A device and method for testing rock mass structural plane under dry-wet cycle under hydrodynamic pressure

Abstract

The present application relates to a kind of rock mass structure surface dry-wet cycle test device and test method under hydrodynamic pressure, wherein, test device includes the test box for placing sample, dynamic water control unit, drying unit, opening control unit and digital control system, test box includes box, multiple horizontal partitions and be located in the sample holder of corresponding placement cavity, sample holder includes the lower fixed frame of being fixed on the upper surface of corresponding horizontal partition and the upper fixed frame of being located on the side wall of box by vertical slide rail structure, upper and lower fixed frame between having test box air outlet and test box water outlet.The test device of the present application, by the opening data recorded by opening control unit, in the dry-wet cycle process, digital control system can monitor the flow rate, water pressure, water temperature and other parameters of circulating water and the temperature of air, and control water temperature, pressure, flow rate and other parameters, control the temperature and flow rate of dry air, while multiple groups of samples are tested.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of geotechnical engineering, and in particular to a device and method for testing the dry-wet cycle of rock mass structural planes under dynamic water pressure. BACKGROUND

[0002] Due to the natural environment, the rock mass is subjected to the dry-wet cycle of different pressure water flow for a long time. The physical and mechanical properties of the rock mass structural plane, as the weak link of the rock mass, may deteriorate, leading to further geological disasters and engineering instability. Therefore, the influence of dry-wet cycle on the rock mass, especially the rock mass structural plane, cannot be ignored.

[0003] In recent years, there have been some test devices and scientific researches on rock mass samples and rock mass structural plane samples under the action of dry-wet cycle. However, most of the existing researches are based on static water pressure conditions, and few consider the physical and mechanical properties of rock mass structural planes under dynamic water pressure, especially the influence of different opening degrees. During the test process, a limited number of samples are placed in a water storage container for saturation. This method has the problems of difficulty in maintaining constant opening degree, long saturation time, and different saturation degrees. In addition, the test period is usually long, and there is no measure to ensure the constant water temperature during the saturation process.

[0004] Therefore, how to realize the dry-wet cycle process of a batch of rock mass structural plane samples under dynamic water pressure is a theoretical and technical problem to be further studied in the field of geotechnical engineering. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a device and method for testing the dry-wet cycle of rock mass structural planes under dynamic water pressure. The device can independently control the opening degree of each rock mass structural plane sample and control the dynamic water pressure during the saturation process.

[0006] The test device is suitable for studying the geotechnical mechanical properties of rock mass structural plane samples under dry-wet cycle conditions.

[0007] To achieve the above-mentioned purpose, the present application realizes the following technical solutions:

[0008] The application discloses a kind of rock mass structure surface dry-wet cycle test device under hydrodynamic pressure, including for placing sample test box, dynamic water control unit, drying unit, opening control unit and digital control system, the test box includes box, in the vertical direction from bottom to top the box is divided into multiple layers and is placed in the cavity of multiple horizontal partitions, and test sample holder is arranged in the corresponding cavity, test sample holder includes the lower fixed frame fixed on the upper surface of corresponding horizontal partition and the upper fixed frame arranged on the side wall of box by vertical slide rail structure, upper and lower fixed frame have test box air outlet and test box water outlet between, the dynamic water control unit includes water tank, electric heater arranged in water tank, water pump and water tank outlet pipe connected with each of the cavity, first solenoid valve is arranged on each water tank outlet pipe, the drying unit includes drying machine and drying machine air outlet pipe connected with each of the cavity, second solenoid valve is arranged in drying machine air outlet pipe, the water tank is connected with test box water outlet by test box drain pipe, third solenoid valve is arranged on test box drain pipe, fourth solenoid valve is arranged on test box air outlet, opening control unit is fixed on the side wall of box above upper fixed frame, and the lower end of opening control unit is fixed on upper fixed frame, the digital control system includes controller, temperature sensor arranged in each cavity for monitoring drying temperature and circulating water temperature, pressure sensor and flow sensor, the temperature sensor is located in front of corresponding water tank outlet pipe and drying machine air outlet pipe, the controller is connected with temperature sensor, pressure sensor, flow sensor, opening control unit, first solenoid valve, second solenoid valve, third solenoid valve, fourth solenoid valve, electric heater, water pump and drying machine respectively.

[0009] Preferably, the lower fixed frame includes a lower plate fixed on the upper surface of the corresponding horizontal partition and a lower clamping unit fixed on the lower plate, the lower clamping unit includes a lower fixed plate, a first left clamping block fixed on the lower fixed plate, and a first right clamping block slidingly arranged on the lower fixed plate through a transverse lower slide rail structure; the upper fixed frame includes an upper plate fixed on the side wall of the box through a vertical slide rail structure and an upper clamping unit fixed on the lower surface of the upper plate, the upper clamping unit includes an upper fixed plate, a second left clamping block fixed on the upper fixed plate, and a second right clamping block slidingly arranged on the upper fixed plate through a transverse upper slide rail structure.

