CN113237779A - Direct shear test device for testing interface performance of geosynthetic material under THMC coupling effect - Google Patents
Direct shear test device for testing interface performance of geosynthetic material under THMC coupling effect Download PDFInfo
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- G—PHYSICS
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The invention discloses a direct shear test device for testing the interfacial performance of an earthwork synthetic material under the THMC coupling effect, which comprises a main frame, a direct shear instrument system, a loading system, a temperature control system and a solution supply system, wherein the main frame is provided with a direct shear instrument; the loading system comprises a vertical loading system and a horizontal loading system; the solution supply system is arranged on the right side of the main frame, the direct shear apparatus system is arranged in the middle of the main frame, and the solution supply system is connected with a solution tank in the direct shear apparatus system through a solution guide pipe; the vertical loading system is arranged on a rigid reaction frame above the direct shear apparatus system; the horizontal loading system is arranged on the main frame on the left side of the direct shear apparatus system; the temperature control system is arranged below the right side of the main frame. The device is simple and convenient to operate and adjust and easy to control. The invention realizes the measurement of the shear strength of the geosynthetic material interface under the THMC coupling effect, and the measurement result is closer to the actual engineering. And a foundation is provided for the research of the geosynthetic material under the THMC coupling effect.
Description
Technical Field
The invention relates to the technical field of environmental geotechnical engineering and geosynthetic material testing, in particular to a direct shear test device for testing the interfacial performance of a geosynthetic material under the THMC coupling action.
Background
The composite liner can well solve the seepage-proofing problem of the refuse landfill, so that the composite liner is more and more applied to the bottom position of the modern sanitary refuse landfill. However, the shear strength between each geosynthetic material in the composite liner or the interface between each geosynthetic material and the underlying soil body is low, so that the composite liner is easy to slide along different interfaces under the low shear strength, local or integral instability damage of the composite liner occurs, and the stability and the seepage-proofing performance of the integral liner system are further influenced. Therefore, the shear strength of each geosynthetic interface in the composite liner is measured, and the method has important significance for stable operation of the refuse landfill.
In the landfill engineering, because the geological environment of the composite liner is very severe, under the action of long-term high temperature, high pressure, high corrosivity and garbage leachate, the seepage field, the stress field, the chemical field and the temperature field of the composite liner are constantly changed and mutually influenced, and the very complicated THMC multi-field coupling problem is generated. Therefore, accurate determination of shear strength at the geosynthetic interface in the composite liner requires consideration of the effects of THMC coupling.
In the prior art, interfacial shear properties of geosynthetics are often measured with a direct shear apparatus. However, the existing direct shear apparatus cannot meet the test requirement of the geosynthetic interface shear strength test under the THMC coupling effect.
Therefore, the geosynthetic interface direct shear test device under the THMC coupling effect and the use method are provided, so that the shear strength of the geosynthetic interface is tested under the THMC coupling effect, the test accuracy is improved, and the device has important significance for scientific research and engineering construction.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a direct shear test device for testing the performance of the geosynthetic interface under the THMC coupling action, so as to test the shear strength of the geosynthetic interface under the THMC coupling action and improve the test accuracy.
In order to achieve the purpose, the invention provides the following technical scheme:
the direct shear apparatus comprises a main frame, a direct shear apparatus system, a solution supply system, a loading system and a temperature control system; the direct shear apparatus system is arranged on the main rack through a heavy-load horizontal sliding rail; the solution supply system is arranged on the right side of the main frame and is connected with a solution tank cover plate in the direct shear apparatus system through a solution guide pipe; the loading system comprises a vertical loading system and a horizontal loading system, the vertical loading system is arranged at the upper part of the direct shear apparatus system through a rigid reaction frame on the main frame, and the vertical loading system is in contact connection with the direct shear apparatus system through a rigid cushion block on the top surface of the direct shear apparatus system; the horizontal loading system is arranged on a main rack on the left side of the direct shear apparatus system and is in contact connection with the direct shear apparatus system through a number 1 dowel bar of the lower shear box; the temperature control system is arranged below the right side of the main frame through a control box.
The direct shear apparatus system comprises an upper shear box, a lower shear box, a ball row, a convex toothed plate, a force transmission rod No. 1 and a force transmission rod No. 2, wherein the force transmission rod No. 1 and the force transmission rod No. 2 are L-shaped and are formed by vertically connecting two rectangular plates; the upper shearing box is arranged at the top end of the lower shearing box and aligned, the No. 1 dowel bar is fixed above the left side wall of the lower shearing box by adopting a bolt, and the height of the No. 1 dowel bar is not lower than the upper end surface of the lower shearing box; the No. 2 dowel bar is fixed below the right side wall of the upper shearing box by bolts, and the height of the No. 2 dowel bar is not lower than the lower end face of the upper shearing box; a ball row is arranged between the bottom of the upper shearing box and the top of the lower shearing box, and a convex toothed plate for fixing the geosynthetic material is arranged in the upper shearing box; the heavy-load horizontal sliding rail is arranged above the main frame, the upper shearing box and the lower shearing box are arranged on the heavy-load horizontal sliding rail, and the bottom end face of the lower shearing box is in sliding contact with the heavy-load horizontal sliding rail.
The direct shear apparatus system also comprises a solution tank, a solution tank cover plate, I-shaped steel, a rigid cushion block, a ball row and a water tap; the upper shearing box and the lower shearing box are spliced, the upper shearing box is provided with an upper end opening and a lower end opening, a square ring-shaped structural member is hollow inside, the lower shearing box is provided with an upper end opening, the lower end is closed, a rectangular ring-shaped structural member is hollow inside, a ball row is arranged between the bottom of the upper shearing box and the top of the lower shearing box, a rigid cushion block for transferring force and a convex tooth plate for fixing a geosynthetic material are arranged in the upper shearing box, I-steel for fixing a sample are arranged in the lower shearing box, solution tanks for containing chemical solution or aqueous solution are arranged on the periphery of the outer wall of the lower shearing box, the solution tanks are formed by splicing rectangular plates, annular heating pipes and temperature sensors in a temperature control system are arranged in the solution tanks, stainless steel water taps for discharging liquid are arranged on the outer wall of the solution tanks, and solution tank cover plates are placed above the, the solution tank cover plate is a special-shaped plate with equal thickness, the size of the special-shaped plate is consistent with the size of the section of the solution tank, and the solution tank cover plate is provided with a solution through hole used for being connected with a solution conduit in a solution supply system and a cold air through hole used for being connected with a cold air transmission hose in a temperature control system.
And triangular convex teeth are distributed on one side wall of the convex tooth plate.
The solution supply system is arranged on the right side of the direct shear apparatus system and comprises a solution tank, a solution concentration sensor, a solution conduit and a valve; the solution concentration sensor is arranged on the inner wall of the solution tank; the solution tank is a rectangular container with the top end capable of being opened, a through hole is formed in the left side of the top of the solution tank, a valve is arranged at the through hole, and one end of the valve is connected with a solution guide pipe; the solution supply system is connected with a solution tank cover plate of the direct shear apparatus system through a solution guide pipe, and the solution guide pipe is connected with a solution through hole in the solution tank cover plate of the direct shear apparatus system through a valve.
The vertical loading system also comprises a pressure cylinder and a No. 1 pressure sensor; the rigid reaction frame is horizontally fixed on the lower side of the main frame, the pressure cylinder is vertically fixed on the rigid reaction frame, a thrust rod of the pressure cylinder is inserted into a through hole of a top plate of the rigid reaction frame, the No. 1 pressure sensor is installed on the end head of the thrust rod, the rotation center line of the No. 1 pressure sensor is collinear with the rotation center line of the thrust rod in the pressure cylinder, and the vertical loading system is positioned right above the direct shear apparatus system; the horizontal loading system comprises a horizontal thrust motor, a No. 2 pressure sensor and a displacement sensor; horizontal thrust motor adopt the support mounting in the left main frame top of direct shear appearance system, horizontal thrust motor's distance rod and the number 1 dowel steel of shearing box left wall are adjusted well perpendicularly down, 2 number pressure sensor uses the pedestal mounting in the main frame top on direct shear appearance system right side, 2 number pressure sensor's horizontal counter-force seat and the end of number 2 dowel steel are adjusted well the top tightly, displacement sensor installs on the left side outer wall of shearing box down.
The loading system also comprises a data acquisition instrument; the data acquisition instrument is positioned below a main frame on the left side of the horizontal loading system, and an interface end of the data acquisition instrument is connected with interface ends of the No. 1 pressure sensor, the No. 2 pressure sensor and the displacement sensor.
