A monitoring model test device for the influence of an underground water-rich environment on a tunnel

Abstract

The application relates to the technical field of tunnel test, and particularly discloses a monitoring model test device for the influence of underground water-rich environment on a tunnel, which comprises an assembly box, a process box fixedly connected to one side of the assembly box, and an arc-shaped side of the assembly box provided with a through groove; a test plate is slidably connected to the arc-shaped side of the assembly box; a test opening is arranged on the test plate; a test assembly is arranged in the test opening; a simulated tunnel is arranged between the process box and the assembly box; prefabricated blocks are arranged in the process box; after the box cover is opened, geological simulation materials are filled in the assembly box and compacted to form simulated geological blocks; and a soil pressure sensor and a water seepage sensor are arranged in the assembly box before compaction. The test plate is slid on the bottom of the assembly box to change the test position of the test assembly, so that the test assembly can perform water injection test on the specified part.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel test, in particular to a monitoring model test device for the influence of underground water-rich environment on a tunnel. BACKGROUND

[0002] With the rapid development of China's transportation, water conservancy and other infrastructure construction, tunnel engineering is increasingly developing in the direction of deep and long, and inevitably passing through complex hydrogeological conditions, especially underground water-rich environment. High water pressure in water-rich stratum and seepage action are extremely easy to cause tunnel surrounding rock instability, lining cracking, gushing water and mud inrush and other major engineering disasters, which seriously threaten construction safety and operation life.

[0003] Therefore, accurately revealing the mechanical response and disaster mechanism of tunnel structure under water-rich environment is a key scientific problem to be solved in the field of tunnel engineering. Traditional numerical simulation and theoretical analysis need reliable physical test data as verification and support. The model test device can simulate high water pressure and large flow seepage conditions, and integrate a multi-dimensional and high-precision monitoring system to simulate and test the tunnel. Therefore, the model test device can provide an advanced experimental platform for related research, which is very necessary.

[0004] In the prior art, CN201621115140.4 a high water head water-rich tunnel test device, the device can simulate the working state of high water head water-rich tunnel structure system, and can test the water pressure bearing condition of tunnel lining under different conditions. However, the device cannot test the reinforcement effect of grouting reinforcement on the tunnel, nor can it test the influence of serious water inrush at a local point on the tunnel. SUMMARY

[0005] The purpose of the present application is to solve the problems existing in the prior art, and to provide a monitoring model test device for the influence of underground water-rich environment on a tunnel.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] The application discloses a monitoring model test device for the influence of an underground water-rich environment on a tunnel, which comprises an assembly box, a process box fixedly connected to one side of the assembly box, a box cover detachably connected between the process box and the one side of the assembly box, an arc-shaped surface at the bottom of the assembly box and provided with a through groove, a test plate slidably connected to the bottom of the assembly box, a test opening provided on the test plate, a test assembly arranged at the test opening, a water injection pipe arranged on the test assembly, a simulated tunnel arranged between the process box and the assembly box, prefabricated blocks arranged in the process box, and a simulated geological block formed by filling and compacting geological simulation materials in the assembly box after the box cover is opened, wherein a soil pressure sensor and a water seepage sensor are arranged in the assembly box before compaction, the water injection pipe is used for injecting water into the simulated geological block to simulate a water-rich environment, the test assembly is used for testing the simulated geological block in the water-rich environment, and the influence of the water-rich environment on the simulated tunnel is obtained, a plurality of process holes in different directions are arranged in the simulated tunnel, a grouting hole is drilled in the simulated geological block along the axial direction of the process hole at the process hole, and a grouting pipe is inserted into the grouting hole.

[0008] Further, the test assembly comprises two side plates, an installation plate rotatably connected to one side of the side plates, the installation plate being detachably connected to the simulated tunnel, an arc-shaped baffle arranged between the two side plates, the arc-shaped baffle being located at the test opening, and a water injection pipe arranged at the center of the arc-shaped baffle.

[0009] Further, the water injection pipe comprises a sleeve fixed to the center hole of the arc-shaped baffle and extending into the assembly box at one end, a plurality of water seepage holes are arranged on the pipe wall of the end of the sleeve extending into the assembly box, a core pipe is slidably connected into the sleeve, a blind plate is fixedly connected to one end of the core pipe, a group of water permeation holes are arranged on the pipe wall of the core pipe, and the water permeation holes can be overlapped with the water seepage holes in sequence along with the sliding of the core pipe in the sleeve.

