CN216082294U - Soil body tester based on soil body elasticity test - Google Patents
Soil body tester based on soil body elasticity test Download PDFInfo
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- CN216082294U CN216082294U CN202120626279.XU CN202120626279U CN216082294U CN 216082294 U CN216082294 U CN 216082294U CN 202120626279 U CN202120626279 U CN 202120626279U CN 216082294 U CN216082294 U CN 216082294U
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Abstract
The utility model discloses a soil body tester based on soil body elasticity test, which comprises a measuring cabin, a measuring device and a control device, wherein the measuring cabin is used for placing a test sample soil block for test, is a sealed cavity and is internally provided with an extrusion device for extruding the sample soil block; the elasticity monitoring system comprises a detection member connected and arranged on the sample soil block and is used for monitoring the elasticity modulus of the sample soil block in real time when the sample soil block is extruded; and the humidity generating device is arranged outside the test cabin and communicated with the test cabin, can input dry gas or moisture into the measurement cabin, and is used for changing the temperature or humidity in the measurement cabin so as to enable the body structure of the sample soil block to be changed in accordance with the temperature or humidity in the measurement cabin. Can be widely applied to the technical field of geotechnical engineering.
Description
Technical Field
The utility model relates to the technical field of geotechnical engineering. More specifically, the present invention relates to a soil tester based on soil elasticity test.
Background
Along with the rapid improvement of advanced test equipment and the development of computer programming language, the elastic behavior of the soil body is increasingly emphasized by people, the elastic modulus of the soil body is one of important indexes for reflecting the strength of the soil body, the change of the elastic modulus reflects the change of the stress state in the soil body, and the elastic modulus is a mechanical property index of the soil necessary for calculating the stress strain of the soil body by adopting an elastic-plastic constitutive model. However, since the soil itself is a heterogeneous body, the acquisition of the elastic modulus of the soil is susceptible to the environment surrounding the test, such as: moisture in the air influences the moisture content of the soil body, the temperature of the test surrounding environment influences the evaporation of the soil body moisture and the like, and the conventional means is difficult to use, so that the result that the elastic modulus of the soil body is inaccurate is obtained. Therefore, when measuring the elastic modulus of the soil body, the method is very important for analyzing the same test piece, and plays a role in continuous experiment and time saving.
In the traditional method and instrument, the measurement means is too complex, the sensitivity of the single-arm bridge for measuring current is low, the temperature compensation function is not provided, and the precision of the galvanometer is not high, which can seriously affect the accuracy of the measurement result. Therefore, in the prior art, a miniaturized soil body tester is lacked, the problems that people can obtain different elastic moduli through taking soil bodies at different relative humidity in the past and take more time for repeated experiments due to more samples can be effectively solved, and the purpose of measuring the elastic modulus of the same soil block under different relative humidity is realized.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a soil body tester based on soil body elasticity test.
In order to achieve these objects and other advantages in accordance with the present invention, there is provided a soil testing apparatus based on soil elasticity test, the soil testing apparatus comprising a measuring chamber for placing a test sample soil block, the measuring chamber being a sealed cavity in which an extruding device for extruding the sample soil block is disposed;
the elasticity monitoring system comprises a detection member connected and arranged on the sample soil block and is used for monitoring the elasticity modulus of the sample soil block in real time when the sample soil block is extruded;
humidity generating device sets up the test chamber is outside and intercommunication the test chamber, humidity generating device can to measure the interior dry gas or the moisture of input of under-deck, be used for changing measure the temperature or the humidity in the under-deck, so that the body structure of sample soil block take place with measure the unanimous change of the inside temperature of under-deck or humidity.
Preferably, the detection member is a plurality of strain gauges, and at least one pair of strain gauges is relatively attached to the side wall of the sample soil block and is used for detecting deformation information when the sample soil block is extruded;
the elasticity monitoring system further comprises: and the strain acquisition module is used for acquiring the deformation information and sending the deformation information to the PC terminal.
Preferably, the extrusion device includes, top stainless steel body and bottom stainless steel body, the two sets up relatively will including the sample clod centre gripping, just a pressure pole is connected to the upper end of top stainless steel body, the pressure pole is kept away from the one end of top stainless steel body is worn out the lateral wall of measuring the cabin and is connected a pressure test appearance, the bottom of bottom stainless steel body sets up a pressure sensing device.
