CN218239743U - Test device for measuring soil permeability coefficient - Google Patents
Test device for measuring soil permeability coefficient Download PDFInfo
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- CN218239743U CN218239743U CN202221776692.5U CN202221776692U CN218239743U CN 218239743 U CN218239743 U CN 218239743U CN 202221776692 U CN202221776692 U CN 202221776692U CN 218239743 U CN218239743 U CN 218239743U
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Abstract
The utility model relates to an earthwork technical field, concretely relates to survey soil permeability coefficient's test device. The method comprises the following steps: the device comprises sample tubes, a base, a first connecting pipe and a second connecting pipe, wherein the sample tubes are vertically arranged, a sample area for accommodating sample soil is formed in the sample tubes, an upper plug is installed at the upper end of the sample area, and a lower plug is installed at the lower end of the sample area; the liquid supply mechanism comprises a water pump and a first pressure gauge, a water outlet of the water pump is communicated with the lower plug, and the first pressure gauge is arranged at the lower plug and used for detecting the water pressure entering the sample tube; the liquid collecting mechanism comprises a liquid collecting bottle and a liquid collecting pipe, wherein one end of the liquid collecting pipe is communicated with the other end of the upper plug, and the other end of the liquid collecting pipe is communicated with the liquid collecting bottle. The utility model discloses from up water delivery down, realize the poor regulation of experimental pipe both ends flood peak through water pump and first pressure gauge, adjust the poor structure of flood peak for the tradition through the height of adjusting the upper portion liquid level, it is convenient accurate more. In addition, the device is not a large-scale device, is convenient to sample, is convenient to use in different scenes, can measure the permeability coefficient of the soil body at a specific position under different projects, and has stronger applicability.
Description
Technical Field
The utility model relates to an earthwork technical field, concretely relates to survey soil permeability coefficient's test device.
Background
The permeability coefficient is an index comprehensively reflecting the permeability of the soil body, reflects the flow characteristics of the fluid in the pores of the soil body, and the correct numerical value of the permeability coefficient has very important significance for the permeability calculation in the technologies such as civil construction and the like.
The existing soil permeability coefficient measuring method comprises a laboratory test and a field test, generally, the permeation is carried out by injecting water from top to bottom, and the adjustment of the water head difference at two ends can only be realized by adjusting the height of the upper liquid level in the mode, so that the operation is inconvenient.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming the soil permeability coefficient among the prior art and measuring the poor defect of adjusting the inconvenient operation of both ends flood peak.
In order to solve the problems, the utility model provides a test device for measuring soil permeability coefficient, which comprises a sample tube, a liquid supply mechanism and a liquid collection mechanism, wherein the sample tube is vertically arranged and a sample area suitable for containing sample soil is formed in the sample tube, the upper end of the sample tube is provided with an upper plug, and the lower end of the sample tube is provided with a lower plug; the liquid supply mechanism comprises a water pump and a first pressure gauge, the water outlet end of the water pump is communicated with the sample area through the lower plug, and the first pressure gauge is installed at the lower plug and is suitable for detecting the pressure of liquid entering the sample pipe; the liquid collecting mechanism comprises a liquid collecting bottle and a liquid collecting pipe, and one end of the liquid collecting pipe is connected with the upper plug through the sample area and the other end of the sample area is communicated with the liquid collecting bottle.
Optionally, the test device for determining the permeability coefficient of soil further comprises: and the second pressure gauge is arranged at the upper plug of the sample tube and is suitable for detecting the pressure of the liquid flowing out of the sample tube.
Optionally, the test device for determining the permeability coefficient of soil further comprises: the monitor is arranged at the liquid collecting mechanism and is suitable for monitoring the temperature and the flow of liquid in the liquid collecting process.
Optionally, the test device for determining the permeability coefficient of soil further comprises: and the liquid storage bottle is communicated with the water inlet end of the water pump.
Optionally, the liquid storage bottle and the liquid collecting bottle are shared to form liquid circulation.
Optionally, a water distribution body is arranged between the upper plug and the sample area and/or between the lower plug and the sample area, the water distribution body is of a hard granular structure, and the water distribution body is suitable for enabling input liquid to be uniform and supporting soil.
