Water-rich high ground stress strike-slip fault simulation test box and method

Abstract

The invention relates to a water-rich high ground stress strike-slip fault simulation test box body and method, the water-rich high ground stress strike-slip fault simulation test box body comprises a first box body and a second box body, a flexible box body is fixedly connected between the first box body and the second box body, and the flexible box body comprises a plurality of fault area flexible connection units; each section of fault area flexible connecting unit comprises a framework flange, a rubber ring and a steel plate embedded in the rubber ring; framework flanges are fixed to the two axial sides of the rubber ring, and every two adjacent fault area flexible connecting units are connected through a bolt device fixed to every two adjacent framework flanges. The flexible box body is composed of the multiple sections of fault area flexible connecting units, the framework flange is used for connecting the multiple sections, the rubber ring has the capacity of providing axial tensile deformation and transverse shear deformation and provides a sealing function under the pressure condition, the embedded steel plate is used for restraining expansion deformation of the rubber ring under the pressure effect, and therefore the flexible box body can be used for connecting the multiple sections of fault area flexible connecting units. Therefore, the flexible box body can intuitively reflect the condition of the fault fracture zone under the action of high ground stress.

Description

Technical Field

[0001] The invention relates to the research and development field of a strike-slip fault simulation test box device in a broken zone and the field of a water-rich high-ground stress simulation test, in particular to a water-rich high-ground stress strike-slip fault simulation test box and method. Background Art

[0002] High geostress areas have complex geological conditions and strong fault activity, which puts forward extremely high technical requirements for the design, manufacture and installation of devices used in high geostress areas. For example, most of the simulation test devices for high geostress nowadays use square boxes to facilitate the horizontal and vertical pressurization of the test soil and rock, but the high geostress situation is complex in reality, and it is difficult to simulate the real situation more comprehensively and multi-facetedly by simply pressurizing from the horizontal and vertical directions. In addition, the environmental conditions that most high geostress test devices can adapt to nowadays are relatively single, and they cannot simulate pressurization in more complex environments. For example, in the simulation test of submarine tunnel excavation, the soil is in a water-rich environment, which is a key test simulation condition, and the existing test devices cannot simulate a water-rich environment. Therefore, the development of test devices that can perform pressurization in more directions and can realize test research under more complex environments and conditions is an urgent problem to be solved in this field. Summary of the invention

[0003] The purpose of the present application is to provide a water-rich high-stress strike-slip fault simulation test box and method, aiming to solve the problems existing in the prior art.

[0004] The embodiment of the present application provides a water-rich high-in-situ stress strike-slip fault simulation test box, comprising a first box and a second box, wherein a flexible box is fixedly connected between the first box and the second box, and the flexible box is internally connected to the first box and the second box; the flexible box comprises a plurality of fault zone flexible connection units, each of which comprises a skeleton flange, a rubber ring, and a steel plate embedded in the rubber ring; skeleton flanges are fixed on both axial sides of the rubber ring, and two adjacent fault zone flexible connection units are connected by bolt devices fixed on two adjacent skeleton flanges;

[0005] A base is provided under each of the first box body, the second box body and the flexible box body. A roller assembly is installed under every two adjacent skeleton flanges in the flexible box body. The roller assembly includes at least one roller. A slide rail is installed on the base corresponding to the roller assembly. The slide rail corresponds to the roller assembly one by one, and the roller in the roller assembly is cooperatively connected with the slide rail.

[0006] Furthermore, the first box body and the second box body have the same structure, both of which are cylindrical in shape with one end hemispherically closed and the other end cut off, and the open end is fixedly connected to a flange connected to the flexible box body; the closed ends of the first box body and the second box body are both provided with an air inlet and a water inlet connected to the interior; an external air pump inflates and pressurizes the box body through the air inlet, and an external water source injects water into the box body through the water inlet.

[0007] Furthermore, the first box body and the second box body are both installed on the base platform below them through a bracket assembly; the bracket assembly includes support frames respectively installed at the closed end and the open end of the box body and a base frame connecting the two support frames.

[0008] Furthermore, the roller assembly also includes a side frame, the upper portion of which is in an arc shape that matches the curvature of the frame flange, and is fixedly connected to the frame flange in the arc region by a bolt device; a plurality of rollers are colinearly installed at the lower portion of the side frame.

[0009] Furthermore, the cross section of the slide rail is I-shaped, the wheel surface of the roller is provided with a groove, and the upper end of the slide rail is embedded in the groove of the roller so that the roller moves linearly in the horizontal direction along the slide rail.

[0010] Further, the steel plate extends vertically in the rubber ring.

