nano sol reinforces the permeability and modulus at rapid deformation relation test device and method of sand |
| CN108061696A (en) * | 2017-11-29 | 2018-05-22 | 河海大学 | A kind of device and method of indoor test mud film infiltration coefficient |
| CN108387497A (en) * | 2018-01-26 | 2018-08-10 | 黑龙江省水利科学研究院 | A kind of bentonite waterproof blanket osmotic coefficient investigating method |
| CN108519317A (en) * | 2018-04-24 | 2018-09-11 | 钦州学院 | Rock stress-seepage coupling test device under uniaxial direct tensile load |
| CN108760599A (en) * | 2018-05-16 | 2018-11-06 | 河海大学 | A kind of simulating measuring device |
| CN109406367A (en) * | 2018-12-06 | 2019-03-01 | 中国科学院武汉岩土力学研究所 | A kind of geotextiles silting and permeability simulation experimental device |
| CN210037543U (en) * | 2019-03-13 | 2020-02-07 | 镇江市建设工程质量检测中心有限公司 | Soil permeability coefficient testing device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8229672B2 (en) * | 2008-09-24 | 2012-07-24 | Brian Lee Prigge | Percolation test apparatus |
-
2019
- 2019-03-13 CN CN201910190000.5A patent/CN109900615B/en active Active
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007198027A (en) * | 2006-01-27 | 2007-08-09 | Jdc Corp | In-situ permeability testing method and device |
| JP2009008513A (en) * | 2007-06-27 | 2009-01-15 | Kajima Corp | Water permeability test device and water permeability test method |
| CN201965073U (en) * | 2010-12-03 | 2011-09-07 | 安徽理工大学 | Comprehensive experimental device for testing permeability coefficient, water yield and water storage coefficient |
| CN202330232U (en) * | 2011-11-15 | 2012-07-11 | 山东大学 | Device for testing permeability coefficient of pervious concrete |
| CN203858186U (en) * | 2014-04-29 | 2014-10-01 | 长安大学 | Soil permeability coefficient determinator |
| CN104819920A (en) * | 2015-03-24 | 2015-08-05 | 河南理工大学 | Varying-head permeability experiment apparatus for indoor freezing and thawing equipment |
| CN105588796A (en) * | 2015-12-17 | 2016-05-18 | 扬州大学 | Device for accurately and rapidly determining permeability coefficient of soil |
| CN206161487U (en) * | 2016-09-21 | 2017-05-10 | 镇江市建科工程质量检测中心有限公司 | Survey device of concrete osmotic coefficient |
| CN106546526A (en) * | 2016-11-25 | 2017-03-29 | 太原理工大学 | Multidimensional gas permeability measurement instrument and measuring method |
| CN106814017A (en) * | 2017-01-18 | 2017-06-09 | 浙江科技学院（浙江中德科技促进中心） | Nano sol reinforces the permeability and modulus at rapid deformation relation test device and method of sand |
| CN108061696A (en) * | 2017-11-29 | 2018-05-22 | 河海大学 | A kind of device and method of indoor test mud film infiltration coefficient |
| CN108387497A (en) * | 2018-01-26 | 2018-08-10 | 黑龙江省水利科学研究院 | A kind of bentonite waterproof blanket osmotic coefficient investigating method |
| CN108519317A (en) * | 2018-04-24 | 2018-09-11 | 钦州学院 | Rock stress-seepage coupling test device under uniaxial direct tensile load |
| CN108760599A (en) * | 2018-05-16 | 2018-11-06 | 河海大学 | A kind of simulating measuring device |
| CN109406367A (en) * | 2018-12-06 | 2019-03-01 | 中国科学院武汉岩土力学研究所 | A kind of geotextiles silting and permeability simulation experimental device |
| CN210037543U (en) * | 2019-03-13 | 2020-02-07 | 镇江市建设工程质量检测中心有限公司 | Soil permeability coefficient testing device |
Non-Patent Citations (2)
| Title |
|---|
| Gunther D,et al.Government-industry collaboration on aviation safety data analysis and sharing.《Annual international air safety seminar》.2008,第1卷第443-456页. * |
| 土的不同渗透试验方法应用与研究;刘小龙;《勘察科学技术》;20110630(第03期);第36-39页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109900615A (en) | 2019-06-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104677803B (en) | Often, varying head is combined pervasion test device | |
| CN105588796B (en) | A kind of device of accurate quick measure soil permeability coefficient | |
| US10823720B2 (en) | Deep soil water percolation monitor and monitoring method therefor | |
| CN201130143Y (en) | Porous medium material permeability coefficient determinator | |
| CN102620998B (en) | Device and method for pressure test and drainage tests for waved pipeline | |
| CN106370580B (en) | Quick penetration test device suitable for low-permeability medium | |
| CN108332816B (en) | Device and method for measuring exchange water quantity of surface water and underground water of river channel | |
| CN203824621U (en) | Device for detecting and testing nested static force water level balanced type measuring weir water gauge | |
| CN104316144B (en) | A kind of visualization measurement method of level of ground water under condition of negative pressure | |
| CN104533407A (en) | Underground state determination method and device and state control method and device | |
| CN109900615B (en) | Soil permeability coefficient testing device and testing method thereof | |
| CN210037543U (en) | Soil permeability coefficient testing device | |
| CN204649589U (en) | A kind of undisturbed soil sample osmotic coefficient investigating device | |
| CN105649603A (en) | Method for measuring accumulated liquid quantity of well bore of gas well in real time | |
| CN108240958B (en) | Asphalt pavement water seepage instrument under action of moving water and application method thereof | |
| CN106568699A (en) | Test device and method for testing laminar flow characteristics of asphalt pavement | |
| CN104897544B (en) | The vaporization prevention type double-ring infiltration instrument for being easily installed and fixing | |
| CN210604310U (en) | Road compactness test detection device | |
| KR20100008201A (en) | Apparatus for detecting liquid level and method of detecting liquid level using the same | |
| CN111122418A (en) | Concrete permeability measuring device and method capable of controlling flow | |
| CN109580370A (en) | A kind of test device and its application method for soil test | |
| CN207470190U (en) | It simulates slurry shield excavation face mud film forming and measures the device of mud film infiltration coefficient | |
| CN115897491A (en) | Embedded pipe earth-rock dam diaphragm wall structure and defect detection and repair method | |
| CN210347405U (en) | Double-cylinder constant water head testing device | |
| CN114739888A (en) | Permeation test device and method for pervious concrete in various shapes |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |