Testing device for seepage creep coupling characteristic of rock-soil body

Abstract

The invention relates to a rock-soil body permeation creep coupling characteristic test device, which comprises a sample carrier, a pressurization assembly, a water supply assembly, a water pressure test assembly and a drying assembly, the sample carrier comprises a sample cylinder and two water permeable plates arranged in parallel, the top of the sample cylinder is open, and the two water permeable plates are arranged in the sample cylinder along the vertical direction; the drying assembly comprises a central vertical pipe, a plurality of circumferential vertical pipes and a hot air supply part, the central vertical pipe and the sample cylinder are coaxially arranged and penetrate through the sample cavity, the plurality of circumferential vertical pipes are uniformly arranged in the circumferential direction of the central vertical pipe and penetrate through the sample cavity, and the hot air supply part is communicated with the central vertical pipe and the plurality of circumferential vertical pipes; the problems that a rock-soil body sample is heated by adopting a heating cylinder, the rock body in the heating cylinder is heated unevenly, the temperature difference between the exterior and the interior of the rock-soil body sample is large, the water dissipation speed is low, and the test efficiency is influenced are solved.

Description

Technical Field

[0001] The invention relates to the technical field of geotechnical engineering, in particular to a test device for measuring seepage creep coupling characteristics of a rock-soil body under the combined effects of stress and dry-wet cycles. Background Art

[0002] Determining the seepage-creep coupling characteristics of rock and soil under the combined action of stress and dry-wet cycles can provide a reliable experimental basis for obtaining the mechanical properties of rock and soil under the combined action of periodic reservoir water and stress, and obtain mechanical properties that are more in line with the actual storage environment of rock and soil in the drawdown zone.

[0003] For example, the invention application with application number CN201910465102.3 proposes an experimental device and method for determining the seepage creep coupling characteristics of rock and soil under the combined action of stress and dry-wet cycles, which includes a base with a bracket, a reaction frame is installed on the base, a lower cover is arranged on the base between two vertical rods of the reaction frame, a sample heating cylinder with an open top surface is arranged on the lower cover, an upper cover with a middle opening is arranged on the top of the sample heating cylinder, the bottom surface of the sample heating cylinder is a lower permeable plate, and a sample heating cylinder with a rock and soil structure is also placed in the sample heating cylinder. The upper permeable plate matches the body sample, the pad placed in the middle of the upper permeable plate matches the lower end of the force transmission piston passing through the middle opening of the upper cover, the upper end of the force transmission piston is connected to the loading hydraulic cylinder, the middle of the force transmission piston is connected to the pressure sensor, the loading hydraulic cylinder is installed on the cross bar-bottom of the reaction frame and is connected to the load control system, the overflow pipe is connected to the side wall of the upper cover, and the lower cover is connected to the water head control system through the water inlet pipe; pressure measuring holes are respectively opened in the upper, middle and lower parts of the side wall of the sample heating cylinder; a deformation sensor is also arranged on the upper cover.

[0004] However, the rock mass in the heating tube is heated unevenly, the temperature difference between the outside and inside of the rock mass sample is large, and the water dissipates slowly, which affects the test efficiency. Summary of the invention

[0005] In view of this, it is necessary to provide a test device for the permeability-creep coupling characteristics of rock and soil, so as to solve the problems that when heating rock and soil samples, the rock in the heating tube is heated unevenly, the temperature difference between the outside and inside of the rock and soil samples is large, and the water dissipation rate is slow, which affects the test efficiency.

[0006] The present invention provides a test device for measuring the seepage creep coupling characteristics of rock and soil under the combined action of stress and dry-wet cycle, comprising a sample carrier, a pressurizing component, a water supply component, a water pressure test component and a drying component, wherein the sample carrier comprises a sample tube and two water-permeable plates arranged in parallel, the top of the sample tube is open, the two water-permeable plates are arranged in the sample tube in a vertical direction, the water-permeable plate close to the opening is slidably connected to the sample tube, the water-permeable plate away from the opening is fixedly connected to the sample tube, the sample cavity is formed between the two water-permeable plates, and a water diversion cavity is formed between the water-permeable plate away from the opening and the sample tube; the pressurizing component comprises a pressurizing component connected to the water-permeable plate close to the opening; The pressure end and the deformation detection end, the pressure end is used to pressurize the water-permeable plate, and the deformation detection end is used to detect the deformation of the water-permeable plate; the water supply component is connected with the water diversion cavity; the water pressure detection end is connected with the sample cavity to detect the pressure in the sample cavity; the drying component includes a central vertical pipe, a plurality of circumferential vertical pipes and a hot air supply component, the central vertical pipe is coaxially arranged with the sample tube and passes through the sample cavity, the plurality of circumferential vertical pipes are evenly arranged along the circumference of the central vertical pipe and pass through the sample cavity, the hot air supply component is connected with the central vertical pipe and the plurality of circumferential vertical pipes, and is used to form a heated airflow for drying the sample in the sample cavity on the central vertical pipe and the plurality of circumferential vertical pipes.

[0007] Furthermore, the pressurizing end of the pressurizing component is a hydraulic press, which is horizontally placed above the sample tube via a bracket, and the output end of the hydraulic press moves in a vertical downward direction.

[0008] Furthermore, the deformation detection end of the pressurizing component is a deformation sensor, and the deformation sensor is installed above the water-permeable plate close to the opening.

[0009] Furthermore, the water supply assembly includes a water tank, a water pump and a connecting pipe, one end of the water pump is connected to the water tank, and the other end of the water pump is connected to the bottom of the water diversion chamber via the connecting pipe.

[0010] Furthermore, the water pressure testing assembly includes a water pressure detector and a plurality of water pressure detection ends, the plurality of water pressure detection ends are electrically connected to the water pressure detector, and the plurality of water pressure detection ends extend into the sample cavity and are respectively located at different horizontal heights.

[0011] Furthermore, the water-permeable plate close to the opening is slidably connected to the central column and the plurality of circumferential risers.

[0012] Furthermore, the bottom ends of the central column and the plurality of circumferential risers pass through the water-permeable plate away from the opening to the water inlet cavity and are connected to the hot air supply component.

[0013] Furthermore, the bottom ends of the plurality of circumferential risers are connected to the side wall of the bottom of the central column, and the bottom end of the central column is connected to the hot air supply component.

[0014] Furthermore, the hot air supply component includes a fan and a heater, and the fan is connected to the central column and the plurality of circumferential risers via the heater.

[0015] Furthermore, it also includes an overflow reflux component, which includes an overflow pipe and a reflux box. One end of the overflow pipe is connected to the interior of the sample tube and above the water-permeable plate close to the opening, and the other end of the overflow pipe is connected to the reflux box.

[0016] Compared with the prior art, the rock and soil sample to be tested is placed in the sample cavity, and stress is applied to the permeable plate near the opening through the pressurizing end of the pressurizing component, and the stress value is recorded. At the same time, the deformation of the permeable plate above, i.e., the rock and soil sample, can be detected through the deformation detection end. Water can be introduced into the water diversion cavity, i.e., the sample cavity, through the water pressure test component, and a certain pressure can be applied. The water pressure value of the rock and soil sample in the sample cavity can be detected through the water pressure detection component. The moisture in the rock sample can be dissipated through the drying component. Repeating the previous process can obtain the permeability and creep coupling characteristics of the rock and soil mass under the dry-wet cycle under stress conditions in the reservoir bank drawdown zone. Among them, the central riser and multiple circumferential risers are evenly distributed in the sample cavity, and the heated air flow flowing therein performs heat exchange with the rock sample in the sample cavity, thereby realizing uniform heating treatment, fast moisture dissipation speed, and high experimental efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the overall structure of a test device for measuring the seepage-creep coupling characteristics of a rock mass under the combined effects of stress and dry-wet cycles provided in an embodiment of the present invention;

[0018] Figure 2 A schematic structural diagram of a drying component in a test device for measuring the seepage-creep coupling characteristics of a rock mass under the combined effects of stress and dry-wet cycles provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0020] like Figure 1-2As shown, the test device for measuring the seepage creep coupling characteristics of rock and soil under the combined action of stress and dry-wet cycle provided by the present invention comprises a sample carrier 100, a pressurizing component 200, a water supply component 300, a water pressure test component 400 and a drying component 500, wherein the sample carrier 100 comprises a sample barrel 110 and two water-permeable plates 120 arranged in parallel, the top of the sample barrel 110 is open, the two water-permeable plates 120 are arranged in the sample barrel 110 along the vertical direction, the water-permeable plate 120 close to the opening is slidably connected to the sample barrel 110, the water-permeable plate 120 far from the opening is fixedly connected to the sample barrel 110, a sample cavity 111 is formed between the two water-permeable plates 120, and a water diversion cavity 112 is formed between the water-permeable plate 120 far from the opening and the sample barrel 110; the pressurizing component 200 comprises a pressurizing end 2 connected to the water-permeable plate 120 close to the opening 10 and a deformation detection end 220, the pressurizing end 210 is used to pressurize the water-permeable plate 120, and the deformation detection end 220 is used to detect the deformation of the water-permeable plate 120; the water supply component 300 is connected to the water diversion chamber 112; the water pressure detection end 420 is connected to the sample chamber 111 to detect the pressure in the sample chamber 111; the drying component 500 includes a central vertical pipe 510, a plurality of circumferential vertical pipes 520 and a hot air supply component 530, the central vertical pipe 510 is coaxially arranged with the sample tube 110 and is arranged through the sample chamber 111, the plurality of circumferential vertical pipes 520 are evenly arranged along the circumference of the central vertical pipe 510 and are arranged through the sample chamber 111, and the hot air supply component 530 is connected to the central vertical pipe 510 and the plurality of circumferential vertical pipes 520, so as to form a heated airflow for drying the sample in the sample chamber 111 in the central vertical pipe 510 and the plurality of circumferential vertical pipes 520.

[0021] During implementation, the rock and soil sample to be tested is placed in the sample cavity 111, and stress is applied to the water-permeable plate 120 near the opening through the pressurizing end 210 of the pressurizing component 200, and the stress value is recorded. At the same time, the deformation of the water-permeable plate 120 above, i.e., the rock and soil sample, can be detected through the deformation detection end 220. Water can be introduced into the water diversion cavity 112, i.e., the sample cavity 111, through the water pressure test component 400, and a certain pressure can be applied. The water pressure of the rock and soil sample in the sample cavity 111 can be detected through the water pressure detection component. The drying assembly 500 can be used to dissipate the moisture in the rock sample, and the previous process is repeated to obtain the permeability and creep coupling characteristics of the rock mass under the dry-wet cycle of the rock mass in the reservoir bank drawdown zone under stress conditions. The central riser 510 and multiple circumferential risers 520 are evenly distributed in the sample cavity 111, and the heated air flow flowing therein exchanges heat with the rock sample in the sample cavity 111, thereby achieving uniform heating treatment, fast moisture dissipation, and high experimental efficiency.

[0022] The sample carrier 100 in this embodiment is a structure for carrying rock samples. Specifically, the sample carrier 100 includes a sample tube 110 and two water-permeable plates 120 arranged in parallel. The top of the sample tube 110 is open, and the two water-permeable plates 120 are arranged in the sample tube 110 along the vertical direction. The water-permeable plate 120 close to the opening is slidably connected to the sample tube 110, and the water-permeable plate 120 away from the opening is fixedly connected to the sample tube 110. A sample cavity 111 is formed between the two water-permeable plates 120, and a water diversion cavity 112 is formed between the water-permeable plate 120 away from the opening and the sample tube 110.

[0023] The pressurizing assembly 200 in this embodiment is a structure for applying pressure to the rock sample. By applying pressure to the water-permeable plate 120 near the opening, stress is transmitted to the rock sample in the sample cavity 111. The pressurizing assembly 200 includes a pressurizing end 210 and a deformation detection end 220 connected to the water-permeable plate 120 near the opening. The pressurizing end 210 is used to pressurize the water-permeable plate 120, and the deformation detection end 220 is used to detect the deformation of the water-permeable plate 120.

[0024] In one embodiment, the pressurizing end 210 of the pressurizing assembly 200 is a hydraulic press, which is horizontally placed above the sample cylinder 110 via a bracket, and the output end of the hydraulic press moves in a vertical downward direction.

[0025] In one embodiment, the deformation detection end 220 of the pressurizing assembly 200 is a deformation sensor, and the deformation sensor is installed above the water-permeable plate 120 close to the opening.

[0026] The water supply assembly 300 in this embodiment is a structure for supplying water to the rock sample in the sample chamber 111. The water supply assembly 300 is connected to the water diversion chamber 112.

[0027] In one embodiment, the water supply assembly 300 includes a water tank 310 , a water pump 320 and a connecting pipe 330 , one end of the water pump 320 is connected to the water tank 310 , and the other end of the water pump 320 is connected to the bottom of the water diversion chamber 112 via the connecting pipe 330 .

[0028] The water pressure testing assembly 400 in this embodiment is used to detect the water pressure in the sample chamber 111. The water pressure detection terminal 420 is connected to the sample chamber 111 to detect the pressure in the sample chamber 111.

[0029] In one embodiment, the water pressure testing assembly 400 includes a water pressure detector 410 and a plurality of water pressure detection ends 420 . The plurality of water pressure detection ends 420 are electrically connected to the water pressure detector 410 . The plurality of water pressure detection ends 420 extend into the sample cavity 111 and are respectively located at different levels.

[0030] The drying assembly 500 in this embodiment is a structure for drying the water in the rock sample in the sample cavity 111, thereby realizing the function of dry-wet cycle. Specifically, the drying assembly 500 includes a central vertical pipe 510, a plurality of circumferential vertical pipes 520, and a hot air supply member 530. The central vertical pipe 510 is coaxially arranged with the sample cylinder 110 and is arranged through the sample cavity 111. The plurality of circumferential vertical pipes 520 are evenly arranged along the circumference of the central vertical pipe 510 and are arranged through the sample cavity 111. The hot air supply member 530 is connected with the central vertical pipe 510 and the plurality of circumferential vertical pipes 520, so as to form a heated airflow in the central vertical pipe 510 and the plurality of circumferential vertical pipes 520 to dry the sample in the sample cavity 111.

[0031] In one embodiment, the permeable plate 120 near the opening is slidably connected to the central column and a plurality of circumferential risers 520 .

[0032] In one embodiment, the bottom ends of the central column and the plurality of circumferential risers 520 pass through the water-permeable plate 120 away from the opening to the water inlet cavity 112 and are connected to the hot air supply member 530 .

[0033] In one embodiment, the bottom ends of the plurality of circumferential risers 520 are connected to the side wall of the bottom of the central column, and the bottom end of the central column is connected to the hot air supply member 530 .

[0034] In one embodiment, the hot air supply member 530 includes a fan and a heater, and the fan is connected to the central column and the plurality of circumferential risers 520 via the heater.

[0035] In one embodiment, an overflow reflux assembly 600 is also included, which includes an overflow pipe 610 and a reflux box 620. One end of the overflow pipe 610 is connected to the interior of the sample tube 110 and the upper position of the permeable plate 120 close to the opening, and the other end of the overflow pipe 610 is connected to the reflux box 620.

[0036] Compared with the prior art: the rock and soil sample to be tested is placed in the sample cavity 111, and stress is applied to the water-permeable plate 120 near the opening through the pressurizing end 210 of the pressurizing component 200, and the stress value is recorded. At the same time, the deformation of the water-permeable plate 120 above, i.e., the rock and soil sample, can be detected through the deformation detection end 220. Water can be introduced into the water diversion cavity 112, i.e., the sample cavity 111, and a certain pressure can be applied through the water pressure testing component 400. The rock and soil sample in the sample cavity 111 can be detected through the water pressure detection component. The water pressure value can be obtained by drying the component 500 to dissipate the water in the rock sample, and the previous process can be repeated to obtain the permeability and creep coupling characteristics of the rock and soil under the dry-wet cycle of the rock and soil in the reservoir bank drawdown zone under stress conditions. The central riser 510 and multiple circumferential risers 520 are evenly distributed in the sample cavity 111, and the heated air flow flowing therein exchanges heat with the rock sample in the sample cavity 111, thereby achieving uniform heating treatment, fast water dissipation speed and high experimental efficiency.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A test device for determining the seepage-creep coupling characteristics of rock and soil under the combined action of stress and dry-wet cycles, characterized in that: It includes a sample carrier, a pressurizing component, a water supply component, a water pressure testing component and a drying component; The sample carrier comprises a sample tube and two water-permeable plates arranged in parallel, the top of the sample tube is open, the two water-permeable plates are arranged in the sample tube along the vertical direction, the water-permeable plate close to the opening is slidably connected to the sample tube, the water-permeable plate away from the opening is fixedly connected to the sample tube, the sample cavity is formed between the two water-permeable plates, and a water diversion cavity is formed between the water-permeable plate away from the opening and the sample tube; The pressurizing assembly comprises a pressurizing end and a deformation detecting end connected to the water-permeable plate near the opening, the pressurizing end is used to pressurize the water-permeable plate, and the deformation detecting end is used to detect the deformation of the water-permeable plate; The water supply assembly is in communication with the water diversion chamber; The water pressure detection end is connected to the sample chamber to detect the pressure in the sample chamber; The drying component includes a central vertical pipe, a plurality of circumferential vertical pipes and a hot air supply component. The central vertical pipe is coaxially arranged with the sample tube and passes through the sample cavity. The plurality of circumferential vertical pipes are evenly arranged along the circumference of the central vertical pipe and pass through the sample cavity. The hot air supply component is connected with the central vertical pipe and the plurality of circumferential vertical pipes to form a heated airflow on the central vertical pipe and the plurality of circumferential vertical pipes for drying the sample in the sample cavity.

2. The test device for measuring the coupled characteristics of rock mass seepage creep under the combined effects of stress and dry-wet cycles according to claim 1 is characterized in that: The pressurizing end of the pressurizing component is a hydraulic press, which is horizontally placed above the sample tube via a bracket, and the output end of the hydraulic press moves in a vertical downward direction.

3. The test device for measuring the coupled characteristics of rock mass seepage creep under the combined effects of stress and dry-wet cycles according to claim 1 is characterized in that: The deformation detection end of the pressurizing component is a deformation sensor, and the deformation sensor is installed above the water-permeable plate close to the opening.

4. The test device for measuring the coupled characteristics of rock mass seepage creep under the combined effects of stress and dry-wet cycles according to claim 1 is characterized in that: The water supply assembly includes a water tank, a water pump and a connecting pipe. One end of the water pump is connected to the water tank, and the other end of the water pump is connected to the bottom of the water diversion chamber via the connecting pipe.

5. The test device for measuring the coupled characteristics of rock mass seepage creep under the combined effects of stress and dry-wet cycles according to claim 1 is characterized in that: The water pressure testing assembly includes a water pressure detector and a plurality of water pressure detection ends, wherein the plurality of water pressure detection ends are electrically connected to the water pressure detector, and the plurality of water pressure detection ends extend into the sample cavity and are respectively located at different horizontal heights.

6. The test device for measuring the coupled characteristics of rock mass seepage creep under the combined effects of stress and dry-wet cycles according to claim 1 is characterized in that: The water-permeable plate close to the opening is slidably connected to the central column and the plurality of circumferential risers.

7. The test device for measuring the coupled characteristics of rock mass seepage creep under the combined effects of stress and dry-wet cycles according to claim 1 is characterized in that: The bottom ends of the central column and the plurality of circumferential risers pass through the water-permeable plate away from the opening to the water-introducing cavity and are connected to the hot air supply component.

8. The test device for measuring the coupled characteristics of rock mass seepage creep under the combined effects of stress and dry-wet cycles according to claim 7, characterized in that: The bottom ends of the plurality of circumferential risers are connected to the side wall of the bottom of the central column, and the bottom end of the central column is connected to the hot air supply component.

9. The test device for measuring the coupled characteristics of rock mass seepage creep under the combined effects of stress and dry-wet cycles according to claim 1, characterized in that: The hot air supply component includes a fan and a heater, and the fan is connected to the central column and the plurality of circumferential risers via the heater.

10. The test device for measuring the coupled characteristics of rock mass seepage creep under the combined effects of stress and dry-wet cycles according to claim 1, characterized in that: It also includes an overflow reflux component, which includes an overflow pipe and a reflux box. One end of the overflow pipe is connected to the interior of the sample tube and above the water-permeable plate close to the opening, and the other end of the overflow pipe is connected to the reflux box.

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