The temperature control system comprises a cold air transmission hose, a temperature sensor, an annular heating pipe, a refrigerator and a temperature controller; the annular heating pipe and the temperature sensor are arranged in a solution tank in the direct shear apparatus system, the refrigerator is arranged in a control box below the right side of the main rack, the outlet of the refrigerator is connected with the inlet end of a cold air conveying hose, and the refrigerator is connected with a solution tank cover plate in the direct shear apparatus system through the cold air conveying hose; the temperature controller is arranged in the control box, and the wiring terminals of the temperature controller are respectively connected with the refrigerator, the temperature sensor and the wiring terminal of the annular heating pipe.
The beneficial technical effects obtained by the invention are as follows:
1) the invention overcomes the defect that the existing device can not meet the requirement of testing the shear strength of the geosynthetic material interface under the THMC coupling action. The invention realizes the measurement of the shear strength of the geosynthetic interface under the THMC coupling effect, more accurately measures the shear strength of the geosynthetic interface, and provides a foundation for the THMC coupling research of the geosynthetic.
2) The THMC coupling device is provided with the temperature control system and the solution supply system, is combined with the vertical loading device, realizes the multi-field coupling of the THMC, and can realize the THMC coupling requirements of different degrees by matching with the cooperative operation of all the systems.
3) According to the invention, the convex toothed plate is arranged in the direct shear apparatus system, so that the geosynthetic material can be effectively fixed, the local slippage of the surface of the geosynthetic material is prevented, and the test precision is improved.
4) According to the invention, the ball rows with different heights can be selectively arranged between the upper shearing box and the lower shearing box according to the geosynthetic materials with different thicknesses, so that the influence of the sliding friction between the upper shearing box and the lower shearing box on test data can be effectively reduced.
5) The main components in the direct shear apparatus system and the temperature control system are all made of high-strength strong corrosion resistant materials, so that the long-time work requirements of consolidation of the geosynthetic materials under different temperatures and chemical solution conditions can be met.
Drawings
The invention is further described with reference to the accompanying drawings in which:
FIG. 1 is a front sectional view of the structural components of a direct shear test apparatus for testing the interface performance of an geosynthetic material under the coupling action of THMC.
FIG. 2 is a left sectional view of the structural composition of a direct shear test apparatus for testing the interfacial properties of geosynthetics under the THMC coupling effect according to the present invention.
FIG. 3 is a top view of the structural components of a direct shear test apparatus for testing the interfacial properties of geosynthetics under the THMC coupling effect.
Fig. 4 is a cross-sectional view of a top view of a lower shear box in a direct shear test apparatus for testing the interfacial properties of an geosynthetic material under THMC coupling according to the present invention.
FIG. 5 is a schematic diagram of a solution tank cover plate structure in a direct shear test device for testing the interface performance of an geosynthetic material under the THMC coupling effect.
FIG. 6 is a schematic diagram of an upper shear box, a lower shear box and a ball row in a direct shear test device for testing the interface performance of an geosynthetic material under the THMC coupling action.
Fig. 7 is a top view of a convex toothed plate in a direct shear test device for testing the interface performance of an geosynthetic material under the THMC coupling effect according to the present invention.
In the above drawings: 1. a main frame; 2. an upper shearing box; 3. a lower shear box; 4. a ball row; 5. a heavy-duty horizontal slide rail; 6. a booster cylinder; 7. pressure sensor number 1; 8. a rigid reaction frame; 9. a horizontal thrust motor; 10. a number 2 pressure sensor; 11. a displacement sensor; 12. a solution tank; 13. a valve; 14. a solution conduit; 15. a cold air transfer hose; 16. an annular heating pipe; 17. a temperature sensor; 18. a solution concentration sensor; 19. a data acquisition instrument; 21. no. 2 dowel bar; 22. a rigid cushion block; 23. a convex toothed plate; 24. a faucet; 25. a control box; 26. a refrigerator; 31. no. 2 dowel bar; 32. a solution tank; 33. a cover plate of the solution tank; 34. i-shaped steel; 35. solution through holes; 36. a cold air through hole.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1-7, the direct shear test apparatus for testing the interface performance of the geosynthetic material under the THMC coupling comprises a main frame, a direct shear apparatus system, a solution supply system, a loading system and a temperature control system.