[0010] Further, two hydraulic cylinders are hingedly arranged on the test plate, each of the hydraulic cylinders is provided with an extrusion block, each of the extrusion blocks is provided with a first inclined surface at one side, each of the two sides of the arc-shaped baffle is provided with a second inclined surface, and the two extrusion blocks are respectively located at the two sides of the arc-shaped baffle and the first inclined surfaces and the second inclined surfaces are one-to-one correspondingly arranged.

[0011] Further, a gap opening is arranged on the side plate, the telescopic shaft of the hydraulic cylinder passes through the gap opening, a compression ring is fixedly connected to the telescopic shaft of the hydraulic cylinder, and a plurality of crushing teeth are arranged on the side plate.

[0012] The monitoring model test device for the influence of an underground water-rich environment on a tunnel provided by the application can change the test position of the test assembly by sliding the test plate at the bottom of the assembly box, so that the test assembly can perform water injection test on the specified part, the injected water can only flow to the simulated geological block from the water seepage holes, the water-rich too much condition of the tunnel at the position can be simulated, and the soil pressure and seepage condition generated by the water-rich too much condition of the position on the surrounding can be monitored by the soil pressure sensor and the water seepage sensor. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a basic structure diagram of a monitoring model test device for the influence of an underground water-rich environment on a tunnel provided by the present application;

[0014] Figure 2 is a use state diagram in the present application;

[0015] Figure 3 is an installation layout diagram of the test assembly;

[0016] Figure 4 is Figure 3 an enlarged view of N of

[0017] Figure 5 is a front view of Figure 3

[0018] Figure 6 is a structure diagram of the water injection pipe. DETAILED DESCRIPTION

[0019] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0020] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0021] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.​

[0022] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0023] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] like Figures 1-6 As shown, this embodiment of the monitoring model test device for the impact of underground water-rich environment on tunnels includes an assembly box 1 with an arc-shaped bottom. A process box 11 is fixedly connected to one side of the assembly box 1, and the process box 11 is connected to the assembly box 1. Multiple first support columns 13 are fixedly connected to the bottom of the assembly box 1, and second support columns 14 are fixed to one side of both the assembly box 1 and the process box 11. Both the process box 11 and one side of the assembly box 1 are open, and a box cover is detachably connected to the open end. The method of detachable connection of the box cover is prior art and will not be described in detail here. The assembly box 1 has a through groove at its arc-shaped bottom. The test plate 2 is slidably connected to the bottom of the assembly box 1. The arc of the test plate 2 matches the arc of the bottom arc surface of the assembly box 1. The sliding connection of the test plate 2 is existing technology and will not be described in detail here. The test plate 2 has a test port, and a test component 3 is installed at the test port. By sliding the test plate 2 at the bottom of the assembly box 1, the test position of the test component 3 can be changed. This allows the monitoring model test device of this embodiment to perform water injection tests on different parts.

[0026] The process box 11 and the assembly box 1 are provided with a simulated tunnel 100, and the process box 11 is internally provided with a precast block 900. The precast block 900 is arranged on one side of the simulated tunnel 100. In use, the monitoring model test device of the embodiment is first supported and fixed by the second support column 14, at this time, the box cover is arranged upward, after the box cover is opened, the geological simulation material is filled in the assembly box 1 and is compacted to form a simulated geological block 200, and before the compaction, the earth pressure sensor and the water seepage sensor are embedded in the assembly box 1. The earth pressure sensor and the water seepage sensor are prior art, and will not be described here. The filling and compaction of the geological simulation material also belong to the prior art, and will not be described here.