Optionally, the water distributor is glass beads with the diameter of 2mm-4 mm.
Optionally, a partition is arranged between the water distribution body and the sample area, and the partition is suitable for blocking the mixture of the sample soil and the water distribution body and allowing the liquid to circulate.
Optionally, a sampling port is arranged on the side wall of the sample tube, and the sampling port is suitable for liquid sampling and soil sampling.
The utility model has the advantages of it is following:
1. the utility model provides a test device of survey soil permeability coefficient, supply liquid mechanism to set up water pump and first pressure gauge, the water pump is from up annotating the liquid to the sample tube down, utilize certain lift to make liquid have ascending energy, first pressure gauge detects sample tube lower extreme water inlet pressure, infusion pressure through first pressure gauge feedback regulation water pump, thereby realize the regulation of test tube both ends flood peak difference, adjust the poor structure of flood peak for the height of tradition through adjusting the upper portion liquid level, it is convenient accurate more to adjust. In addition, the device is not large-scale test equipment, is convenient to sample, is convenient to use in different scenes, can measure the permeability coefficient of the soil body at a certain specific position under different projects, and has stronger applicability.
2. The utility model provides a survey test device of soil permeability coefficient still is equipped with the second pressure gauge in last end cap department, and the second pressure gauge can detect the fluid pressure of outflow test pipe, cooperates first pressure gauge, can pass through the regulation of water pump output pressure, and accurate control test pipe both ends flood peak is poor, has avoided only relying on in the test process to improve upper portion liquid level, changes the single mode that the total flood peak in both ends is poor about the change. By utilizing a reverse circulation mode, on the basis of controlling the height of the liquid level, the pressure head of the liquid level at the lower part of the soil body is controlled, and the pressure value of the liquid level at the upper part of the soil body is measured, so that the total head difference at the upper end and the lower end of various soil bodies can be more conveniently regulated and controlled, and the permeability coefficients of different types of soil can be more quickly and accurately measured.
3. The utility model provides a survey soil permeability coefficient's test device sets up the monitor in collection liquid mechanism department, can accurate measurement get into the liquid flow and the temperature of collection liquid bottle, monitors temperature and pressure stability simultaneously, guarantees to use the device survey soil permeability coefficient data accuracy.
4. The utility model provides a survey soil osmotic coefficient's test device is equipped with the stock solution bottle, and the water pump can be followed and extracted liquid in the stock solution bottle during the use, need not close on the water source and detect to the region suitability of this device has been improved.
5. The utility model provides a survey soil permeability coefficient's test device, stock solution bottle and liquid collection bottle sharing can reduce the instrument, retrencies the structure, and the liquid of collecting simultaneously can repeatedly carry out the infiltration experiment, has also saved the consumption of liquid.
6. The utility model provides a survey soil permeability coefficient's test device, the water body of cloth is established to the sample tube lower extreme for liquid fully gets into the sample tube plane, the even support soil body that just can be better of water distribution.
7. The utility model provides a test device of survey soil permeability coefficient has set up between the water distribution body and the sample soil and has separated the piece, avoids sample soil and the mixing of the water distribution body, cuts off the piece simultaneously and can evenly permeate water, strengthens the effect of even water delivery.
8. The utility model provides a survey soil permeability's test device sets up a plurality of evenly distributed's sample connection on the sample pipe lateral wall, carries out sample soil sample and liquid sample, detects sample pipe device stability and gas tightness constantly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is the structure schematic diagram of the test device for measuring the soil permeability coefficient of the utility model.
Fig. 2 is a schematic diagram and an explosion diagram of the water distributing body part of the utility model.