The direct shear apparatus system comprises an upper shear box 2, a lower shear box 3, a solution tank 32, a solution tank cover plate 33, a force transfer rod 1, a force transfer rod 2, an I-shaped steel 34, a rigid cushion block 22, a water faucet 24, a ball row 4, a convex toothed plate 23 and a heavy-load horizontal sliding rail 5.
The upper shearing box 2, the lower shearing box 3, the solution tank 32, the solution tank cover plate 33, the dowel bar No. 1, the dowel bar No. 2, the I-steel 34, the rigid cushion block 22, the water faucet 24, the ball row 4 and the convex toothed plate 23 are all made of 304 type stainless steel materials, the upper shearing box 2 is of a hollow square structure with an opening at the bottom, the lower shearing box 3 is a rectangular box structural member with an opening at the upper end, a closed lower end and a hollow interior, the solution tank 32 is arranged on the peripheral outer wall of the lower shearing box 3, and the height of the solution tank 32 is not lower than the lower end surface of the upper shearing box 2; install ring type heating pipe 16 in the solution tank 32, be equipped with ball row 4 between the bottom of going up shear box 2 and the top of lower shear box 3, the thickness of preferred ball row can divide into specifications such as 3mm, 6mm, can select suitable ball row 4 thickness in order to satisfy the direct shear test needs at geosynthetic material interface according to the geotechnological material thickness of selecting for use in reality, upward be equipped with the protruding toothed plate 23 that is used for fixed sample and is used for the rigid cushion 22 that passes power in the shear box 2, be equipped with the screw on the I-steel 34 in the lower shear box 3 and be used for the anchor sample.
The number 1 dowel bar 31 and the number 2 dowel bar 21 are L-shaped and consist of a long arm end and a short arm end, the long arm end is vertically connected with one end of the short arm end and is made of 304 stainless steel, the number 1 dowel bar 31 is fixed on the outer wall of the left side of the lower shearing box 3 by adopting a hexagon bolt, and the long arm end of the number 1 dowel bar 31 is not lower than the upper end surface of the lower shearing box 3; no. 2 dowel steel 21 adopts hex bolts to fix on the right side outer wall of last shear box 2, and the long arm end of No. 2 dowel steel 21 is not less than the lower terminal surface of last shear box 2, the long arm end of No. 2 dowel steel 21 and No. 2 pressure sensor 10's horizontal counter-force seat top are tight, ensure to go up shear box 2 holding position motionless in shear test.
The water tap 24 is made of 304 stainless steel, is installed on the outer wall of the solution tank 32, and is used for discharging the chemical solution or the aqueous solution in the solution tank 32.
The solution tank cover plate 33 of the solution tank is a special-shaped stainless steel plate with equal thickness, is placed at the top of the solution tank 32, has the same size as the inner cavity of the solution tank 32, and is provided with 1 solution through hole 35 with the diameter of 3mm and 1 cold air through hole 36 with the diameter of 5mm on the surface of the solution tank cover plate 33, and is respectively used for being connected with the solution conduit 14 of the solution supply system and the port of the refrigerating machine 26 of the temperature control system;
the cross section of the convex tooth plate 23 is the same as that of the inner cavity of the upper shearing box 2, convex teeth with the same shape are uniformly distributed on one side wall of the convex tooth plate 23, and the convex tooth plate 23 can effectively avoid local slippage of the geosynthetic material in the shearing process;
the heavy-load horizontal sliding rail 5 consists of 4 stainless steel guide rails with the same structure, and the 4 stainless steel guide rails with the same structure are fixed above the main rack;
the solution supply system comprises a solution tank 12, a solution conduit 14, a valve 13 and a solution concentration sensor 18;
the solution tank 12 is a rectangular container with the top end capable of being opened, and is formed by splicing acrylic glass, a through hole is formed in the bottom of the side face of the solution tank 12, a valve 13 is arranged at the through hole, and one end of the valve 13 is connected with a solution guide pipe 14.
The valve 13 is arranged at the top of the left side of the solution tank and is made of stainless steel materials, so that the water flow in the solution guide pipe can be controlled;
the solution supply system is connected with the solution tank cover plate 33 of the direct shear apparatus system through the solution conduit 14, and is divided into two branch pipes through the solution conduit 14 to be connected with two solution through holes 35 on the solution tank cover plate 33 of the direct shear apparatus system.
