Internal pressure type consolidation test system for annular structure material

Abstract

The invention relates to the technical field of consolidation testing, in particular to an internal pressure type consolidation testing system for an annular structure material. The internal pressure type consolidation testing system comprises a base, a consolidation box, a hydraulic loading device, a digital measuring device and displacement sensors, the consolidation box comprises a rigid sample ring and an annular rubber film, and the multiple displacement sensors are evenly distributed in the axial direction of the inner ring wall of the annular rubber film; the digital measuring device is electrically connected with the displacement sensor, and the hydraulic loading device injects liquid into the annular rubber membrane through a hydraulic pipeline, so that the annular rubber membrane expands and deforms, and the annular rubber membrane and the rigid sample ring jointly complete solidification of the annular structure material. Through the internal pressure type consolidation box structure, the actual working condition of the annular structure material can be accurately fitted, and the compression performance change characteristics of the annular structure material in the consolidation process can be more accurately collected.

Description

Technical Field

[0001] The invention relates to the technical field of consolidation testing, and in particular to an internal pressure consolidation testing system for annular structural materials. Background Art

[0002] An oedometer is an industrial instrument used to measure the compressive properties of soil under different loads and confined conditions. Currently, there are two main types of oedometers used in the field of consolidation testing. One is a pneumatic oedometer, which pressurizes soil samples through pneumatic loads. The other is a single-lever oedometer, which pressurizes soil samples by placing weights. Both oedometers consolidate soil by applying axial pressure or confining pressure.

[0003] In the field of underground engineering and tunnel engineering design, the compression performance of annular structure soil is an important influencing factor. However, the traditional consolidation instrument cannot fit the actual working conditions of annular structure soil well, so that the test results often have a certain deviation from the actual situation. Therefore, how to design a test instrument with a simple structure, easy operation, and the ability to accurately measure the compression performance of annular structure soil is of great practical significance. Summary of the invention

[0004] In view of this, in order to overcome the defects in the above-mentioned prior art, the present invention provides an internal pressure consolidation test system for annular structure materials. It is used to simulate and study the change rules of soil settlement development, pore water pressure dissipation, compression performance, etc. during the consolidation process, so that technicians can more intuitively and accurately collect the compression performance change characteristics of annular structure saturated soft clay during consolidation.

[0005] To achieve the above-mentioned object, the present invention provides an internal pressure consolidation test system for annular structural materials, comprising a base, a consolidation box and a hydraulic loading device, wherein the bottom end of the consolidation box is fixedly arranged on the upper end of the base, and a fixing plate is detachably arranged on the upper end of the consolidation box.

[0006] The consolidation box comprises a rigid sample ring and an annular rubber membrane, wherein the annular rubber membrane is arranged inside the rigid sample ring and concentrically with the rigid sample ring, and an annular sample groove is formed between the inner wall of the rigid sample ring and the outer wall of the annular rubber membrane.

[0007] The annular rubber membrane comprises a hollow cylindrical body, an upper sealing layer and a lower sealing layer, the diameter of the upper sealing layer is the same as the outer diameter of the hollow cylindrical body, the diameter of the lower sealing layer is larger than the outer diameter of the hollow cylindrical body and smaller than the inner diameter of the rigid sample ring, a first through hole is opened in the middle of the upper sealing layer, a second through hole is opened in the middle of the lower sealing layer, and the diameter of the second through hole is larger than the diameter of the first through hole,

[0008] The hydraulic loading device may be in communication with the first through hole and the second through hole respectively through hydraulic pipelines.

[0009] Furthermore, the consolidation box also includes an upper pressing plate and a lower pressing plate, and the middle parts of the upper pressing plate and the lower pressing plate are each provided with a through hole, the diameter of the through hole matches the outer diameter of the rigid sample ring, and the two ends of the rigid sample ring are fixedly connected to the upper pressing plate and the lower pressing plate respectively through the through holes, and the top end of the rigid sample ring does not exceed the upper end part of the upper pressing plate, and the bottom end of the rigid sample ring does not exceed the lower end part of the lower pressing plate, and the upper pressing plate is detachably fixedly connected to the lower end of the fixing plate, and the upper end of the annular rubber membrane is sealed and squeezed between the upper end surface of the upper pressing plate and the lower end surface of the fixing plate, and a third through hole is set in the middle part of the fixing plate, and the third through hole is coaxially arranged with the first through hole.