[0011] A method for using a water-rich high-ground stress strike-slip fault simulation test box, wherein the opening end of a first box is erected upward by a hoisting beam, a test soil body is filled into the opening of the first box, and a flexible box and a second box are sequentially installed after the filling is completed; after the filling is completed, the test box is placed in a fully closed state as a whole and the test box is placed horizontally on a vibration table for testing; wherein the first box and a bottom platform under the flexible box are fixed, and the bottom platform under the second box is installed on the vibration table; at this time, air can be inflated into the box through an air inlet to pressurize the test soil body, and water can be injected into the box through a water inlet to achieve a water-rich environment;

[0012] During the test, the vibration table moves the bottom platform under the second box in the horizontal direction, thereby changing the relative positions of the first box and the second box. Since the flexible box is connected between the first box and the second box, the displacement of the first box and the second box will cause the flexible box to deform and move, and the relative positions of the flexible connection units in the fault zones of each section of the flexible box will change, driving the roller assembly provided under the flexible box to slide on the slide rail to varying degrees, causing the fault fracture zone area of ​​the test soil inside the flexible box to deform and rupture, thereby realizing the simulation test study of high ground stress strike-slip faults in a water-rich environment.

[0013] Both the high ground stress test device and the fault simulation test device are important test devices in the field of civil engineering. The two test devices do not contradict or conflict with each other. By coordinating the two test devices, fault simulation tests of the test soil under high ground stress can be realized, and test research under more complex conditions can be completed.

[0014] The beneficial effects of the present invention are:

[0015] The test box of the present invention is in a fully enclosed state as a whole, and water can be injected before the test begins to create a water-rich environment, so that experimental research under water-rich environmental conditions can be better realized.

[0016] The first box, the second box and the flexible box of the present invention all adopt a cylindrical box shape and the box end adopts a hemispherical structure, so that the test soil can adapt to higher intensity pressurization under this box structure, increasing the tolerable range of the test box, thereby completing more difficult test research.

[0017] The flexible box of the present invention is composed of multiple sections of flexible connection units in the fault zone, wherein the skeleton flange is used for connection between the multiple sections, the rubber ring has the ability to provide axial tensile deformation and lateral shear deformation, and provides a sealing function under pressure, and the embedded steel plate is used to constrain the expansion deformation of the rubber ring under pressure. Therefore, the flexible box can intuitively reflect the situation in the fault fracture zone under high ground stress.

[0018] The roller assembly provided under the flexible box of the present invention provides an upward supporting force for the flexible box to solve the problem of the flexible box falling due to the deadweight of the test soil, and the roller assembly cooperates with the slide rail so that the flexible box can move horizontally when a dislocation occurs. The roller assembly can well cooperate with the dislocation of the vibration table to cause the fault flexible connection unit of the flexible box to deform and move, and the activity distance of each roller assembly also reflects the situation in the fault fracture zone area.

[0019] Therefore, the present invention can realize the experimental research of high ground stress and active faults in more complex situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the structure of the present invention from a top view.

[0022] Figure 3 It is a schematic diagram of the structure of the first box and the second box.

[0023] Figure 4 It is a schematic diagram of the overall structure of the flexible box.

[0024] Figure 5 It is a schematic diagram of the partial cross-section structure of the flexible box.

[0025] Figure 6 Schematic diagram of the overall structure of the bracket assembly.

[0026] Figure 7 It is a schematic diagram of the overall structure of the roller assembly.

[0027] Figure 8 It is a schematic diagram of the assembly state of the roller assembly on the flexible box.

[0028] Fig. 9 It is a schematic diagram of the assembly status of the roller assembly and the slide rail.

[0029] Fig.10 It is a schematic diagram of the overall structure of the present invention under testing status.

[0030] Fig.11 It is a schematic diagram of the local structure of the flexible box under test.

[0031] In the figure:

[0032] 1. First box body; 11. Air inlet; 12. Water inlet; 2. Second box body; 3. Flexible box body; 31. Rubber ring; 32. Steel plate; 33. Frame flange; 4. Bracket assembly; 41. Support frame; 42. Base frame; 43. Circular hole; 44. Reinforcement rib plate; 5. Roller assembly; 51. Roller; 511. Wheel body; 512. Retaining ring; 52. Side frame; 53. Wheel axle; 6. Slide rail; 7. Base; 8. Bolt device. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] like Figure 1 , Figure 2 and Figure 3As shown, the present invention provides a water-rich high-in-situ stress strike-slip fault simulation test box, which is used for conducting a high-in-situ stress strike-slip fault simulation test. The present invention can use an earthquake simulation vibration table test device to conduct a fault simulation test on the test soil. The present invention includes a first box 1, a second box 2, a flexible box 3, a bracket assembly 4, a roller assembly 5, a slide rail 6, a base 7 and a bolt device 8. The first box 1 and the second box 2 are respectively fixed on the base 7 below them through the bracket assembly 4, the opening ends of the first box 1 and the second box 2 are opposite and set at a certain distance, the two ends of the flexible box 3 are open, the flexible box 3 is fixed to the horizontal opening in the middle of the first box 1 and the second box 2 through the bolt device 8 and is connected with the first box 1 and the second box 2 to form a test soil filling area, and the fault fracture zone area of ​​the test soil is set inside the flexible box 3. The roller assembly 5 is installed below the flexible box 3, and the roller assembly 5 cooperates with the slide rail 6 on the base 7 below it to move, so that it meets the test requirements of simulating active faults with rich water and high in-situ stress.