[0010] Preferably, the opposite surfaces of the first left clamping block and the first right clamping block and the opposite surfaces of the second left clamping block and the second right clamping block are provided with clamping teeth for clamping the sample.

[0011] Preferably, the opening control unit is an electronic vernier caliper fixed on the side wall of the box, and the lower part of the caliper of the electronic vernier caliper is fixed on the upper fixed frame.

[0012] Preferably, the opening degree control unit comprises a displacement sensor fixed on the side wall of the box above the upper fixed frame, and the lower end of the measuring rod of the displacement sensor is fixed on the upper fixed frame.

[0013] The test method for the rock mass structure surface dry-wet cycle test by using the test device comprises the following steps:

[0014] S1, first, design a specific test scheme, including the dynamic water pressure, dynamic water flow rate, dynamic water temperature, primary saturation time, drying temperature, primary drying time and dry-wet cycle number required in the test process, and add the water sample required in the test to the dynamic water control unit;

[0015] S2, fix the cut rock mass structure surface sample on the sample holder, then control the opening degree between the upper and lower two parts of the sample by adjusting the height of the upper fixed frame, fix the upper fixed frame on the vertical slide rail structure through a screw, and record the opening degree data by the controller through the opening degree control unit;

[0016] S3, according to the test scheme, perform the water saturation treatment on the rock mass structure surface sample: close the drying unit, open the first electromagnetic valve, close the second and fourth electromagnetic valves, and start the dynamic water control unit through the digital control system, so that the dynamic water flow required in the test flows from the water outlet pipe of the water tank into the test tank, the rock mass structure surface sample is subjected to water saturation treatment, and the dynamic water flow is circulated by flowing into the water tank through the test tank drain pipe;

[0017] S4, according to the test scheme, perform the drying treatment on the rock mass structure surface sample: close the dynamic water control unit, open the second and fourth electromagnetic valves, close the first electromagnetic valve, and start the drying unit through the digital control system, first perform the residual moisture drying, set the additional drying time according to the requirement, close the third electromagnetic valve after the water is drained, and perform the drying treatment on the rock mass structure surface sample;

[0018] S5, according to the test scheme, repeat steps S3-S4 through the digital control system until the dry-wet cycle test number required in the test, finally, the dry-wet cycle test is completed, and subsequent related test operations and experimental data measurement are performed.

[0019] The test device of the present application is used to fix each test sample on the test sample holder in the placing cavity, then control the opening between the upper and lower parts of the test sample by adjusting the height of the upper fixing holder, fix the upper fixing holder on the vertical slide rail structure through the screw, record the opening data by the opening control unit of the controller, then carry out the saturation of circulating water and the drying and wetting cycle process of air, in which the controller can monitor the flow rate, water pressure, water temperature and the temperature of air through the temperature sensor, pressure sensor and flow rate sensor, and control the temperature, pressure, flow rate and other parameters of water through the first electromagnetic valve, second electromagnetic valve, electric heater, water pump and drying machine, control the temperature and flow rate of drying air, and multiple test samples can be tested at the same time.

[0020] Compared with the prior test device, the present application has the following advantages:

[0021] (1) In the process of the dry-wet cycle test of the rock mass structure surface sample, the present application can quantitatively simulate different dynamic water pressure, dynamic water flow rate, dynamic water temperature and rock mass structure surface opening by digital system control setting, and carry out multiple dry-wet cycles.

[0022] (2) The present application separates each test sample, individually sets the placing cavity of each test sample, the volume of the single placing cavity is smaller, the water demand is smaller, and the required placing cavity can be supplied with water and dried according to the requirement, which reduces the loss of dynamic water pressure, water temperature and flow rate, so that the rock mass structure surface sample is subjected to the predetermined dynamic water action.

[0023] (3) The test device of the present application has simple structure, is easy to adjust and operate, and can simultaneously carry out dry-wet cycle test on multiple rock mass structure surface samples, thereby saving the time required for repeated test. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 Fig. 1 is a structural schematic view of the rock mass structure surface dry-wet cycle test device under dynamic water pressure of the present application;

[0025] Fig. 2 Fig. 4 is a structural schematic view of the single placing cavity in the test box of the present application. DETAILED DESCRIPTION

[0026] The present application will be further described below in combination with the drawings, and the protection content of the present application is not limited to the following embodiments.