The loading system comprises a vertical loading system and a horizontal loading system; the vertical loading system comprises a rigid reaction frame 8, a pressure cylinder 6 and a pressure sensor 7 No. 1, and the horizontal loading system comprises a horizontal thrust motor 9, a pressure sensor 10 No. 2, a displacement sensor 11 and a data acquisition instrument 19.
The rigid reaction frame 8 is composed of three rectangular plates and four stand columns, the rectangular plates are made of carbon steel materials, the four stand columns are made of stainless steel materials, the diameters of the two ends of each stand column are smaller than the diameter of the middle rod, screw rods with external threads are arranged at the two ends of each stand column, screw holes are axially arranged at the two ends of each stand column, the rotation axis of each screw hole is collinear with the rotation axis of each stand column, through holes with the same diameters as the screw rods at the two ends of each stand column are arranged at the four corners of two small rectangular plates for connecting the stand columns, the through holes at the four corners of the two small rectangular plates are sleeved on the screw rods at the upper ends of the four stand columns and are spliced and installed with the large rectangular plate, and the large rectangular plate provides support for the vertically arranged pressurizing cylinder 6; the center of the large rectangular plate is provided with a thrust rod through hole with the diameter equal to that of the thrust rod of the pressure cylinder 6, and the thrust rod can apply acting force to the rigid cushion block 22 in the direct shear system through the thrust rod through hole.
The horizontal thrust motor 9 is arranged above the main frame on the left side of the direct shear apparatus system through a support, a thrust rod of the horizontal thrust motor 9 is aligned and vertical to the force transfer rod No. 1 on the left wall of the lower shear box 3, and the horizontal thrust motor is horizontally fixed on the support to provide a horizontal load for the direct shear apparatus system;
the No. 1 pressure sensor 8 is arranged on the end head of the thrust rod of the pressure cylinder 6 and records the vertical pressure acting on the geosynthetic material or the soil body; the No. 2 pressure sensor 10 is arranged on the main frame on the right side of the direct shear apparatus system through a support, and the end of the No. 2 pressure sensor 10 is aligned with and vertical to the No. 2 dowel bar 21 and is horizontally fixed on the support; the displacement sensor 11 is positioned on the outer wall of the left side of the lower shearing box 3, and is arranged on the main frame 1 by adopting a matched accessory of the displacement sensor 11.
The data acquisition instrument 19 is positioned below the main frame and has an automatic acquisition and automatic storage function, and the interface ends of the No. 1 pressure sensor 7, the No. 2 pressure sensor 10 and the displacement sensor 11 are directly connected with the port section of the data acquisition instrument 19, so that test data can be acquired in real time.
The temperature control system comprises an annular heating pipe 16, a temperature sensor 17, a temperature controller 20, a refrigerator 26 and a cold air transmission hose 15.
The refrigerator 26 is positioned in the control box 25 below the main frame 1, an air outlet of the refrigerator 26 is connected with a cold air through hole 36 on a solution tank cover plate 33 through a cold air transmission hose 15, and the annular heating pipe 16 and the temperature sensor 17 are both positioned in a solution tank 32 of the direct shear apparatus system; the temperature controller 20 is arranged in the control box 25, and the terminals of the temperature controller 20 are respectively connected with the refrigerator 26, the temperature sensor 17 and the terminal of the annular heating pipe 16.
The working process of the shear test of the geosynthetic material interface by the device is as follows: opening the upper top cover of the solution tank 12, adding a chemical solution or water into the solution tank 12, and observing the reading of the solution concentration sensor 18 to adjust to a specified concentration; putting an I-steel 34 into a lower shearing box 3, paving a geomembrane GM sample of 300mm multiplied by 360mm on the I-steel 34, selecting a ball row 4 with the height of 3mm or 6mm according to the thickness condition of GM + GCL, then putting an upper shearing box 2 on the lower shearing box 3, putting a GCL sample of 300mm multiplied by 300mm in size, sequentially putting a convex toothed plate 23 and a rigid cushion block 22 on the top surface of the GCL, and installing a solution tank cover plate 33 on a solution tank 32; opening a valve 13 of the solution supply system, supplementing aqueous solution or chemical solution to the direct shear apparatus system, and ensuring that the immersion water level is more than 10mm higher than the geosynthetic material interface; the vertical loading device and the horizontal loading device are controlled by a computer to apply vertical load and horizontal shear force; the temperature control system sets the temperature required by the test, the annular heating pipe 16 and the refrigerating machine 26 in the solution tank 32 will be automatically started, and when the temperature in the solution tank 32 reaches the preset value, the temperature controller 20 in the temperature control system controls the opening and closing of the refrigerating machine 26 and the annular heating pipe 16 to maintain the temperature in the solution tank 32 at the preset temperature all the time. And starting the vertical loading system and the horizontal loading system, and acquiring loading information and displacement information in the test process by the data acquisition instrument 19 and recording data.