[0010] Furthermore, the base includes a bottom plate, a cylinder and a workbench, the cylinder is fixedly arranged on the upper end of the bottom plate, the workbench is fixedly arranged on the upper end of the cylinder, both ends of the cylinder are sealed from the bottom plate and the workbench, a fourth through hole is arranged in the middle of the workbench, the fourth through hole is connected to the cylinder, the fourth through hole is coaxial with the second through hole, the lower clamping plate is detachably fixedly connected to the upper end of the workbench, and the lower end of the annular rubber membrane is sealed and squeezed between the lower clamping plate and the workbench.

[0011] Furthermore, the hydraulic loading device includes a hydraulic control box, a liquid outlet control valve, a liquid inlet control valve, a liquid inlet flow sensor and a liquid outlet flow sensor, an inlet pipeline and an outlet pipeline. The liquid inlet control valve and the liquid inlet flow sensor are both arranged on the inlet pipeline, and the liquid inlet control valve and the liquid outlet flow sensor are both arranged on the outlet pipeline. The hydraulic control box is provided with a liquid outlet control button, a liquid inlet control button, a liquid outlet flow display and a liquid inlet flow display. The liquid inlet control button is used to control the liquid inlet control valve, and the liquid outlet control button is used to control the liquid outlet control valve. The liquid inlet flow display is electrically connected to the liquid inlet flow sensor, and the liquid inlet flow display is electrically connected to the liquid outlet flow sensor. The two ends of the water inlet pipeline are respectively connected to the cylinder and the hydraulic control box, one end of the outlet pipeline passes through the third through hole on the fixed plate and is connected to the first through hole, and the other end of the outlet pipeline is connected to the hydraulic control box.

[0012] Furthermore, the present invention also includes a digital measuring device and a displacement sensor. The plurality of displacement sensors are evenly distributed along the inner ring wall of the annular rubber membrane, and the digital measuring device is electrically connected to the displacement sensor.

[0013] Furthermore, the present invention also includes a fixing rod, the number of which is 2-4, the bottom end of the fixing rod is fixedly arranged on the upper end of the workbench, the upper end of the fixing rod is provided with a plurality of limiting holes, a fifth through hole is arranged on the fixing plate, a sixth through hole is arranged on the side of the fixing plate, the sixth through hole is connected with the fifth through hole, the fixing plate can be sleeved on the upper end of the fixing rod through the fifth through hole, and a limiting pin is passed through the sixth through hole and the fifth through hole to fix the fixing plate and the fixing rod.

[0014] The fixing rod is disposed on the workbench at a position such that when the fixing plate is sleeved on the upper end of the fixing rod, the third through hole in the fixing plate is coaxially aligned with the first through hole in the upper sealing layer.

[0015] The present invention also provides a method for using an internal pressure consolidation test system for annular structural materials, comprising the following steps:

[0016] S1. The lower clamping plate of the consolidation box is fixedly mounted on the upper end surface of the workbench by fasteners, and the second through hole provided on the lower sealing layer is coaxially aligned with the fourth through hole provided on the workbench;

[0017] S2. Install a permeable stone at the bottom of the sample groove, place the sample into the sample groove in the consolidation box, and make the sample fully contact with the inner wall of the sample ring and the outer wall of the annular rubber membrane, and install a permeable stone on the upper end of the installed sample;

[0018] S3. The fixing plate is sleeved on the upper end of the fixing rod, the upper pressing plate of the consolidation box is fixedly mounted on the lower end surface of the fixing plate by fasteners, and the stop pin is passed through the sixth through hole and the fifth through hole to fix the fixing plate and the fixing rod;

