CN220584014U - Infiltration direct shear device of simulation clay wet and dry circulation - Google Patents
Infiltration direct shear device of simulation clay wet and dry circulation Download PDFInfo
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- CN220584014U CN220584014U CN202321854605.8U CN202321854605U CN220584014U CN 220584014 U CN220584014 U CN 220584014U CN 202321854605 U CN202321854605 U CN 202321854605U CN 220584014 U CN220584014 U CN 220584014U
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- 239000004927 clay Substances 0.000 title claims abstract description 31
- 230000008595 infiltration Effects 0.000 title claims description 4
- 238000001764 infiltration Methods 0.000 title claims description 4
- 238000004088 simulation Methods 0.000 title claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 87
- 238000010008 shearing Methods 0.000 claims abstract description 61
- 238000003825 pressing Methods 0.000 claims abstract description 19
- 230000035515 penetration Effects 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 230000035699 permeability Effects 0.000 claims abstract description 8
- 230000001105 regulatory effect Effects 0.000 claims description 17
- 239000008400 supply water Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 8
- 238000009736 wetting Methods 0.000 abstract description 6
- 239000002689 soil Substances 0.000 abstract description 4
- 230000002349 favourable effect Effects 0.000 abstract description 3
- 239000003673 groundwater Substances 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 24
- 229910052742 iron Inorganic materials 0.000 description 13
- 238000010586 diagram Methods 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229940099259 vaseline Drugs 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model relates to a permeation direct shear device for simulating clay dry-wet circulation, which comprises a sample box for filling a sample, a vertical pressing device, a water supply device, a shearing device and a detection device, wherein the vertical pressing device is used for applying pressure to the sample in the sample box; the water supply device is used for supplying water to the sample in the sample box so as to perform a penetration test; the shearing device is used for conducting a shearing test on the sample after the penetration test; the detection device is connected with the sample box and the shearing device and is used for detecting and obtaining the sample permeability coefficient in the permeability test and the sample shear strength in the shearing test. The clay wetting process based on the soil pressure and the groundwater level in actual engineering can be simulated, so that a penetration test and a shearing test can be carried out, and the penetration coefficient and the shearing strength of the sample can be respectively obtained through detection of the detection device. The method can sequentially perform a penetration test and a direct shear test on the same sample, and is favorable for subsequent analysis between the microstructure of the clay and the macroscopic property of the clay.
Description
Technical Field
The utility model relates to the technical field of constructional engineering equipment, in particular to a permeation direct shear device for simulating clay dry-wet circulation.
Background
Clay is a common building engineering material and tends to show different engineering properties under the actions of different ground stress environments, water environments and external forces. The interaction of water and soil is quite complex, and the law of influence of the evolution of the microstructure on the macroscopic engineering property is still unclear. Thus, there remains a need for a great deal of reliable dry-wet cycle test data support in engineering construction as well as in geological hazards.
At present, the wet and dry cycle test is always soaked and saturated in the wetting stage, and the wet stage test is directly exposed to the specified temperature and humidity environment after the wetting stage test is finished, and the moisture of the sample is evaporated to the specified moisture content. However, in practical engineering, the drying and wetting process of clay is still affected by the surrounding stress environment; when the underground water level gradually rises under the influence of precipitation and the like, the self-weight stress of the clay is changed while the clay is wetted; when the underground water level gradually drops under drought conditions, the hydraulic gradient suffered by clay gradually decreases, and finally the moisture of the clay gradually evaporates.
In addition, in practical engineering, in order to obtain permeability and shear strength data of a clay, two batches of samples are often required to be manufactured to perform a penetration test and a direct shear test respectively, which can repeat the workload of sample manufacturing. In addition, due to the characteristics of non-uniformity and discontinuity of clay samples, the microstructures of two batches of samples are likely to be inconsistent and cannot be completely used as parallel samples; it is likely to affect the analysis between the subsequent microstructure of the clay and the macroscopic properties of the clay.
At present, no penetrating direct shear device capable of simulating clay dry-wet circulation is available on the market.