[0027] The test assembly 3 includes two side plates 31, one side of the side plate 31 is rotatably connected with a mounting plate 32, the mounting plate 32 is detachably connected with the simulated tunnel 100, and specifically, mounting holes are reserved around the outer wall of the simulated tunnel 100, when the side plate 31 and the mounting plate 32 are rotated to the specified position and are aligned with the mounting holes, the mounting plate 32 is temporarily fixed at the mounting holes at this position by the pin 321. An arc-shaped baffle 33 is arranged between the two side plates 31, and the arc-shaped baffle 33 is located at the test opening. Two hydraulic cylinders 34 are hingedly arranged on the test plate 2, and each hydraulic cylinder 34 is provided with an extrusion block 35. The two extrusion blocks 35 are respectively located on the two sides of the arc-shaped baffle 33, and the position of the arc-shaped baffle 33 can be temporarily fixed by the two extrusion blocks 35. A first inclined surface is arranged on one side of each extrusion block 35, and a second inclined surface is arranged on the two sides of the arc-shaped baffle 33, and the first inclined surface and the second inclined surface are arranged in one-to-one correspondence.

[0028] The center of the arc-shaped baffle 33 is provided with a water injection pipe 5. The water injection pipe 5 includes a sleeve 51, the sleeve 51 is fixed in the center hole of the arc-shaped baffle 33 and one end of the sleeve 51 extends into the assembly box 1, a plurality of water seepage holes 50 are arranged on the pipe wall of the one end of the sleeve 51 extending into the assembly box 1, a core pipe 52 is slidably connected in the sleeve 51, one end of the core pipe 52 is fixedly connected with a blind plate 54, a group of water permeable holes 53 are arranged on the pipe wall of the core pipe 52, and as the core pipe 52 slides in the sleeve 51, the water permeable holes 53 can be overlapped with the water seepage holes 50 in sequence.

[0029] The use method of the monitoring model test device for the influence of the underground water-rich environment on the tunnel disclosed in the embodiment is as follows:

[0030] Step one, the test position of the test assembly 3 is changed by sliding the test plate 2 at the bottom of the assembly box 1, so that the test assembly 3 performs the water injection test on the specified part.

[0031] Step two, the whole device is supported and fixed by the second support column 14, at this time, the box cover is arranged upward, after the box cover is opened, the geological simulation material is filled in the assembly box 1, and at the same time, the earth pressure sensor and the water seepage sensor are embedded in the assembly box 1, and the embedding positions of the earth pressure sensor and the water seepage sensor are determined according to the water injection position.

[0032] Step three, compacting the geological simulation material to form the simulation geological block 200, and changing the support and fixation of the whole device by the first support column 13.

[0033] Step four, sliding the core pipe 52 in the sleeve pipe 51 to make the water permeable hole 53 coincide with the corresponding water permeable hole 50, and injecting water into the core pipe 52, the injected water can only flow from the water permeable hole 50 to the simulation geological block 200, so as to simulate the case that the tunnel is rich in water at this position, and the earth pressure and seepage condition generated by the rich water at this position are monitored by the earth pressure sensor and the water seepage sensor, and the value change of the earth pressure sensor and the water seepage sensor is recorded. If a large area is rich in water, the core pipe 52 is taken out, and water is directly injected into the sleeve pipe 51, so that the simulation geological block 200 will exist in a large area of water seepage.

[0034] Step five, the extrusion block 35 is pushed forward by the hydraulic cylinder 34, and the arc-shaped baffle 33 generates extrusion force on the simulation geological block 200 under the action of the first inclined surface and the second inclined surface, the earth pressure sensor and the water seepage sensor are monitored and the value change is recorded at the same time, and when the pressure ring 36 contacts the edge plate 31, the edge plate 31 can also generate slight extrusion force and destructive force on the simulation geological block 200, so as to further realize the influence of local rich water on the tunnel under various working conditions.

[0035] Step six, recording the values, crushing or taking out the simulation geological block 200, and repeating steps one to five, so that the earth pressure and seepage condition generated by the rich water at different positions under the tunnel can be tested.

[0036] As a preferred embodiment of the present application, in order to facilitate crushing the simulation geological block 200 after the test is completed, the edge plate 31 is provided with a let-out opening, the telescopic shaft of the hydraulic cylinder 34 passes through the let-out opening, the pressure ring 36 is fixedly connected on the telescopic shaft of the hydraulic cylinder 34, and a plurality of crushing teeth 37 are arranged on the edge plate 31. After the test is completed, the arc-shaped baffle 33 is first removed, the hydraulic cylinder 34 is telescoped and extrudes the edge plate 31 through the pressure ring 36, so that the edge plate 31 rotates, the crushing teeth 37 on one side of the edge plate 31 are inserted into the simulation geological block 200, and then the simulation geological block 200 is crushed, so as to facilitate taking out the simulation geological block 200.