The above description is only for the purpose of illustration in conjunction with the present process, and does not limit the present structure, and it is obvious to those skilled in the art that various changes and modifications can be made in the present invention, for example, the combination of a plurality of the present entities, the change of the materials used, and the like. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A direct shear test device for testing the interfacial properties of an geosynthetic material under the coupling action of THMC is characterized in that: comprises a main frame (1), a direct shear apparatus system, a solution supply system, a loading system and a temperature control system; the direct shear apparatus system is arranged on the main frame (1) through a heavy-load horizontal sliding rail (5); the solution supply system is arranged on the right side of the main frame (1) and is connected with a solution tank cover plate (33) in the direct shear apparatus system through a solution guide pipe (14); the loading system comprises a vertical loading system and a horizontal loading system, the vertical loading system is arranged at the upper part of the direct shear apparatus system through a rigid reaction frame (8) on a main frame (1), and the vertical loading system is in contact connection with the direct shear apparatus system through a rigid cushion block (22) on the top surface of the direct shear apparatus system; the horizontal loading system is arranged on a main frame (1) on the left side of the direct shear apparatus system and is in contact connection with the direct shear apparatus system through a number 1 dowel bar (31) of the lower shear box (3); the temperature control system is arranged below the right side of the main frame (1) through a control box (25).
2. The direct shear test device for testing the interfacial properties of the geosynthetic materials under the THMC coupling action according to claim 1, wherein the direct shear apparatus system comprises an upper shear box (2), a lower shear box (3), a ball row (4), a convex toothed plate (23), a force transmission rod No. 1 (31) and a force transmission rod No. 2 (21), wherein the force transmission rod No. 1 (31) and the force transmission rod No. 2 (21) are L-shaped and are formed by vertically connecting two rectangular plates; the upper shearing box (2) is arranged at the top end of the lower shearing box (3) and aligned, the number 1 dowel bar (31) is fixed above the left side wall of the lower shearing box (3) by bolts, and the height of the number 1 dowel bar (31) is not lower than the upper end surface of the lower shearing box (3); the No. 2 dowel bar (21) is fixed below the right side wall of the upper shearing box (2) by bolts, and the height of the No. 2 dowel bar (21) is not lower than the lower end face of the upper shearing box (2); a ball row (4) is arranged between the bottom of the upper shearing box (2) and the top of the lower shearing box (3); a convex toothed plate (23) for fixing the geosynthetic material is arranged in the upper shearing box (2); heavy-duty horizontal slide rail (5) are installed in main frame (1) top, go up shear box (2) and install on heavy-duty horizontal slide rail (5) with lower shear box (3), and the bottom face of lower shear box (3) is connected with heavy-duty horizontal slide rail (5) sliding contact.
3. The direct shear test device for testing the interfacial properties of the geosynthetic material under the THMC coupling action of claim 1, wherein the direct shear apparatus system further comprises a solution tank (32), a solution tank cover plate (33), I-steel (34), a rigid cushion block (22), a ball row (4) and a water tap (24); go up shear box (2) and shear down box (3) be the concatenation and form, go up shear box (2) be upper and lower both ends opening, inside hollow square ring type structure, shear down box (3) are the upper end opening, the lower extreme seals, inside hollow rectangle ring type structure, be equipped with ball row (4) between the bottom of going up shear box (2) and the top of shear down box (3), be equipped with in going up shear box (2) and be used for biography rigid cushion (22) and fixed geosynthetic material's protruding pinion rack (23), be equipped with I-steel (34) that are used for fixed sample in shear down box (3), shear down box (3) outer wall is equipped with all around and is used for holding solution (32) of chemical solution or aqueous solution, solution tank (32) adopt the rectangular board concatenation to form, annular heating pipe (16) and temperature sensor (17) among the temperature control system all set up in solution tank (32), the outer wall of the solution tank (32) is provided with a stainless steel water tap (24) for discharging liquid, a solution tank cover plate (33) is arranged above the solution tank (32), the solution tank cover plate (33) is a special-shaped plate with equal thickness and has the same size as the cross section of the solution tank (32), and the solution tank cover plate (33) is provided with a solution through hole (35) for connecting with a solution conduit (14) in a solution supply system and a cold air through hole (36) for connecting with a cold air conveying hose (15) in a temperature control system.