Disclosure of Invention
Aiming at the problems existing in the prior art, the utility model aims at: the permeation direct shear device simulating clay dry-wet circulation can sequentially perform permeation tests and direct shear tests on the same sample, and is favorable for analysis between follow-up clay microstructures and clay macroscopic properties.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the infiltration direct shear device for simulating clay dry-wet circulation comprises a sample box for filling samples, a vertical pressing device, a water supply device, a shearing device and a detection device,
the vertical pressing device is arranged above the sample box and is used for applying pressure to the sample in the sample box;
the water supply device is connected with the sample box and is used for supplying water to the sample in the sample box so as to perform a penetration test;
the shearing device is arranged on one side of the sample box and is used for conducting a shearing test on the sample after the penetration test;
the detection device is connected with the sample box and the shearing device and is used for detecting and obtaining the sample permeability coefficient in the permeability test and the sample shear strength in the shearing test.
Further, the water supply device comprises an air cylinder and a water cylinder, wherein two ends of the water cylinder are respectively connected with the air cylinder and the sample box, and the water cylinder is pushed to supply water to the sample box by utilizing air pressure of the air cylinder.
Further, a water inlet ball valve is arranged on a connecting pipeline between the water tank and the sample box.
Further, the air cylinder is connected with an air compressor, and an electric proportional valve is arranged on a connecting pipeline between the air cylinder and the air compressor.
Further, a signal generator is arranged on the electric proportional valve.
Further, the vertical pressing device is a vertical pressure cylinder, and the air compressor is connected to the vertical pressure cylinder.
Further, the connecting pipeline between the air compressor and the vertical pressure cylinder and the connecting pipeline between the air compressor and the electric proportional valve are both provided with pressure regulating valves.
Further, a pressure cap for covering the sample is arranged above the sample box, and the pressure cap is used for uniformly distributing the pressure applied by the vertical pressing device on the surface of the sample.
Further, the sample box comprises an upper shearing box and a lower shearing box which are arranged correspondingly up and down; the middle part of the upper shearing box is vertically penetrated, the upper shearing box is detachably connected with the lower shearing box, the lower shearing box is lower than the sample, the vertical pressing device is abutted to the upper shearing box, the water supply device is connected with the lower shearing box, and the shearing device is transversely abutted to the lower shearing box.
Further, the shearing device comprises a motor controller, a motor driver and a stepping motor which are sequentially connected, and a motor shaft of the stepping motor is abutted to the lower shearing box.
In general, the utility model has the following advantages:
the vertical pressing device is used for applying pressure to the sample in the sample box, so that the soil pressure of clay in actual engineering can be simulated, the water supply device is used for supplying water to the sample in the sample box, and the process of wetting the clay by the groundwater level can be simulated for performing a penetration test; and then, carrying out a shearing test on the sample subjected to the penetration test by using a shearing device, and detecting by using a detection device to respectively obtain the penetration coefficient of the sample in the penetration test and the shear strength of the sample in the shearing test. The method can sequentially perform the penetration test and the direct shear test on the same sample, reduces the workload of sample preparation, does not influence the analysis result due to the characteristics of non-uniformity and discontinuity of the clay sample, and is favorable for the analysis between the follow-up clay microstructure and the clay macroscopic property.
Drawings
Fig. 1 is a schematic perspective view of the present embodiment.
Fig. 2 is a schematic diagram of the power unit of the present embodiment.
Fig. 3 is a schematic structural diagram of a shearing device according to the present embodiment.
Fig. 4 is a schematic structural view of the cartridge of the present embodiment.
Fig. 5 is a schematic view of the structure of the upper shear box of this embodiment.
Fig. 6 is a schematic structural diagram of the lower shear box of the present embodiment, where (a) in fig. 6 is a schematic structural diagram of the lower shear box of the present embodiment at a first viewing angle, (b) in fig. 6 is a schematic structural diagram of the lower shear box of the present embodiment at a second viewing angle, and (c) in fig. 6 is a schematic structural diagram of the lower shear box of the present embodiment connected with the exhaust switch.
Fig. 7 is a schematic structural diagram of a stand device according to the present embodiment.
FIG. 8 is a schematic diagram of water make-up for a water tank.
In the figure:
100-power device, 200-shearing device, 300-sample box and 400-bracket device;
a 101-air compressor; 102-a pressure regulating valve; 103-a pressure regulating valve; 104-an electrical proportional valve; 105-a signal generator; 106-cylinder, 107-water cylinder; 108-a vertical pressure cylinder; 109-iron ruler; 110-displacement meter; 111-a water inlet ball valve;
210-a motor controller; 220-motor driver; 230-a stepper motor; 240-a pressure sensor;
310-pressure cap; 320-upper shear box; 330-lower shear box;
321-upper screw holes; 322-upper water stop ring; 323-water outlet;
331-lower screw holes; 332-lower water stop ring; 333-a water inlet; 334-upper chute; 335-vent holes; 336-an exhaust switch;
410-upper rack; 420-iron rod; 430-a lower rack; 431-fixing an iron frame; 432-lower chute.