[0019] S4. Connect the water inlet pipe to the cylinder, pass the water outlet pipe through the third through hole in the fixing plate and communicate with the first through hole in the upper sealing layer;

[0020] S5. Start the hydraulic loading device, inject liquid into the annular rubber membrane in the consolidation box, collect the displacement of the annular rubber membrane in the diameter direction through the displacement sensor, and collect the liquid flow entering the annular rubber membrane and the liquid flow discharged from the annular rubber membrane through the liquid inlet flow sensor and the liquid outlet flow sensor respectively; use the digital measuring device to monitor and analyze the data collected by the displacement sensor, the liquid inlet flow sensor and the liquid outlet flow sensor in real time, compare the consolidation compression volume of the sample with the flow volume of the liquid inlet and outlet in real time, and adjust the liquid outlet control button and the liquid inlet control button in real time according to the comparison result to control the inlet and outlet flow of the liquid.

[0021] The beneficial technical effect brought by the technical solution of the present invention is that the present invention can accurately fit the actual working conditions of the annular structure material through the internal pressure consolidation box structure, and more accurately collect the compression performance change characteristics of the annular structure material during the consolidation process. The present invention can more evenly monitor the displacement changes of the annular rubber membrane at different positions through the evenly distributed displacement sensors, so as to more accurately evaluate the consolidation behavior of the sample; multiple sensors can provide data redundancy. If a sensor fails, other sensors can still provide reliable data. Multi-point monitoring can improve measurement accuracy. By comparing the displacement data at different positions, the average consolidation amount of the soil sample can be more accurately calculated. The multi-point sensors are helpful to analyze the uniformity of the soil sample during the consolidation process and detect whether there is a local uneven consolidation phenomenon. The present invention uses the data collected by the displacement sensor and the liquid inlet / outlet flow sensor monitored in real time by the digital measuring device, and compares the consolidation compression volume of the sample with the flow volume of the liquid inlet and outlet in real time, and adjusts the liquid outlet control button and the liquid inlet control button in real time according to the comparison result, controls the inlet flow and outlet flow of the liquid, and maintains the stability of the liquid pressure, thereby ensuring the uniformity of the sample consolidation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to obtain the above and other advantages and features of the present invention, the present invention summarized above will be described in more detail below with reference to the specific embodiments of the present invention shown in the accompanying drawings. It should be understood that these drawings only show typical embodiments of the present invention and should not be regarded as limiting the scope of the present invention. Through the use of the accompanying drawings, the present invention will be described and explained in more detail; in the accompanying drawings:

[0023] Figure 1 It is a schematic diagram of the overall structure of an internal pressure consolidation test system for annular structural materials of the present invention;

[0024] Figure 2 It is a partial top view of an internal pressure consolidation test system for annular structural materials of the present invention;

[0025] Figure 3 It is the front view of section aa';

[0026] Figure 4 is the side view of section bb';

[0027] Figure 5 It is a schematic diagram of the consolidation box structure of the present invention.

[0028] In the figure: 1-base plate, 2-cylinder, 3-workbench, 4-lower clamping plate, 5-fixing rod, 6-consolidation box, 6a-rigid sample ring, 7-upper clamping plate, 8-fixing plate, 9-limiting pin, 10-fastener, 11-inlet pipeline, 12-outlet pipeline, 13-hydraulic loading device, 14-liquid outlet control button, 15-liquid outlet flow display, 16-liquid inlet control button, 17-liquid inlet flow display, 18-digital measuring device, 19-through hole two, 20-annular rubber membrane, 21-displacement sensor, 22-sample. DETAILED DESCRIPTION

[0029] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. Directional terms such as "front", "back", "left", and "right" in the following description are not to be interpreted as limitations of the present invention. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0030] In order to make the purpose, technical scheme and beneficial effects of the present invention clearer, the following Figure 1-5 The internal pressure consolidation testing system for annular structure materials provided by the present invention is further described in detail.