[0037] As a preferred embodiment of the present application, the embodiment can also test the effect of grouting reinforcement when water is rich in the tunnel. Specifically, a plurality of process holes in different directions are provided in the simulation tunnel 100. After step five is completed, a grouting hole is drilled in the simulation geological block 200 along the axis direction of the process hole at the process hole. A grouting pipe 300 is inserted into the grouting hole and grouting reinforcement is performed. After the grouting is solidified and curing is completed, the soil pressure and seepage conditions generated by excessive water at the location are monitored by the soil pressure sensor and the water seepage sensor, and the value changes of the soil pressure sensor and the water seepage sensor are recorded, so as to determine the treatment effect of grouting reinforcement on the excessive water disease at the location of the tunnel. Because the grouting pipe 300 is provided, the grouting pipe 300 needs to be removed before a new round of test is performed. At this time, a lot of sludge or debris is attached to the outer surface of the grouting pipe 300. If the grouting pipe 300 is removed from the simulation tunnel 100, the sludge or debris is easy to damage the process hole. Therefore, the grouting pipe 300 can only be removed from the outside of the simulation tunnel 100.

[0038] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. The circuit, electronic components and modules involved are prior art, and those skilled in the art can completely realize them without further description. The content protected by the present application does not involve improvement of software and method.

Claims

1. A monitoring model test device for the impact of underground water-rich environment on tunnels, characterized in that: The assembly includes an assembly box, a process box fixedly connected to one side of the assembly box, and a cover detachably connected to the process box and the assembly box. The bottom of the assembly box is arc-shaped with a through groove. A test plate is slidably connected to the bottom of the assembly box, and a test port is provided on the test plate. A test component is installed at the test port, and a water injection pipe is installed on the test component. A simulated tunnel is provided between the process box and the assembly box. The process box contains prefabricated blocks. After the cover is opened, geological simulation material is filled into the assembly box and compacted to form a simulated geological block. Before compaction, soil pressure sensors and water seepage sensors are embedded in the assembly box. Water is injected into the simulated geological block through the water injection pipe to simulate a water-rich environment. The simulated geological block in the water-rich environment is tested through the test component to determine the impact of the water-rich environment on the simulated tunnel. The simulated tunnel has multiple process holes in different directions. Grouting holes are drilled from the process holes into the simulated geological block. The grouting holes are coaxially arranged with the process holes, and grouting pipes are inserted into the grouting holes. The test assembly includes two side plates, one side of which is rotatably connected to a mounting plate. The mounting plate is detachably connected to the simulated tunnel. An arc-shaped baffle is provided between the two side plates. The arc-shaped baffle is located at the test opening, and a water injection pipe is provided at the center of the arc-shaped baffle. The water injection pipe includes a sleeve, which is fixed to the center hole of the arc-shaped baffle and extends into the assembly box at one end. The sleeve has multiple sets of seepage holes on the wall of the end of the sleeve that extends into the assembly box. A core tube is slidably connected inside the sleeve, and a blind plate is fixedly connected to one end of the core tube. A set of permeable holes is provided on the wall of the core tube. As the core tube slides inside the sleeve, the permeable holes can sequentially coincide with the seepage holes.

2. The monitoring model test device for the impact of underground water-rich environment on tunnels according to claim 1, characterized in that: Two hydraulic cylinders are hinged to the test plate. Each hydraulic cylinder is equipped with a pressing block. Each pressing block has a first inclined surface on one side. The arc-shaped baffle has a second inclined surface on both sides. The two pressing blocks are located on both sides of the arc-shaped baffle, and the first and second inclined surfaces are arranged in a one-to-one correspondence.

3. The monitoring model test device for the impact of underground water-rich environment on tunnels according to claim 2, characterized in that: The side plate is provided with a clearance opening, the telescopic shaft of the hydraulic cylinder passes through the clearance opening, and a pressure ring is fixedly connected to the telescopic shaft of the hydraulic cylinder. The side plate is provided with multiple crushing teeth.

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