Description of the reference numerals:
1. a sample tube; 11. an upper plug; 12. a lower plug; 21. a water pump; 22. a first pressure gauge; 20. a liquid storage bottle; 31. a liquid collecting bottle; 32. a liquid collecting pipe; 4. a second pressure gauge; 5. a monitor; 6. distributing water; 7. a sampling port; 8. a spacer; 100. and (6) testing sample soil.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, the technical features mentioned in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
Examples
Referring to fig. 1, the test apparatus for determining the permeability coefficient of soil provided in this embodiment includes:
the device comprises a sample tube 1 which is vertically arranged, a sample area suitable for containing sample soil 100 is formed in the sample tube, an upper plug 11 is installed at the upper end of the sample area, and a lower plug 12 is installed at the lower end of the sample area;
the liquid supply mechanism comprises a water pump 21 and a first pressure gauge 22, the water outlet end of the water pump 21 is connected with the lower plug 12, and the first pressure gauge 22 is installed at the lower plug 12 and is suitable for detecting the pressure of liquid entering the sample tube 1;
the liquid collecting mechanism comprises a liquid collecting bottle 31 and a liquid collecting pipe 32, one end of the liquid collecting pipe 32 is communicated with the upper plug 11, and the other end of the liquid collecting pipe is communicated with the liquid collecting bottle 31.
Specifically, the shape of the sample tube 1 is not limited, and can be a round tube or a square tube, and the requirements that the radial length is moderate, the sectional area is moderate, when the section is too large, an internal soil sample is sufficient, the required water amount is large, the requirement on the water amount is high, and the long permeation process is not favorable for the rapid measurement of experimental results are met; too small a cross-section is not conducive to soil compaction and the infiltration process is not representative. Certainly, the inner wall of the sample tube 1 should be smooth, so that soil can conveniently enter, as shown in fig. 1, an upper plug 11 and a lower plug 12 are respectively arranged, so that the sample soil 100 is ensured to be fixed in the sample tube 1, the upper plug 11 and the lower plug 12 both have an abutting effect, the device is stable, and the regional applicability is strong; the material of the sample tube 1 is not particularly limited, and may be metal, or may be other materials such as plastic, as long as they have a certain hardness and are impermeable to water.
Specifically, water pump 21 sets up in sample pipe 1 below, export end cap 12 department under the sample pipe 1 with liquid, lower end cap 12 trompil is connected with water pump 21, utilize water pump 21 output liquid ascending pressurized-water lift, first pressure gauge 22 sets up end cap 12 trompil department under, detect inlet pressure, further feedback control water pump's infusion pressure, realize the regulation of test tube both ends head difference, it is more convenient accurate to adjust, the experimentation data is accurate, water pump and pressure gauge select common product in the market can.
Specifically, the liquid collecting bottle 31 is not limited in material, and may be made of glass, metal or any other material, and the shape is not limited as long as enough liquid can be stored for the test; the liquid collecting pipe 32 is connected with the opening of the upper plug 11, and the joint is sealed to prevent liquid leakage.
The soil type to be measured can be various types of soil with loose soil texture or surface weathered silicate minerals and the like, and the permeability coefficient of the soil can be measured through the test device. In this embodiment, the liquid is water.
Furthermore, a second pressure gauge 4 is arranged at an upper end plug 11 at the upper end of the sample tube 1 to detect the liquid outflow pressure of the sample tube 1, the second pressure gauge 4 can be selected to be the same as or different from the first pressure gauge 22, and double pressure gauges are adopted to detect the pressure of the water inlet end and the water outlet end, so that the problem that the water head difference of the water inlet end and the water outlet end of the sample tube is accurately measured by only improving the height of the liquid level at the upper part and changing the single mode of the total water head difference at the upper end and the lower end in the test process is avoided, and the data is accurate and reliable.
Further, as an implementation manner, in this embodiment, as shown in fig. 1, a monitor 5 is disposed at the liquid collecting mechanism, the monitor 5 should include a flow monitoring module and a temperature monitoring module, and may select a common product on the market, the flow monitoring module detects the amount of water flowing into the liquid collecting bottle 31 from the sample tube 1, the temperature monitoring module monitors the temperature of the liquid in the testing process, so as to find out the dynamic viscosity coefficient of the water at the corresponding temperature, the monitor 5 is adapted to monitor the liquid flow and temperature in the liquid collecting process, and the testing process is stable and controllable.
As another embodiment, in order to detect the liquid flow rate and the test temperature, a separate flow rate monitor and a thermometer may be provided at the liquid collecting mechanism to detect the flow rate and the temperature, respectively. The thermometer can be selected from various types commonly available in the market, and mainly the thermometer can be used for detecting the ambient temperature or the liquid temperature.