[0031] Please see attached Figure 1-5As shown, an embodiment of the present invention provides an internal pressure consolidation test system for annular structural materials, including a base, a consolidation box 6 and a hydraulic loading device 13, the bottom end of the consolidation box 6 is fixedly arranged on the upper end of the base, and a fixing plate 8 is detachably fixedly arranged on the upper end of the consolidation box 6, and the consolidation box 6 includes a rigid sample ring 6a and an annular rubber membrane 20, the annular rubber membrane 20 is arranged inside the rigid sample ring 6a and concentrically arranged with the rigid sample ring 6a, and an annular sample groove is formed between the inner wall of the rigid sample ring 6a and the outer wall of the annular rubber membrane 20. The annular sample groove is used to fill the sample 22, such as soil and other materials. The annular rubber membrane 20 can expand and deform after the liquid is injected, and under the joint action of the rigid sample ring 6a, the sample inside the consolidation box can be squeezed and consolidated, thereby realizing the consolidation of the annular structure sample. The fixing plate 8 is used to limit the sample 22 and the annular rubber membrane during the consolidation test, so that the sample 22 is only consolidated in the sample groove.

[0032] The annular rubber membrane 20 is a composite rubber material in which a certain proportion of carbon fiber reinforcement is added to a rubber matrix, and an appropriate amount of large-particle carbon black is added as a filler. An integrated forming structure is used on the processing mold to ensure high density and uniform thickness distribution during the forming process. The annular rubber membrane 20 of the present invention has a larger elastic modulus and a smaller thickness than traditional rubber / latex materials, and can effectively transmit fluid pressure to the annular structure sample.

[0033] The annular rubber membrane 20 includes a hollow cylindrical body, an upper sealing layer and a lower sealing layer. The diameter of the upper sealing layer is the same as the outer diameter of the hollow cylindrical body, the diameter of the lower sealing layer is larger than the outer diameter of the hollow cylindrical body and smaller than the inner diameter of the rigid sample ring 6a, a first through hole is opened in the middle of the upper sealing layer, a second through hole is opened in the middle of the lower sealing layer, the diameter of the second through hole is larger than the diameter of the first through hole, and the hydraulic loading device 13 can be connected to the first through hole and the second through hole respectively through a hydraulic pipeline. The hydraulic loading device 13 can inject liquid into the hollow cylindrical body of the annular rubber membrane 20 through the second through hole opened in the middle of the lower sealing layer, and can discharge the liquid in the hollow cylindrical body through the first through hole opened in the middle of the upper sealing layer, and return it to the hydraulic loading device 13.

[0034] As a further preferred embodiment, the consolidation box 6 in the present invention also includes an upper pressing plate 7 and a lower pressing plate 4, and the middle parts of the upper pressing plate 7 and the lower pressing plate 4 are both provided with through holes, and the diameters of the through holes match the outer diameter of the rigid sample ring 6a, and the two ends of the rigid sample ring 6a are respectively fixedly connected to the upper pressing plate 7 and the lower pressing plate 4 through the through holes, and the top end of the rigid sample ring 6a does not exceed the upper end part of the upper pressing plate 7, and the bottom end of the rigid sample ring 6a does not exceed the lower end part of the lower pressing plate 4, and the upper pressing plate 7 is detachably fixedly connected to the lower end of the fixing plate 8 by a fastener 10, and the fastener 10 can be a screw, a bolt, etc., and the upper end of the annular rubber membrane 20 is sealed and squeezed between the upper end surface of the upper pressing plate 7 and the lower end surface of the fixing plate 8, and a third through hole is set in the middle part of the fixing plate 8, and the third through hole is coaxially arranged with the first through hole. The third through hole in the fixing plate 8 is used to penetrate and set a hydraulic pipeline. The coaxial arrangement of the third through hole and the first through hole facilitates fluid communication between the hydraulic pipeline and the first through hole. Since the upper end of the annular rubber membrane 20 is sealed and squeezed between the upper end surface of the upper clamping plate 7 and the lower end surface of the fixing plate 8, after the hydraulic pipeline is fluidically connected to the first through hole, the sealing performance during fluid transmission can be ensured to avoid fluid leakage.