[0035] like Figure 3 As shown, the first box body 1 and the second box body 2 are both hemispherically closed at one end and cut off at the other end, and a flange is installed at the opening. The first box body 1 and the second box body 2 are of the same size, both are cylindrical boxes, and are placed horizontally at the same height. The hemispherical closed ends of the first box body and the second box body are fixed with an air inlet 11 and a water inlet 12 by a bolt device 8. The air pump pressurizes the inside of the box body through the air inlet 11, and water can be injected into the box body through the water inlet 12 to create a water-rich environment.

[0036] like Figure 4 and Figure 5 As shown, the flexible box 3 adopts a cylindrical box, and the flexible box 3 includes a rubber ring 31, a steel plate 32 embedded in the rubber ring, and a skeleton flange 33. Both sides of the rubber ring 31 are fixedly connected to the skeleton flange 33, and there are several embedded steel plates 32 in the rubber ring 31. The rubber ring 31 and the skeleton flanges 33 on both sides and the steel plate 32 inside the rubber ring 31 form a section of the fault zone flexible connection unit. The skeleton flanges 33 are connected between multiple sections of the fault zone flexible connection units through bolt devices 8 to form the flexible box 3. The skeleton flange 33 is used for connecting multiple sections of the fault zone flexible connection units. The rubber ring 31 has the ability to provide axial tensile deformation and lateral shear deformation, and provides a sealing function under pressure. The steel plate 32 is used to constrain the expansion and deformation of the rubber ring 31 under pressure. The flexible box 3 can intuitively reflect the situation of the fault fracture zone under high ground stress.

[0037] like Figure 6As shown, the support assembly 4 includes a support frame 41 and a base frame 42. The cross section of the support frame 41 is a triangle with an arc vertex, and a circular hole 43 is provided in the arc region of the support frame 41. The size of the circular hole 43 is slightly larger than the cross-sectional size of the first box body 1 and the second box body 2. The first box body 1 and the second box body 2 are fixed to the support frame 41 through the circular hole, and two support frames 41 are installed at intervals on both boxes. The two support frames 41 on the same box are respectively located at the closed end and the open end area of ​​the box body. The base frame 42 is located below the support frame 41, and two support frames 41 and one base frame 42 form a support assembly 4. A reinforcing rib plate 44 is provided on the base frame 42 between the two support frames 41. The support assembly 4 is fixed on the base platform 7.

[0038] like Figure 7 and Figure 8 The roller assembly 5 includes a roller 51, a side frame 52 and a wheel axle 53. The roller 51 includes a wheel body 511 and a retaining ring 512. The retaining ring 512 is installed at both ends of the circumferential surface of the wheel body 511 so that a groove is formed in the middle of the wheel surface. The center of the roller 51 is provided with an axial hole. The cross-sectional shape of the side frame 52 is formed by a combination of an arc shape and a trapezoid. The lower left corner and the lower right corner of the cross-sectional area of ​​the side frame 52 are provided with axial holes. The axial holes on the side frame 52 are consistent in size with the axial holes of the roller 51 and their positions remain coincident. The wheel axle 53 is penetrated in the two axial holes so that the roller is installed on the side frame. Two rollers 51, one side frame 52 and two wheel axles 53 constitute a roller assembly 5. The arc-shaped area on the upper cross-sectional area of ​​the side frame 52 is connected to the two sides of the frame flange 33 of the third box body through a bolt device 8. The two rollers 51 are colinearly installed on the front and rear sides below the frame flange 33 and are located in the trapezoidal area below the cross-sectional area of ​​the side frame 52.

[0039] like Fig. 9 As shown, the slide rail 6 adopts an I-beam slide rail, the wheel body 511 of the roller 51 is in contact with the slide rail 6, and the retaining ring 512 of the roller 51 is located on both sides outside the slide rail 6. The slide rail 6 is fixed on the base 7 and is consistent with the number of roller assemblies 51. The roller assembly 5 can move linearly in the horizontal direction on the slide rail 6.