Preferably, the measuring cabin comprises an upper device, a middle device and a lower device from top to bottom in sequence, the upper device and the lower device are in a groove shape and are oppositely arranged, notches of the upper device and the lower device are opposite, the middle device is in a flat plate shape, and two ends of the middle device are clamped between the upper device and the lower device;
the screw rod is connected with the upper device, the middle device and the lower device, and screw caps are arranged on the position sections of the upper device, the middle device and the lower device.
Preferably, the outer side wall of the measuring chamber is coated with a silica gel coating.
Preferably, the strain gauge is connected with the strain acquisition module through an interface of a MAX232DR model by a lead wire.
Preferably, the strain acquisition module is a MAX1452 strain acquisition module.
A test method of a soil body tester based on soil body elasticity test comprises the following steps:
step S1, preparing the sample soil block to obtain the sample soil block to be tested for the first time;
step S2, placing the sample soil block to be tested for the first time in the step S1 in the measuring cabin, and carrying out a first pressure test to obtain a first elastic modulus;
step S3, filling moisture or dry gas into the measuring cabin after the sample soil block is subjected to the primary pressure test in the step S2, and changing the humidity or temperature of the sample soil block to obtain the sample soil block to be tested for the second time;
and step S4, carrying out a second pressure test on the sample soil block to be tested for the second time in the step S3 to obtain a second elastic modulus, comparing the second elastic modulus with the first elastic modulus, and comparing whether the second elastic modulus and the first elastic modulus are changed or not to further obtain whether the change of the temperature or the humidity in the measuring cavity affects the same sample soil block or not.
Preferably, after the moisture or dry gas is input into the measurement chamber in the step S3, the periodic standing procedure is further performed, and the method of the utility model at least has the following advantages:
1. the utility model can measure the elastic modulus of the same soil block under different relative humidity, accords with the change of the soil body under the common natural condition, the sample soil block is placed in the measuring cabin and is extruded by the extruding device to deform the sample soil block, and the elasticity monitoring system is used for monitoring the elasticity modulus of the deformed sample soil block, then the humidity or the temperature in the measuring cavity is changed to further change the humidity or the temperature of the sample soil block, the sample soil block is continuously and repeatedly extruded for many times and the elastic modulus is monitored, further provides comprehensive test for soil body change with larger change under natural conditions, and simultaneously solves the problems in the prior art, the method has the advantages that the multiple sample soil blocks with different humidity are respectively subjected to extrusion test and the elastic modulus is respectively recorded, so that the test cost is high, the procedures are complicated, and the technical problem that the natural change of the same soil body under natural conditions is not met is solved.
2. The MAX1452 strain acquisition module can effectively avoid the error influence caused by low amplification factor of a traditional strain parameter acquisition instrument such as a bridge and low precision of a galvanometer, and has the advantages of completely independent power supply and work of each channel, more accurate and efficient acquired strain parameters and the like.
3. The humidity generating device communicated with the measuring cabin is arranged outside the measuring cabin, the humidity generating device can change the relative humidity of air in the measuring cabin, the humidity of the sample soil block can change along with the relative humidity of air in the measuring cabin, the accurate control of the temperature and the humidity in the measuring cabin is realized, and the temperature and the humidity in the measuring cabin can be calibrated.
Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model.
Drawings
FIG. 1 is a schematic structural diagram of a soil body tester based on soil body elasticity test according to the present invention;
the specification reference numbers indicate: 1. sample soil block, 2, strain gauge, 3, top stainless steel body, 4, bottom stainless steel body, 5, universal joint, 6, humidity generating device, 7, upper device, 8, middle device, 9, lower device, 10 screw rods, 11, screw caps, 12, pressure rods, 13, pressure sensors, 14, S-shaped stainless steel body, 15, bottom cylindrical stainless steel body, 16, lead wire, 17, PC end, 18, lead wire, 19, MAX1452 strain acquisition module, 20 and rubber sleeve.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the utility model by referring to the description text.