[0035] As a further preferred embodiment, the upper clamping plate 7, the lower clamping plate 4 and the rigid sample ring 6a in the present invention can be integrated.

[0036] As a further preferred embodiment, the base in the present invention comprises a bottom plate 1, a cylinder 2 and a workbench 3, the cylinder 2 is fixedly arranged at the upper end of the bottom plate 1, the workbench 3 is fixedly arranged at the upper end of the cylinder 2, both ends of the cylinder 2 are sealed with the bottom plate 1 and the workbench 3, a fourth through hole is arranged in the middle of the workbench 3, the fourth through hole is communicated with the cylinder 2, the fourth through hole is coaxially arranged with the second through hole, the lower clamping plate 4 is detachably fixedly connected to the upper end of the workbench 3 by a fastener 10, and the lower end of the annular rubber membrane 20 is sealed and squeezed between the lower end surface of the lower clamping plate 4 and the upper end surface of the workbench 3. The cylinder 2 can be a cylindrical structure with two ends through, and the two ends of the cylinder 2 are respectively welded to the bottom plate 1 and the workbench 3. The cylinder 2 is connected to the hydraulic loading device 13 through the hydraulic pipeline, and the fluid is injected into the annular rubber membrane 20 through the hydraulic pipeline, the cylinder 2, the fourth through hole and the second through hole. Since the lower end of the annular rubber membrane 20 is sealed and squeezed between the lower end surface of the lower pressing plate 4 and the upper end surface of the workbench 3, the sealing performance during fluid transmission can be ensured to avoid fluid leakage.

[0037] As a further preferred embodiment, the hydraulic loading device 13 in the present invention includes a hydraulic control box, a liquid outlet control valve, a liquid inlet control valve, a liquid inlet flow sensor and a liquid outlet flow sensor, an inlet pipe 11 and an outlet pipe 12, wherein the liquid inlet control valve and the liquid inlet flow sensor are both arranged on the inlet pipe 11, the liquid inlet control valve and the liquid outlet flow sensor are both arranged on the outlet pipe 12, and the hydraulic control box is provided with a liquid outlet control button 14, a liquid inlet control button 16, a liquid outlet flow display 15 and a liquid inlet A flow indicator 17, the liquid inlet control button 16 is used to control the liquid inlet control valve, the liquid outlet control button 14 is used to control the liquid outlet control valve, the liquid inlet flow indicator 17 is electrically connected to the liquid inlet flow sensor, the liquid outlet flow indicator 15 is electrically connected to the liquid outlet flow sensor, the two ends of the water inlet pipe 11 are respectively connected to the cylinder 2 and the hydraulic control box, one end of the water outlet pipe 12 passes through the third through hole on the fixing plate 8 and is connected to the first through hole, and the other end of the water outlet pipe 12 is connected to the hydraulic control box.

[0038] In the process of the consolidation test of the present invention, the liquid outlet control valve is used to control the opening and closing of the water outlet pipeline 12 and the adjustment of the size of the flow opening, and the liquid inlet control valve is used to control the opening and closing of the water inlet pipeline 11 and the adjustment of the size of the flow opening. The liquid inlet flow sensor is used to collect the flow parameters in the water inlet pipeline 11 and transmit them to the liquid inlet flow display 17. The liquid outlet flow sensor is used to collect the flow parameters in the water outlet pipeline 12 and transmit them to the liquid outlet flow display 15.

[0039] As a further preferred embodiment, the present invention also includes a fixing rod 5, the number of the fixing rods 5 is 2-4, the bottom end of the fixing rod 5 is fixedly arranged on the upper end of the workbench 3, the upper end of the fixing rod 5 is provided with a plurality of limiting holes, a fifth through hole is arranged on the fixing plate 8, a sixth through hole is arranged on the side of the fixing plate 8, the sixth through hole is connected with the fifth through hole, the fixing plate 8 can be sleeved on the upper end of the fixing rod 5 through the fifth through hole, and a limiting pin 9 is passed through the sixth through hole and the fifth through hole to fix the fixing plate and the fixing rod.