[0040] like Fig.10 and Fig.11As shown, when filling the test soil, the first box is set in a vertical state through the lifting beam, and the test soil is filled in from the opening of the first box. After the filling is completed, the flexible box and the second box are installed in sequence in a vertical state. After the overall filling is completed, the test box is in a fully closed state as a whole and the test box is placed horizontally on a vibration table for testing. The first box and the base under the flexible box are fixed, and the base under the second box is installed on the vibration table. An air pressure pump can be used to connect the air inlet 11 to inflate the inside of the box to pressurize the test soil, and water can also be injected into the box through the water inlet 12 to create a water-rich environment.

[0041] During the test, the base 7 under the second box 2 is moved horizontally by the vibration table, and the base of the first box 1 is stationary, thereby the relative positions of the first box and the second box are changed. Since the flexible box 3 is connected between the first box 1 and the second box 2, the displacement of the first box 1 and the second box 2 will cause the flexible box 3 to deform and move, and the relative positions of the flexible connection units in the fault zones of each section of the flexible box are changed, driving the roller assembly 5 arranged under the flexible box 3 to slide on the slide rail 6 to varying degrees, causing the fault fracture zone area of ​​the test soil inside the flexible box to deform and rupture, thereby realizing the simulation test study of high ground stress strike-slip faults in a water-rich environment.

[0042] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered as exemplary and non-restrictive in all respects.

Claims

1. A water-rich high-stress strike-slip fault simulation test box, characterized in that: It comprises a first box body and a second box body, a flexible box body is fixedly connected between the first box body and the second box body, and the flexible box body is internally connected with the first box body and the second box body; the flexible box body comprises a plurality of fault zone flexible connection units, each of which comprises a skeleton flange, a rubber ring and a steel plate embedded in the rubber ring; skeleton flanges are fixed on both axial sides of the rubber ring, and two adjacent fault zone flexible connection units are connected by bolt devices fixed on two adjacent skeleton flanges; A base is provided under each of the first box body, the second box body and the flexible box body. A roller assembly is installed under every two adjacent skeleton flanges in the flexible box body. The roller assembly includes at least one roller. A slide rail is installed on the base corresponding to the roller assembly. The slide rail corresponds to the roller assembly one by one, and the roller in the roller assembly is cooperatively connected with the slide rail.

2. The water-rich high-in-situ stress strike-slip fault simulation test box according to claim 1 is characterized in that: The first box body and the second box body have the same structure, both of which are cylindrical with one end hemispherically closed and the other end cut off, and the open end is fixedly connected to a flange connected to the flexible box body; the closed ends of the first box body and the second box body are both provided with an air inlet and a water inlet connected to the interior; an external air pump inflates and pressurizes the box body through the air inlet, and an external water source injects water into the box body through the water inlet.

3. The water-rich high-in-situ stress strike-slip fault simulation test box according to claim 2 is characterized in that: The first box and the second box are both installed on the bottom platform below them through a bracket assembly; the bracket assembly includes support frames respectively installed at the closed end and the open end of the box and a bottom frame connecting the two support frames.

4. The water-rich high-in-situ stress strike-slip fault simulation test box according to claim 2 is characterized in that: The roller assembly also includes a side frame, the upper part of which is in an arc shape matching the arc of the frame flange, and is fixedly connected to the frame flange in the arc area by a bolt device; a plurality of rollers are colinearly installed at the lower part of the side frame.

5. The water-rich high-in-situ stress strike-slip fault simulation test box according to claim 4 is characterized in that: The cross section of the slide rail is I-shaped, the wheel surface of the roller is provided with a groove, the upper end of the slide rail is embedded in the groove of the roller so that the roller moves linearly in the horizontal direction along the slide rail.

6. The water-rich high-in-situ stress strike-slip fault simulation test box according to claim 1, characterized in that: The steel plate extends vertically in the rubber ring.

7. A method for using the water-rich high-in-situ stress strike-slip fault simulation test box according to any one of claims 1 to 6, characterized in that: The opening end of the first box is erected upward by means of a hoisting beam, and the test soil is filled into the opening of the first box. After the filling is completed, the flexible box and the second box are installed in sequence; after the filling is completed, the test box is fully enclosed as a whole and the test box is placed horizontally on a vibration table for testing; the first box and the bottom platform under the flexible box are fixed, and the bottom platform under the second box is installed on the vibration table; at this time, air can be inflated into the box through the air inlet to pressurize the test soil, and water can be injected into the box through the water inlet to achieve a water-rich environment; During the test, the vibration table moves the bottom platform under the second box in the horizontal direction, thereby changing the relative positions of the first box and the second box. Since the flexible box is connected between the first box and the second box, the displacement of the first box and the second box will cause the flexible box to deform and move, and the relative positions of the flexible connection units in the fault zones of each section of the flexible box will change, driving the roller assembly provided under the flexible box to slide on the slide rail to varying degrees, causing the fault fracture zone area of ​​the test soil inside the flexible box to deform and rupture, thereby realizing the simulation test study of high ground stress strike-slip faults in a water-rich environment.

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