Detailed Description
The present utility model will be described in further detail below.
As shown in fig. 1, a penetrating direct shear device simulating clay dry-wet cycle comprises a power device 100, a shearing device 200, a sample box 300, a detection device, a bracket device 400 and the like.
The power device 100 provides vertical pressure applied to a sample to simulate soil pressure applied to clay in actual engineering, and provides water with a certain hydraulic gradient to simulate the process of wetting clay by groundwater level; the shearing device 200 shears the test specimen to test its shear strength; cartridge 300 is used to load a sample; the stand device 400 is used to connect and support the power device 100, the shearing device 200, and the cartridge 300.
As shown in fig. 2, the power unit 100 includes an air compressor 101, a vertical pressing unit, and a water supply unit.
In this embodiment, the vertical pressing means is a vertical pressure cylinder 108. The water supply device comprises an air cylinder 106 and a water cylinder 107; the two ends of the water cylinder 107 are respectively connected with the air cylinder 106 and the sample box 300, and are used for pushing the water cylinder 107 to supply water to the sample box 300 by the air pressure of the air cylinder 106.
The air compressor 101 is a common part of the type jsdkyj-01, and is operative to provide air pressure, and is connected to the vertical pressure cylinder 108 and the water cylinder 107 via air pipes, respectively.
The air compressor 101 is provided with a pressure regulating valve 102 on a pipeline connected with the vertical pressure cylinder 108, and the pressure regulating valve 102 is a universal part with the model of GFR200-08 and is used for regulating the air pressure of the vertical pressure cylinder 108 to the air pressure required by a test.
The air compressor 101 is provided with a pressure regulating valve 103 and an electric proportional valve 104 on a pipeline connected with a water cylinder 107, the electric proportional valve 104 is provided with a signal generator 105, the pressure regulating valve 103 is a universal part with the model of GFR200-08, and the pressure regulating valve 103 is used for regulating the air pressure to be not more than the maximum limit air pressure of the electric proportional valve 104.
The electric proportional valve 104 is a general part with the model of EPR2050-31G02NL series, is connected with the air cylinder 106 through an air pipe and is used for controlling the air pressure of the air cylinder 106 through a received voltage signal; the signal generator 105 is a generic part with the model number MIK502S, which can set parameters and output a voltage signal varying with waveforms, and the signal generator 105 used in this embodiment can generally output voltage signals with different waveforms such as sinusoidal waveforms, linear waveforms, and sawtooth waveforms.
The cylinder 106 and the water cylinder 107 are all universal parts with the model of MBB/MDBB32, wherein the water cylinder 107 is filled with water, the cylinder 106 is connected with the water cylinder 107 through a bolt, the water inlet 333 is connected with the sample box 300 through a water pipe, air pressure is supplied from the left side of the piston of the cylinder 106, and the air pressure can be converted into water pressure inside the water cylinder 107 through the piston of the cylinder 106, the bolt and the piston pushing the water cylinder 107. The water cylinder 107 is provided with a water inlet ball valve 111 on a pipeline connected with the sample box 300, and the water inlet ball valve 111 is a general part with the model number of Q11F-16P and is used as a switch to control water inlet of the sample box 300.
The detection means comprises a steel rule 109 on the vertical pressure cylinder 108, a displacement meter 110, a pressure sensor 240 on the shearing device 200, etc.
Specifically, the vertical pressure cylinder 108 is provided with an iron ruler 109 and a displacement meter 110, and is connected with the iron ruler 109 through bolts; the displacement meter 110 is a general-purpose component with the model of KTR-10, can be connected with a computer to record test data, and is used for measuring the vertical displacement of the iron ruler 109 in the test process.
As shown in fig. 3, the shearing apparatus 200 includes a motor controller 210, a motor driver 220, and a stepping motor 230, which are sequentially connected. The motor controller 210 is a generic part of model SM2P0908, which functions to send uniform pulse signals to the motor driver 220; the motor driver 220 is a general-purpose part of HD-B3C type, and functions to convert the uniform pulse signal from the motor controller 210 into a current signal required for the stepper motor 230; the stepper motor 230 is model MLA20, and in the case of no overload, the rotation speed and stop position of the stepper motor 230 only depend on the frequency and pulse number of the pulse signal emitted by the motor driver 220.