[0027] A rock mass structure surface dry-wet cycle test device under dynamic water pressure, as shown in Figs. 1-2As shown, including the test box for placing the sample, the dynamic water control unit, the drying unit, the opening control unit and the digital control system, the test box includes a box body 1, a plurality of horizontal partitions 15 which divide the box body into multiple layers of placing cavities from bottom to top in the vertical direction, and a sample holder provided in the corresponding placing cavity. In this embodiment, each layer of placing cavities is separated into at least two independent placing cavities by a vertical partition 25. The sample holder includes a lower fixed holder fixed on the upper surface of the corresponding horizontal partition and an upper fixed holder provided on the side wall of the box body through a vertical slide rail structure 6. The upper and lower fixed holders have a test box air outlet 7 and a test box water outlet 8 therebetween. In this embodiment, the lower fixed holder includes a lower plate 10' fixed on the upper surface of the corresponding horizontal partition and a lower clamping unit fixed on the lower plate. The lower clamping unit includes a lower fixed plate 11', a first left clamping block 12' fixed on the lower fixed plate, and a first right clamping block 27' slidingly provided on the lower fixed plate through a transverse lower slide rail structure 14'. The upper fixed holder includes an upper plate 10 fixed on the side wall of the box body through a vertical slide rail structure 6 and an upper clamping unit fixed on the lower surface of the upper plate. The upper clamping unit includes an upper fixed plate 11, a second left clamping block 12 fixed on the upper fixed plate, and a second right clamping block 27 slidingly provided on the upper fixed plate through a transverse upper slide rail structure 14. The opposite surfaces of the first left and right clamping blocks and the opposite surfaces of the second left and right clamping blocks each have a clamping tooth 13 for clamping the sample 21.

[0028] The dynamic water control unit of this embodiment includes a water tank 20, an electric heater provided in the water tank, a water pump, and a water tank water outlet pipe 19 connected with each placing cavity. Each water tank water outlet pipe has a first electromagnetic valve 3 thereon. The drying unit includes a drying machine and a drying machine air outlet pipe 18 connected with each placing cavity. The drying machine is provided in a cover body 2, and the cover body has a drying unit air inlet 24 thereon. The drying machine air outlet pipe has a second electromagnetic valve 17 provided therein. The water tank is connected with the test box water outlet through a test box drain pipe 9. The test box drain pipe has a third electromagnetic valve 22 provided thereon. The test box air outlet has a fourth electromagnetic valve provided thereon. The opening control unit is a mechanical vernier caliper 4 and a camera 5 fixed on the side wall of the box body. The lower part of the caliper of the mechanical vernier caliper is fixed on the upper fixed holder.

[0029] The digital control system includes a controller 26, temperature sensors 16 provided in each placing cavity for monitoring the drying temperature and the circulating water temperature, a pressure sensor 23, and a flow rate sensor 28. The temperature sensors 16 are located in front of the corresponding water tank water outlet pipes and drying machine air outlet pipes. The controller 26 is provided on the top of the box body. The controller is connected with the temperature sensors, the pressure sensor, the flow rate sensor, the opening control unit, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the electric heater, the water pump, and the drying machine, respectively. The camera reads the reading of the mechanical vernier caliper and uploads it to the controller to obtain the sample opening data.

[0030] In other embodiments, different from the above embodiments, the opening degree control unit comprises a displacement sensor fixed on the side wall of the box above the upper fixed frame, and the lower end of the measuring rod of the displacement sensor is fixed on the upper fixed frame; in other embodiments, different from the above embodiments, the opening degree control unit is an electronic vernier caliper, and the lower part of the caliper of the electronic vernier caliper is fixed on the upper fixed frame.

[0031] The specific implementation steps of the test performed by using the test device of the above embodiments are as follows:

[0032] S1, first, design a specific test scheme, including the dynamic water pressure, dynamic water flow rate, dynamic water temperature, primary saturation time, drying temperature, primary drying time and dry-wet cycle number required in the test process, and add the water sample required by the test to the dynamic water control unit;

[0033] S2, fix the cut rock mass structure sample on the sample holder, then control the opening degree between the upper and lower two parts of the sample by adjusting the height of the upper fixed frame, fix the upper fixed frame on the vertical sliding rail structure through the screw, and record the opening degree data by the controller through the opening degree control unit;

[0034] S3, according to the test scheme, perform the water saturation treatment on the rock mass structure sample: close the drying unit, open the first electromagnetic valve, close the second and fourth electromagnetic valves, and start the dynamic water control unit through the digital control system, so that the dynamic water flow required by the test flows from the water outlet pipe of the water tank into the test tank, and the rock mass structure sample is subjected to water saturation treatment, and the water flow is circulated through the water tank drain pipe into the water tank;

[0035] S4, according to the test scheme, perform the drying treatment on the rock mass structure sample: close the dynamic water control unit, open the second and fourth electromagnetic valves, close the first electromagnetic valve, and start the drying unit through the digital control system, first perform the residual moisture drying, set the additional drying time according to the requirement, close the third electromagnetic valve after the water is drained, and perform the drying treatment on the rock mass structure sample;

[0036] S5, according to the test scheme, repeat steps S3-S4 through the digital control system to the required dry-wet cycle test number, and finally the dry-wet cycle test is completed, and subsequent related test operations and experimental data measurement are performed.