[0040] The fixing rod 5 is arranged on the workbench 3 in such a position that when the fixing plate 8 is sleeved on the upper end of the fixing rod 5, the third through hole in the fixing plate 8 is coaxially aligned with the first through hole in the upper sealing layer. The fixing rod 5 is used to limit the fixing plate 8 in the horizontal direction.

[0041] As a further preferred embodiment, the present invention also includes a digital measuring device 18 and a displacement sensor 21. The number of the displacement sensors 21 is multiple, and the multiple displacement sensors 21 are evenly distributed axially along the inner ring wall of the annular rubber membrane 20. The digital measuring device 18 is electrically connected to the displacement sensor 21.

[0042] The displacement sensor 21 is used to collect the diameter change parameters of the annular rubber membrane 20 in real time during the consolidation test, and send the diameter change parameters to the digital measurement device 18 in real time for calculating the consolidation compression volume of the sample. The displacement sensors 21 are evenly distributed along the inner ring wall of the annular rubber membrane 20 in the axial direction, and the displacement changes of the annular rubber membrane 20 at different axial positions can be evenly monitored, so as to more accurately evaluate the consolidation behavior of the sample 22 and detect whether there is local uneven consolidation. Setting up multiple displacement sensors 21 can provide data redundancy. If a sensor fails, other sensors can still provide reliable data. Multi-point monitoring can improve measurement accuracy. By comparing the displacement data at different positions, the average consolidation amount of the soil sample can be more accurately calculated.

[0043] The digital measuring device 18 can monitor and analyze the data collected by the displacement sensor 21, the liquid inlet flow sensor and the liquid outlet flow sensor in real time, compare the consolidation compression volume of the sample 22 with the flow volume of the liquid inlet and outlet in real time, and adjust the liquid outlet control button 14 and the liquid inlet control button 16 in real time according to the comparison result to control the inlet flow and outlet flow of the liquid, thereby maintaining the stability of the liquid pressure and making the sample 22 more uniform during the consolidation process.

[0044] The present invention also provides a method for using an internal pressure consolidation test system for annular structural materials, comprising the following steps:

[0045] S1. The lower clamping plate 4 of the consolidation box 6 is fixedly mounted on the upper end surface of the workbench 3 by the fastener 10, and the second through hole provided on the lower sealing layer is coaxially aligned with the fourth through hole provided on the workbench 3;

[0046] S2. Install a permeable stone at the bottom of the sample groove, load the sample 22 into the sample groove in the consolidation box 6, and make the sample 22 fully contact with the inner wall of the sample ring 6a and the outer wall of the annular rubber membrane 20, and install a permeable stone on the upper end of the installed sample 22;

[0047] S3. The fixing plate 8 is sleeved on the upper end of the fixing rod 5, the upper pressing plate 7 of the consolidation box 6 is fixedly mounted on the lower end surface of the fixing plate 8 through the fastener 10, and the stop pin 9 is passed through the sixth through hole and the fifth through hole to fix the fixing plate 8 and the fixing rod 5;

[0048] S4. Connect the water inlet pipe 11 to the cylinder 2, and pass the water outlet pipe 12 through the third through hole in the fixing plate 8 and communicate with the first through hole in the upper sealing layer;

[0049] S5. Start the hydraulic loading device 13, inject liquid into the annular rubber membrane 20 in the consolidation box 6, collect the displacement of the annular rubber membrane 20 in the diameter direction through the displacement sensor 21, and collect the liquid flow entering the annular rubber membrane 20 and the liquid flow discharged from the annular rubber membrane 20 through the liquid inlet flow sensor and the liquid outlet flow sensor respectively; monitor and analyze the data collected by the displacement sensor 21, the liquid inlet flow sensor and the liquid outlet flow sensor in real time through the digital measuring device 18, and compare the consolidation compression volume of the sample 22 with the flow volume of the liquid inlet and outlet in real time, and adjust the liquid outlet control button 14 and the liquid inlet control button 16 in real time according to the comparison result to control the inlet and outlet flow of the liquid.