The motor shaft of the stepper motor 230 is abutted against the cartridge 300 by the pressure sensor 240. The pressure sensor 240 is a generic part of model HD-B3C, which can be connected to a computer to record test data.
As shown in fig. 4, the cartridge 300 includes a pressure cap 310, an upper shear box 320 and a lower shear box 330 disposed correspondingly up and down.
The middle of the upper shear box 320 is vertically penetrated, the upper shear box 320 is detachably connected to the lower shear box 330, the lower shear box 330 is lower than the sample height, the sample is filled in the lower shear box 330, and the sample height is higher than the lower shear box 330. The vertical pressure cylinder 108 is abutted against the upper shear box 320, the water cylinder 107 is connected to the lower shear box 330, and the motor shaft of the stepper motor 230 is transversely abutted against the lower shear box 330.
The pressure cap 310 is a circular iron plate, covering the sample, and is used to uniformly distribute the pressure of the vertical pressure cylinder 108 on the surface of the sample.
As shown in fig. 5, the upper shear box 320 is provided with four upper screw holes 321, an upper water stop ring 322, and a water outlet 323;
as shown in fig. 6, the lower shear box 330 is provided with four lower screw holes 331, a lower water stop ring 332, a water inlet 333, an upper chute 334, an exhaust hole 335, and an exhaust switch 336;
the four upper screw holes 321 of the upper shear box 320 correspond to the four lower screw holes 331 of the lower shear box 330, respectively, and the bolts can be inserted into the four screw holes, so that the alignment of the upper shear box 320 and the lower shear box 330 can be ensured, and sufficient pressure can be generated between the upper shear box 320 and the lower shear box 330 to prevent water leakage at the interface between the upper shear box 320 and the lower shear box 330.
The upper water-stop ring channel 322 is a circular concave, the lower water-stop ring channel 332 is also a circular concave, the concave of the upper water-stop ring channel 322 and the concave of the lower water-stop ring channel 332 can be filled with a sealing gasket made of silica gel, and the sealing gasket can be sealed under the action of a bolt to prevent the water leakage phenomenon in the first-stage test process.
The lower shear box 330 has two upper sliding grooves 334, the two upper sliding grooves 334 correspond to the two lower sliding grooves 432 of the bracket device 400, and steel balls are paved between the upper sliding grooves 334 and the lower sliding grooves 432. The exhaust hole 335 is connected to the exhaust switch 336 via a water pipe, and is used for exhausting gas in the cartridge 300 and the water pipe
As shown in fig. 7, the bracket device 400 includes an upper bracket 410, an iron rod 420, and a lower bracket 430. The vertical pressure cylinder 108 is fixed on the upper bracket 410, and the upper bracket 410 is connected with the lower bracket 430 through 4 iron rods 420 at the same time; the lower bracket 430 is connected with the stepper motor 230, the lower bracket 430 is an iron block, and a fixed iron frame 431 and a lower chute 432 are arranged in the middle of the iron block, and the fixed iron frame 431 is used for fixing the upper shearing box 320 in the test process so as to prevent the upper shearing box 320 from horizontally moving.
The test procedure of this example is as follows:
1) Firstly, four bolts are inserted into four upper screw holes 321 and four lower screw holes 331 to ensure that an upper shearing box 320 and a lower shearing box 330 are aligned and no water leakage occurs at the interface, then a sample is put into the upper shearing box 320 and the lower shearing box 330, vaseline is smeared on the side wall of the sample to prevent the side wall from leaking, and then filter paper, permeable stone and a pressure cap 310 are sequentially put into the sample according to test specifications; several steel balls are placed between the upper chute 334 of the lower shear box 330 and the lower chute 432 of the lower bracket 430, and then the computer is turned on to start recording the data of the displacement meter 110.
) Opening an air compressor 101, and regulating the air pressure of a vertical pressure cylinder 108 to the test design air pressure by using a pressure regulating valve 102; then, the water inlet ball valve 111 and the air discharge switch 336 are opened, the pressure regulating valve 103 and the signal generator 105 regulate the air pressure of the air cylinder 106, the water flowing pipeline of the water cylinder 107 is pushed to empty air, and the air discharge switch 336 is closed after the air is discharged.