Claims

1. A device for testing rock mass structural plane under dry-wet cycle under hydrodynamic pressure, characterized in that: The test box includes a box body, a plurality of horizontal partitions that divide the box body into a plurality of layers of placement cavities from bottom to top in a vertical direction, and a sample holder provided in the placement cavities. The sample holder includes a lower fixed holder fixed to the upper surface of the corresponding horizontal partition and an upper fixed holder provided on the side wall of the box body through a vertical sliding rail structure. The upper and lower fixed holders have a test box air outlet and a test box water outlet therebetween. The dynamic water control unit includes a water tank, an electric heater provided in the water tank, a water pump, and a water tank water outlet pipe connected to each of the placement cavities. Each of the water tank water outlet pipes has a first electromagnetic valve. The drying unit includes a drying machine and a drying machine air outlet pipe connected to each of the placement cavities. The drying machine air outlet pipe is provided with a second electromagnetic valve. The water tank is connected to the test box water outlet through a test box drain pipe provided with a third electromagnetic valve. The test box air outlet is provided with a fourth electromagnetic valve. The opening control unit is fixed to the side wall of the box body above the upper fixed holder and has a lower end fixed to the upper fixed holder. The digital control system includes a controller, temperature sensors, pressure sensors, and flow rate sensors provided in each of the placement cavities for monitoring the drying temperature and the circulating water temperature. The temperature sensors are located in front of the corresponding water tank water outlet pipes and drying machine air outlet pipes. The controller is connected to the temperature sensors, pressure sensors, flow rate sensors, opening control unit, first electromagnetic valve, second electromagnetic valve, third electromagnetic valve, fourth electromagnetic valve, electric heater, water pump, and drying machine.

2. The apparatus according to claim 1, wherein the apparatus is characterized by: The lower fixed holder includes a lower plate fixed to the upper surface of the corresponding horizontal partition and a lower clamping unit fixed to the lower plate. The lower clamping unit includes a lower fixed plate, a first left clamping block fixed to the lower fixed plate, and a first right clamping block slidingly provided on the lower fixed plate through a horizontal lower sliding rail structure. The upper fixed holder includes an upper plate fixed to the side wall of the box body through a vertical sliding rail structure and an upper clamping unit fixed to the lower surface of the upper plate. The upper clamping unit includes an upper fixed plate, a second left clamping block fixed to the upper fixed plate, and a second right clamping block slidingly provided on the upper fixed plate through a horizontal upper sliding rail structure.

3. The apparatus according to claim 1, wherein the apparatus is characterized by: The opposite surfaces of the first left and right clamping blocks and the opposite surfaces of the second left and right clamping blocks each have clamping teeth for clamping the sample.

4. The apparatus according to claim 2 or 3, characterized in that: The opening control unit is an electronic vernier caliper fixed to the side wall of the box body. The lower part of the caliper of the electronic vernier caliper is fixed to the upper fixed holder.

5. The apparatus according to claim 2 or 3, characterized in that: The opening control unit includes a displacement sensor fixed to the side wall of the box body above the upper fixed holder. The lower end of the measuring rod of the displacement sensor is fixed to the upper fixed holder.

6. The apparatus according to claim 1, characterized in that: Each layer of placement cavities is divided into at least two independent placement cavities by a vertical partition.

7. A test method for performing a dry-wet cycle test on a rock mass structural plane using the test apparatus according to any one of claims 1 to 6, characterized in that The method includes the following steps: S1, first design a specific test plan, including the dynamic water pressure, dynamic water flow rate, dynamic water temperature, one-time saturation time, drying temperature, one-time drying time, and dry-wet cycle number required during the test, and adding a water sample required by the test in the dynamic water control unit; S2, the cut rock mass structure surface sample is fixed on the sample holder, then the opening between the upper and lower parts of the sample is controlled by adjusting the height of the upper fixing frame, the upper fixing frame is fixed on the vertical slide rail structure through the screw, and the opening data is recorded by the controller through the opening control unit; S3, according to the test scheme, the rock mass structure surface sample is subjected to saturated water treatment: the drying unit is closed, the first electromagnetic valve is opened, the second and fourth electromagnetic valves are closed, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the water flow is circulated through the water tank outlet pipe and the test tank, and the ​ ​

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