[0050] The beneficial technical effect brought by the technical solution of the present invention is that the present invention can accurately fit the actual working conditions of the annular structure material through the internal pressure consolidation box structure, and more accurately collect the compression performance change characteristics of the annular structure material during the consolidation process. The present invention can more evenly monitor the displacement changes of the annular rubber membrane at different positions through the evenly distributed displacement sensors, so as to more accurately evaluate the consolidation behavior of the sample; multiple sensors can provide data redundancy. If a sensor fails, other sensors can still provide reliable data. Multi-point monitoring can improve measurement accuracy. By comparing the displacement data at different positions, the average consolidation amount of the soil sample can be more accurately calculated. The multi-point sensors are helpful to analyze the uniformity of the soil sample consolidation process and detect whether there is a local uneven consolidation phenomenon. The present invention uses the data collected by the displacement sensor and the liquid inlet / outlet flow sensor monitored in real time by the digital measuring device, and compares the consolidation compression volume of the sample with the flow volume of the liquid inlet and outlet in real time, and adjusts the liquid outlet control button and the liquid inlet control button in real time according to the comparison result, controls the inlet flow and outlet flow of the liquid, and maintains the stability of the liquid pressure, thereby ensuring the uniformity of the sample consolidation.

[0051] The above embodiments are preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any person skilled in the art may make some improvements without departing from the scope of the present invention, that is, any equivalent improvements made according to the present invention should be covered by the scope of the present invention.

Claims

1. An internal pressure consolidation test system for annular structural materials, characterized in that: It comprises a base, a consolidation box and a hydraulic loading device, wherein the bottom end of the consolidation box is fixedly arranged on the upper end of the base, and a fixing plate is detachably arranged on the upper end of the consolidation box; The consolidation box comprises a rigid sample ring and an annular rubber membrane, wherein the annular rubber membrane is arranged inside the rigid sample ring and concentrically with the rigid sample ring, and an annular sample groove is formed between the inner wall of the rigid sample ring and the outer wall of the annular rubber membrane. The annular rubber membrane comprises a hollow cylindrical body, an upper sealing layer and a lower sealing layer, the diameter of the upper sealing layer is the same as the outer diameter of the hollow cylindrical body, the diameter of the lower sealing layer is larger than the outer diameter of the hollow cylindrical body and smaller than the inner diameter of the rigid sample ring, a first through hole is opened in the middle of the upper sealing layer, a second through hole is opened in the middle of the lower sealing layer, and the diameter of the second through hole is larger than the diameter of the first through hole; The hydraulic loading device may be in communication with the first through hole and the second through hole respectively through hydraulic pipelines.

2. The internal pressure consolidation test system for annular structural materials according to claim 1, characterized in that: The consolidation box also includes an upper pressing plate and a lower pressing plate, wherein the middle parts of the upper pressing plate and the lower pressing plate are both provided with through holes, the diameter of the through holes matches the outer diameter of the rigid sample ring, and the two ends of the rigid sample ring are respectively fixedly connected to the upper pressing plate and the lower pressing plate through the through holes, and the top end of the rigid sample ring does not exceed the upper end part of the upper pressing plate, and the bottom end of the rigid sample ring does not exceed the lower end part of the lower pressing plate; The upper pressing plate is detachably fixedly connected to the lower end of the fixing plate, and the upper end of the annular rubber membrane is sealed and squeezed between the upper end surface of the upper pressing plate and the lower end surface of the fixing plate; A third through hole is disposed in the middle of the fixing plate, and the third through hole is coaxially disposed with the first through hole.

3. The internal pressure consolidation test system for annular structural materials according to claim 2, characterized in that: The base comprises a bottom plate, a cylinder and a workbench; The cylinder is fixedly arranged on the upper end of the bottom plate, the workbench is fixedly arranged on the upper end of the cylinder, and both ends of the cylinder are sealed with the bottom plate and the workbench; A fourth through hole is provided in the middle of the workbench, the fourth through hole is communicated with the cylinder, and the fourth through hole is coaxial with the second through hole; The lower pressing plate is detachably fixedly connected to the upper end of the workbench, and the lower end of the annular rubber membrane is sealed and squeezed between the lower pressing plate and the workbench.