) After the exhaust operation is finished, performing a dry-wet cycle test, and recording test values of the water yield Q and the time t of the water outlet 323 in the whole test; setting a hydraulic gradient to be consistent with a test design along with time by using the regulating pressure regulating valve 103 and the signal generator 105, and performing a penetration test;
4) After the permeation test is finished, the water inlet ball valve 111 is closed, the exhaust switch 336 is opened to empty the redundant water in the sample box 300, and then the sample box is dried in a constant temperature and humidity room to the specified water content, so that the primary drying cycle is completed;
5) Repeating the steps 2) to 4) for a plurality of times in a dry-wet cycle, and obtaining the permeability coefficient of the sample according to a standard formula according to the test value of the water yield Q and the time t, wherein the plurality of times are determined by the test design; in the whole test process, the water tank 107 is replenished with test water in the mode shown in fig. 8, a water pipe connected with the water tank 107 is placed in a barrel filled with distilled water, then an air pipe is connected with a right plug of the air cylinder 106, and air pressure pushes the piston of the water tank 107 to move leftwards through the piston of the air cylinder 106 and a bolt, so that the water tank 107 can suck distilled water to replenish test water.
) After the dry-wet cycle is finished, the four bolts are pulled out, the air pressure of the vertical pressure air cylinder 108 is regulated, the computer is opened to record the data of the pressure sensor 240, the motor controller 210 is utilized to set the motor shearing speed and shearing displacement, and the shearing test is carried out, so that the shearing strength of the sample can be measured.
The above examples are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present utility model should be made in the equivalent manner, and the embodiments are included in the protection scope of the present utility model.
Claims (1)
1. The utility model provides a infiltration direct shear device of simulation clay wet and dry circulation which characterized in that: comprises a sample box for filling a sample, a vertical pressing device, a water supply device, a shearing device and a detection device,
the vertical pressing device is arranged above the sample box and is used for applying pressure to the sample in the sample box;
the water supply device is connected with the sample box and is used for supplying water to the sample in the sample box so as to perform a penetration test;
the shearing device is arranged on one side of the sample box and is used for conducting a shearing test on the sample after the penetration test;
the detection device is connected with the sample box and the shearing device and is used for detecting and obtaining the sample permeability coefficient in the permeability test and the sample shear strength in the shearing test;
the water supply device comprises a cylinder and a water cylinder, wherein two ends of the water cylinder are respectively connected with the cylinder and the sample box, and the water supply device is used for pushing the water cylinder to supply water to the sample box by utilizing the air pressure of the cylinder;
a water inlet ball valve is arranged on a connecting pipeline between the water tank and the sample box;
the air cylinder is connected with an air compressor, and an electric proportional valve is arranged on a connecting pipeline between the air cylinder and the air compressor;
the electric proportional valve is provided with a signal generator;
the vertical pressing device is a vertical pressure cylinder, and the air compressor is connected with the vertical pressure cylinder;
the connecting pipeline between the air compressor and the vertical pressure cylinder and the connecting pipeline between the air compressor and the electric proportional valve are provided with pressure regulating valves;
a pressure cap for covering the sample is arranged above the sample box and is used for uniformly distributing the pressure applied by the vertical pressing device on the surface of the sample;
the sample box comprises an upper shearing box and a lower shearing box which are arranged correspondingly up and down; the middle part of the upper shearing box is vertically penetrated, the upper shearing box is detachably connected with the lower shearing box, the lower shearing box is lower than the sample, the vertical pressing device is abutted to the upper shearing box, the water supply device is connected with the lower shearing box, and the shearing device is transversely abutted to the lower shearing box;
the shearing device comprises a motor controller, a motor driver and a stepping motor which are sequentially connected, and a motor shaft of the stepping motor is abutted against the lower shearing box.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321854605.8U CN220584014U (en) | 2023-07-14 | 2023-07-14 | Infiltration direct shear device of simulation clay wet and dry circulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321854605.8U CN220584014U (en) | 2023-07-14 | 2023-07-14 | Infiltration direct shear device of simulation clay wet and dry circulation |
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| Publication Number | Publication Date |
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| CN220584014U true CN220584014U (en) | 2024-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202321854605.8U Active CN220584014U (en) | 2023-07-14 | 2023-07-14 | Infiltration direct shear device of simulation clay wet and dry circulation |
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| Country | Link |
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| CN (1) | CN220584014U (en) |
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2023
- 2023-07-14 CN CN202321854605.8U patent/CN220584014U/en active Active
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