In the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1, the soil body tester based on soil body elasticity test comprises a measuring cabin, a measuring device and a control device, wherein the measuring cabin is used for placing a test sample soil block 1 for test, is a sealed cavity and is internally provided with an extrusion device for extruding the test sample soil block 1;
the elasticity monitoring system comprises a detection member connected and arranged on the sample soil block and is used for monitoring the elasticity modulus of the sample soil block 1 in real time when the sample soil block is extruded;
In the technical scheme, one sample soil block 1 is placed in a measuring cabin, the temperature and the humidity of the sample soil block 1 are changed by changing the temperature and the humidity in the measuring cabin, so that different forms of a soil body structure in a natural state are measured, and the problems that in the prior art, a plurality of experimental soil blocks with different humidity and temperature are subjected to repeated measuring tests and are compared in sequence, the workload is large, and the cost is high are avoided;
at first, prepare sample clod 1 that accords with the test condition earlier, the 1 size of sample clod that adapts to this device can refer to, and the diameter is 2 ~ 3cm, and thickness is about 8mm to and when sample clod 1 is placed in measuring the under-deck, the straightness that hangs down etc. of its surface smoothness, straightness, side all need according to: the upper surface and the lower surface of the sample soil block 1 should be parallel, the surface of the sample soil block 1 should be vertical to the central axis of the instrument, and the side surface of the sample soil block 1 should be parallel to the central axis of the instrument;
then, closing the measuring cabin, applying pressure to the direction of the pressure rod 12 through a pressure tester, and performing a first pressure test on the sample soil block 1, namely transmitting the pressure to the top stainless steel body 3 to enable the sample soil block 1 to be uniformly pressed, and when the pressure is applied, monitoring in real time through a spring plate of an elastic monitoring system, transmitting deformation information of the sample soil block 1 to the PC end 17, recording and storing the deformation information, and completing the first pressure test;
finally, carrying out the 1 st and the N th pressure tests on the sample soil block 1 subjected to the first pressure test, wherein N is more than 1; the method comprises the following steps: the humidity generating device 6 is utilized to fill moisture or dry gas into the measuring cabin, the temperature or the humidity in the measuring cabin is changed, the temperature or the humidity of the sample soil block in the measuring cabin is further changed, the Nth pressure test is carried out, then the pressure test results of each time are compared, and the elasticity modulus of the sample soil block 1 with different humidity is further judged according to the data change of the PC end 17.
Further, in each pressure experiment process, the loading rate of the pressure tester is 1MPa/min, the pressure is loaded to 7MPa and then unloaded to 3MPa, and the loading and unloading processes are repeated twice.
In another technical scheme, the detecting member is a plurality of strain gauges 2, and at least one pair of strain gauges 2 is oppositely attached to the side wall of the sample soil block 1 and used for detecting deformation information when the sample soil block is extruded;
the elasticity monitoring system further comprises: and the strain acquisition module 19 is used for acquiring the deformation information and sending the deformation information to the PC terminal 17.
In the above technical scheme, a plurality of strain gauges 2, and at least a pair of strain gauges 2 sets up the lateral wall at sample soil block 1 relatively to more accurate deformation parameter information who obtains the soil body, then transmit this information to PC end 17 through strain acquisition module 19, then calculate elastic modulus according to parameter information, elastic modulus's calculation mode is: the average value Δ ∈ of the strain of the two strain gages 2 from the time of loading to 7MPa and then unloading to 3MPa is calculated according to the elastic modulus calculation formula E ═ Δ σ/Δ ∈ where Δ σ ═ 4MPa, and then the average value of the elastic modulus calculation values of the two unloading stages is taken as the elastic modulus of the sample soil block 1.
In another technical scheme, the extrusion device comprises a top stainless steel body 3 and a bottom stainless steel body 4, the top stainless steel body 3 and the bottom stainless steel body 4 are oppositely arranged and are used for clamping the sample soil block 1, a pressure rod 12 is connected to the upper end of the top stainless steel body 3, one end, far away from the top stainless steel body 3, of the pressure rod 12 penetrates out of the side wall of the measuring cabin and is connected with a pressure tester, and a pressure sensing device is arranged at the bottom of the bottom stainless steel body 4.