4. The direct shear test device for testing the interfacial properties of the geosynthetic material under the THMC coupling as claimed in claim 2, wherein triangular teeth are distributed on one side wall of the toothed spur plate (23).
5. The direct shear test device for testing the interfacial properties of the geosynthetic material under the THMC coupling as claimed in claim 1, wherein said solution supply system is installed at the right side of the direct shear system, and comprises a solution tank (12), a solution concentration sensor (18), a solution conduit (14) and a valve (13); the solution concentration sensor (18) is arranged on the inner wall of the solution tank (12); the solution tank (12) is a rectangular container with the top end capable of being opened, a through hole is formed in the left side of the top of the solution tank (12), a valve (13) is arranged at the through hole, and one end of the valve (13) is connected with a solution guide pipe (14); the solution supply system is connected with a solution tank cover plate (33) of the direct shear apparatus system through a solution conduit (14), and the solution conduit (14) is connected with a solution through hole (35) on the solution tank cover plate (33) of the direct shear apparatus system through a valve (13).
6. The direct shear test device for testing the interfacial properties of the geosynthetic material under the THMC coupling action as claimed in claim 1, wherein said vertical loading system further comprises a pressure cylinder (6) and a No. 1 pressure sensor (7); the rigid reaction frame (8) is horizontally fixed on the lower side of the main frame (1), the pressure cylinder (6) is vertically fixed on the rigid reaction frame (8), a thrust rod of the pressure cylinder (6) is inserted into a through hole of a top plate of the rigid reaction frame (8), the No. 1 pressure sensor (7) is installed on the end head of the thrust rod, the rotation center line of the No. 1 pressure sensor (7) is collinear with the rotation center line of the thrust rod in the pressure cylinder (6), and the vertical loading system is positioned right above the direct shear apparatus system; the horizontal loading system comprises a horizontal thrust motor (9), a No. 2 pressure sensor (10) and a displacement sensor (11); horizontal thrust motor (9) adopt the support mounting to adjust perpendicularly well in main frame (1) top on direct shear appearance system left side, the thrust rod of horizontal thrust motor (9) and number 1 dowel steel (31) of shearing box (3) left wall down, number 2 pressure sensor (10) use the pedestal mounting in the main frame top on direct shear appearance system right side, the end of the horizontal counter-force seat of number 2 pressure sensor (10) and number 2 dowel steel (21) is adjusted well and is pushed up tightly, displacement sensor (11) are installed on the left side outer wall of shearing box (3) down.
7. The direct shear test device for testing the interfacial properties of the geosynthetic material under the THMC coupling as set forth in claim 1, wherein said loading system further comprises a data acquisition instrument (19); the data acquisition instrument (19) is positioned below the main frame (1) on the left side of the horizontal loading system, and the interface end of the data acquisition instrument (19) is connected with the interface ends of the No. 1 pressure sensor (7) and the No. 2 pressure sensor (10) and the displacement sensor (11).
8. The direct shear test device for testing the interfacial properties of the geosynthetic material under the THMC coupling effect as claimed in claim 1, wherein said temperature control system comprises a cold air transfer hose (15), a temperature sensor (17), an annular heating pipe (16), a refrigerator (26) and a thermostat (20); the annular heating pipe (16) and the temperature sensor (17) are arranged in a solution tank (32) in the direct shear apparatus system, the refrigerator (26) is arranged in a control box (25) below the right side of the main frame (1), the outlet of the refrigerator (26) is connected with the inlet end of the cold air transmission hose (15), and the refrigerator (26) is connected with a solution tank cover plate (33) in the direct shear apparatus system through the cold air transmission hose (15); the temperature controller (20) is arranged in the control box (25), and the terminals of the temperature controller (20) are respectively connected with the refrigerator (8), the temperature sensor (17) and the terminals of the annular heating pipe (16).
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| CN202110456263.3A CN113237779A (en) | 2021-04-26 | 2021-04-26 | Direct shear test device for testing interface performance of geosynthetic material under THMC coupling effect |
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Application publication date: 20210810 |