4. The internal pressure consolidation test system for annular structural materials according to claim 3, characterized in that: The hydraulic loading device includes a hydraulic control box, a liquid outlet control valve, a liquid inlet control valve, a liquid inlet flow sensor, a liquid outlet flow sensor, a water inlet pipeline and a water outlet pipeline. The liquid inlet control valve and the liquid inlet flow sensor are both arranged on the water inlet pipeline, and the liquid inlet control valve and the liquid outlet flow sensor are both arranged on the water outlet pipeline. The hydraulic control box is provided with a liquid outlet control button, a liquid inlet control button, a liquid outlet flow indicator and a liquid inlet flow indicator. The liquid inlet control button is used to control the liquid inlet control valve. The liquid outlet control button is used to control the liquid outlet control valve. The liquid inlet flow indicator is electrically connected to the liquid inlet flow sensor. The liquid inlet flow indicator is electrically connected to the liquid outlet flow sensor. Both ends of the water inlet pipe are respectively connected to the cylinder and the hydraulic control box, one end of the water outlet pipe passes through the third through hole on the fixed plate and is connected to the first through hole, and the other end of the water outlet pipe is connected to the hydraulic control box.

5. The internal pressure consolidation test system for annular structural materials according to any one of claims 1 to 4, characterized in that: It also includes a digital measuring device and a displacement sensor. The multiple displacement sensors are evenly distributed along the inner ring wall of the annular rubber membrane, and the digital measuring device is electrically connected to the displacement sensor.

6. The internal pressure consolidation test system for annular structural materials according to claim 5, characterized in that: It also includes a fixing rod, the number of which is 2-4, the bottom end of the fixing rod is fixedly arranged on the upper end of the workbench, the upper end of the fixing rod is provided with a plurality of limiting holes, a fifth through hole is arranged on the fixing plate, a sixth through hole is arranged on the side of the fixing plate, the sixth through hole is communicated with the fifth through hole, the fixing plate can be sleeved on the upper end of the fixing rod through the fifth through hole, and a limiting pin is passed through the sixth through hole and the fifth through hole to fix the fixing plate and the fixing rod.

7. A method for using the internal pressure consolidation test system for annular structural materials according to claim 6, characterized in that: The following steps are included: S1. The lower clamping plate of the consolidation box is fixedly mounted on the upper end surface of the workbench by fasteners, and the second through hole provided on the lower sealing layer is coaxially aligned with the fourth through hole provided on the workbench; S2. Install a permeable stone at the bottom of the sample groove, place the sample into the sample groove in the consolidation box, and make the sample fully contact with the inner wall of the sample ring and the outer wall of the annular rubber membrane, and install a permeable stone on the upper end of the installed sample; S3. The fixing plate is sleeved on the upper end of the fixing rod, the upper pressing plate of the consolidation box is fixedly mounted on the lower end surface of the fixing plate by fasteners, and the stop pin is passed through the sixth through hole and the fifth through hole to fix the fixing plate and the fixing rod; S4. Connect the water inlet pipe to the cylinder, pass the water outlet pipe through the third through hole in the fixing plate and communicate with the first through hole in the upper sealing layer; S5. Start the hydraulic loading device, inject liquid into the annular rubber membrane in the consolidation box, collect the displacement of the annular rubber membrane in the diameter direction through the displacement sensor, and collect the liquid flow entering the annular rubber membrane and the liquid flow discharged from the annular rubber membrane through the liquid inlet flow sensor and the liquid outlet flow sensor respectively; The digital measuring device monitors and analyzes the data collected by the displacement sensor, the liquid inlet flow sensor and the liquid outlet flow sensor in real time, compares the consolidation compression volume of the sample with the flow volume of the liquid inlet and outlet in real time, and adjusts the liquid outlet control button and the liquid inlet control button in real time according to the comparison result to control the inlet and outlet flow of the liquid.

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