In the technical scheme, the top stainless steel body 3 and the bottom stainless steel body 4 of the extrusion device are required to be set to be in a flat state suitable for the contact plane of the sample soil block 1, so that the subsequent extrusion and test precision is improved.
In another technical scheme, the measuring cabin sequentially comprises an upper device 7, a middle device 8 and a lower device 9 from top to bottom, the upper device 7 and the lower device 9 are in a groove shape and are oppositely arranged, notches of the upper device 7 and the lower device 9 are opposite, the middle device 8 is in a flat plate shape, and two ends of the middle device 8 are clamped between the upper device 7 and the lower device 9;
the device comprises an upper device 7, a middle device 8, a lower device 9, a pressure sensor, a vertical screw rod 10, a top stainless steel body 3, a pressure rod 12, a universal joint 5, an S-shaped stainless steel body 14 and a bottom cylindrical stainless steel body 15, wherein one of opposite ends of the upper device 7 and the middle device 8 is provided with extending parts protruding out of the bodies of the upper device 7 and the middle device 8, the extending parts of the upper device 7 and the middle device 8 are vertical and are connected to the lower device 9 in a penetrating mode from top to bottom through the vertical screw rod 10, the screw rod 10 is connected to position sections of the upper device 7, the middle device 8 and the lower device 9 and is provided with screw caps 11, the top stainless steel body 3 and the pressure rod 12 are connected and fixed through a rubber sleeve 20, the universal joint 5 for dismounting the regulator is arranged in the middle of the pressure sensor, and the S-shaped stainless steel body 14 and the bottom cylindrical stainless steel body 15 are arranged at the bottom of the pressure sensor and used for providing a rebound space when the pressure is too large and protecting upper components and devices.
In another technical scheme, the outer side wall of the measuring cabin is coated with a silica gel coating.
In the technical scheme, the silica gel coating is organic silica gel coating, and in order to guarantee the sealing performance of the measuring cabin, a layer of organic silica gel coating is coated on the outer side wall of the measuring cabin, so that the measuring cabin has a good effect of preventing air permeability and moisture permeability, the isolation of the measuring cabin from outside air is effectively guaranteed, and the accuracy of an experiment is guaranteed.
In another technical solution, the strain gauge 2 is connected to the strain acquisition module 19 through an interface of MAX232DR type by using a lead 16.
In another technical solution, the strain acquisition module 19 is a MAX1452 strain acquisition module 19 model.
In the above technical solution, the interface of the MAX232DR type is used for level conversion, so as to keep the area voltages of the strain gauge 2, the MAX1452 strain acquisition module 19 and the computer module consistent;
meanwhile, the MAX1452 strain acquisition module 19 has the advantages of few chips, small package, low power consumption, completely independent power supply and work of each channel, more accurate and efficient acquired strain parameters and the like, and the MAX1452 strain acquisition module 19 can effectively avoid error influence caused by low amplification factor of a traditional strain parameter acquisition instrument such as an electric bridge and low accuracy of a galvanometer.
Furthermore, the humidity generating device 6 preferably adopts a humidity generator EPOCH20147S, the EPOCH2017S humidity generator adopts a shunting principle, a temperature and humidity standard device and a control module are arranged in the humidity generating device, dry and wet air is generated in a full-automatic mode and is uniformly mixed in a measurement chamber controlled by constant temperature, the accurate control of the temperature and the humidity in the test chamber is realized, and the temperature and humidity measurement equipment can be calibrated.
The purpose of standing for a period of time is to make the sample soil block 1 fully absorb moisture in the air, so that the relative humidity of the sample soil block 1 is consistent with that in the measuring cabin, because the size of the sample soil block 1 is small, the permeability coefficient of the soil is large, and the sample soil block 1 can easily absorb moisture in the air.