Further, a liquid storage bottle 20 is arranged at the water inlet end of the water pump 21 to provide liquid for the test device for measuring the soil permeability coefficient, in the embodiment, as shown in fig. 1, the liquid storage bottle 20 and the liquid collection bottle 31 are shared, the liquid in the bottle body is input into the sample tube 1 from the lower end of the sample tube 1 through the water pump 21 to carry out a soil permeability test, the liquid seeps out through the upper end of the sample tube 1 after being fully permeated, and returns to the bottle body through the liquid collection tube 32 to form liquid circulation, so that the test device is reduced, the structure is simplified, meanwhile, the collected liquid can be repeatedly subjected to the permeability test, the consumption of the liquid is also saved, and the test device is convenient to move when a test scene is changed.
Of course, as another embodiment, two bottle bodies may be provided, and scales may be provided on the side wall of the liquid collecting bottle 31 to detect the amount of liquid flowing into the liquid collecting bottle 31, and the liquid storing bottle 20 is not required, but other liquid storing structures may be selected.
Further, in the present embodiment, as shown in fig. 2, a water distributing body 6 is disposed at the bottom end inside the sample tube 1, and the water distributing body 6 is a hard structure. It should be noted that the particle size of the water distributor 6 should be larger than the particle size of the sample soil 100. The glass beads with the diameter of 2mm-4mm are arranged in the embodiment, so that the detection requirement of common soil bodies can be met, the materials are easy to obtain, the cost is low, the surface is smooth, the water permeating effect is good, and other materials or structures can be selected as long as the requirements of uniform infusion and soil body supporting are met. Specifically, the diameter of the glass beads may be 2mm or 3mm or 4mm.
Further, in this embodiment, as shown in fig. 2, a partition 8 is disposed between the water distributor 6 and the sample soil 100 to block the mixture of the sample soil 100 and the water distributor 6 and allow the liquid to flow through, in this embodiment, gauze is selected, which is easy to find and cheap in material, and other materials may be selected as long as it has a certain solid blocking effect and allows the liquid to flow through.
Further, as shown in fig. 1, the sidewall of the sample tube 1 of this embodiment is provided with a plurality of sampling ports 7, so that liquid sampling and soil sampling are performed during the test process, and the stability and the sealing performance of the device are ensured.
The soil permeability coefficient measurement using the soil permeability coefficient test apparatus described in this example was carried out as follows:
s1, digging a test pit with the area more than or equal to 1.0m x 1.5m in a soil body to be sampled planned in a sampling area according to a preset depth, and leveling the test pit.
S2, paving gravel layers with the thickness of 2cm on the soil body at the bottom of the test pit to prevent the soil body from being corroded.
S3, the sample tube 1 is stably placed, the placing speed is not less than 0.1m/S, the placing depth is controlled to be 90% of the total length of the sample tube 1, the bottom of a hole cannot be impacted, the soil of the placed part is fixed inside the sample tube 1, the integrity of the soil in the sample tube 1 in the placing process is kept, and the sample tube 1 and the sample soil 100 taken out of the tube are taken out.
And S4, injecting water into the sample pipe 1 through the liquid supply mechanism until the flow is stable, reading values through the flow monitoring system and the pressure monitoring system, and accurately and quickly measuring the soil permeability coefficient on the basis of Darcy' S law.
And S5, simultaneously, water sampling or soil sampling can be carried out through the sampling port 7 in the test process, the stability of the device in the test process is monitored, the accuracy and reliability of the measured and recorded data are ensured, and a novel mode is provided for the measurement of the field permeability coefficient.
The permeability coefficient was calculated according to the following formula:
H′＝H p1 -H p2 -L
in the formula:
q-flow (cm) 3 /s)
V-amount of water (cm) entering the liquid collecting bottle 31 in a period of time after the flow of water is stabilized 3 )
t-a period of time after the flow has stabilized(s)
H' -device upper and lower ends total head difference (cm)
H p1 Head (cm) of pressure measured at the lower part of the device
H p2 Head (cm) of pressure measured at the upper part of the device
L-length of soil body in the device (cm)
i-hydraulic slope
K T Permeability coefficient of the soil at T ℃ (cm/s)
A-inside cross-sectional area (cm) of the apparatus 2 )
K 20 Permeability coefficient (cm/s) of the soil at 20 ℃
η T 、η 20 The dynamic viscosity coefficients of water at T ℃ and 20 ℃ respectively, and the correlation can be obtained by referring to 'geotechnical test method Standard' table 8.3.5-1.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications derived therefrom are intended to be within the scope of the invention.