A test method of a soil body tester based on soil body elasticity test comprises the following steps:
step S1, preparing the sample soil block 1 to obtain the sample soil block 1 to be tested for the first time;
step S2, placing the sample soil block 1 to be tested for the first time in the step S1 in the measuring cabin, and carrying out a first pressure test to obtain a first elastic modulus;
step S3, filling moisture or dry gas into the measuring cabin after the sample soil block 1 is subjected to the primary pressure test in the step S2, and changing the humidity or temperature of the sample soil block 1 to obtain the sample soil block 1 to be tested for the second time;
and step S4, carrying out a second pressure test on the sample soil block 1 to be tested for the second time in the step S3 to obtain a second elastic modulus, comparing the second elastic modulus with the first elastic modulus, and comparing whether the second elastic modulus and the first elastic modulus change or not to further obtain whether the change of the temperature or the humidity in the measuring cavity influences the same sample soil block or not.
In another technical solution, after the moisture or dry gas is input into the measurement chamber in step S3, a periodic standing process is further performed.
In the above technical solution, the purpose of the standing step is to make the sample soil block 1 fully absorb moisture in the air, so that the relative humidity of the sample soil block 1 is consistent with the relative humidity in the measurement chamber, because the size of the sample soil block 1 itself is relatively small, the permeability coefficient of the soil is relatively large, and the sample soil block 1 is relatively easy to absorb moisture in the air.
While embodiments of the utility model have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the utility model pertains, and further modifications may readily be made by those skilled in the art, it being understood that the utility model is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (7)
1. A soil body tester based on soil body elasticity test is characterized by comprising a measuring cabin, a measuring device and a control device, wherein the measuring cabin is used for placing a test sample soil block for testing, is a sealed cavity and is internally provided with an extrusion device for extruding the test sample soil block;
the elasticity monitoring system comprises a detection member connected and arranged on the sample soil block and is used for monitoring the elasticity modulus of the sample soil block in real time when the sample soil block is extruded;
the humidity generating device is arranged outside the measuring cabin and communicated with the measuring cabin, and dry gas or moisture can be input into the measuring cabin by the humidity generating device and used for changing the temperature or the humidity in the measuring cabin so as to enable the body structure of the sample soil block to be changed in accordance with the temperature or the humidity in the measuring cabin.
2. The soil mass tester based on the soil mass elasticity test of claim 1, wherein the detecting member is a plurality of strain gauges, at least one pair of the strain gauges is oppositely attached to the side wall of the sample soil block and is used for detecting the deformation information of the sample soil block when the sample soil block is extruded;
the elasticity monitoring system further comprises: and the strain acquisition module is used for acquiring the deformation information and sending the deformation information to the PC terminal.
3. The soil mass tester based on soil mass elasticity test of claim 1, wherein the squeezing device comprises a top stainless steel body and a bottom stainless steel body which are oppositely arranged to hold the sample soil block, the upper end of the top stainless steel body is connected with a pressure rod, one end of the pressure rod, which is far away from the top stainless steel body, penetrates through the side wall of the measuring chamber and is connected with a pressure tester, and the bottom of the bottom stainless steel body is provided with a pressure sensing device.
4. The soil mass tester based on soil mass elasticity test of claim 1, wherein the measuring cabin comprises an upper device, a middle device and a lower device from top to bottom in sequence, the upper device and the lower device are in the shape of grooves which are arranged oppositely, the notches of the upper device and the lower device are opposite, the middle device is in the shape of a flat plate, and two ends of the middle device are clamped between the upper device and the lower device;
the screw rod is connected with the upper device, the middle device and the lower device, and screw caps are arranged on the position sections of the upper device, the middle device and the lower device.
5. The soil mass tester based on soil mass elasticity test of claim 1, wherein the outside wall of the measuring chamber is coated with silica gel paint.
6. The soil elasticity test-based soil mass tester of claim 2, wherein the strain gauge is connected to the strain acquisition module by a wire through a MAX232DR type interface.
7. The soil mass tester based on soil mass elasticity test of claim 2, wherein the strain acquisition module is of a MAX1452 strain acquisition module type.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120626279.XU CN216082294U (en) | 2021-03-26 | 2021-03-26 | Soil body tester based on soil body elasticity test |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120626279.XU CN216082294U (en) | 2021-03-26 | 2021-03-26 | Soil body tester based on soil body elasticity test |
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| CN202120626279.XU Expired - Fee Related CN216082294U (en) | 2021-03-26 | 2021-03-26 | Soil body tester based on soil body elasticity test |
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