Claims (9)
1. A test device for determining soil permeability coefficient, comprising:
the device comprises a sample tube (1), a lower plug (12) and a lower plug (11), wherein the sample tube (1) is vertically arranged, a sample area suitable for containing sample soil (100) is formed in the sample tube, and the upper end of the sample tube (1) is provided with the upper plug (11) and the lower end of the sample tube is provided with the lower plug (12);
a liquid supply mechanism comprising a water pump (21) and a first pressure gauge (22), wherein the water outlet end of the water pump (21) is communicated with the sample area through the lower plug (12), and the first pressure gauge (22) is installed at the lower plug (12) and is suitable for detecting the pressure of liquid entering the sample tube (1);
the liquid collecting mechanism comprises a liquid collecting bottle (31) and a liquid collecting pipe (32), one end of the liquid collecting pipe (32) is communicated with the sample area through the upper plug (11), and the other end of the liquid collecting pipe is communicated with the liquid collecting bottle (31).
2. The test device for determining the permeability coefficient of soil according to claim 1, further comprising:
a second pressure gauge (4) arranged at the upper stopper (11) and adapted to detect the pressure of the liquid flowing out of the sample tube (1).
3. The test device for determining the permeability coefficient of soil according to claim 1, further comprising:
and the monitor (5) is arranged at the liquid collecting mechanism and is suitable for monitoring the temperature and the flow of the liquid in the liquid collecting process.
4. The test device for determining soil permeability coefficient of claim 1, wherein the liquid supply mechanism further comprises:
and the liquid storage bottle (20) is communicated with the water inlet end of the water pump (21).
5. The test device for measuring soil permeability coefficient according to claim 4, wherein the liquid storage bottle (20) and the liquid collection bottle (31) are shared to form a liquid circulation.
6. The test device for measuring the soil permeability coefficient according to claim 1, wherein a water distribution body (6) is arranged between the upper plug (11) and the sample area and/or between the lower plug (12) and the sample area, the water distribution body (6) is of a hard granular structure, and the water distribution body (6) is suitable for enabling the input liquid to be uniform and supporting the soil mass.
7. The test device for measuring the permeability coefficient of soil according to claim 6, wherein the water distribution body (6) is glass beads with the diameter of 2mm-4 mm.
8. The test device for determining the permeability coefficient of soil according to claim 6 or 7, characterized in that a partition (8) is arranged between the water distribution body (6) and the sample area, wherein the partition (8) is adapted to block the sample soil (100) from mixing with the water distribution body (6) and allow liquid to flow through.
9. The test device for determining the permeability coefficient of soil according to any one of claims 1 to 7, wherein the sidewall of the sample tube (1) is provided with a sampling port (7), and the sampling port (7) is suitable for liquid sampling and soil sampling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221776692.5U CN218239743U (en) | 2022-07-11 | 2022-07-11 | Test device for measuring soil permeability coefficient |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221776692.5U CN218239743U (en) | 2022-07-11 | 2022-07-11 | Test device for measuring soil permeability coefficient |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115235972A (en) * | 2022-07-11 | 2022-10-25 | 北京市地质灾害防治研究所 | Detection method for soil permeability coefficient |
| CN117589525A (en) * | 2024-01-19 | 2024-02-23 | 河海大学 | A regularly quantitative collection device for soil infiltration |
-
2022
- 2022-07-11 CN CN202221776692.5U patent/CN218239743U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115235972A (en) * | 2022-07-11 | 2022-10-25 | 北京市地质灾害防治研究所 | Detection method for soil permeability coefficient |
| CN117589525A (en) * | 2024-01-19 | 2024-02-23 | 河海大学 | A regularly quantitative collection device for soil infiltration |
| CN117589525B (en) * | 2024-01-19 | 2024-03-19 | 河海大学 | A regularly quantitative collection device for soil infiltration |
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