A new roadway grouting reinforcement similar model test device and method

Abstract

The application discloses a novel roadway grouting reinforcement similar model test device and method, relates to the technical field of test devices, and solves the problems of poor simulation effect and poor adaptability of the existing grouting test device, improves the simulation effect and adaptability, and specifically has the following arrangement: the device comprises a loading system, a test bin and a grouting system, the test bin is composed of a roadway module and a surrounding rock module, the roadway module is horizontally inserted into the middle position of the surrounding rock module, the surrounding rock module contains surrounding rock similar material, the loading system is used for loading the surrounding rock similar material in the surrounding rock module to simulate different geological stress scenes, a plurality of grouting holes are formed in the roadway module, the grouting system is connected with the grouting holes through grouting pipes, the size of the grouting holes is slightly larger than that of the grouting pipes, and the grouting holes and the grouting pipes are sealed and fixed through sealing rings.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of test devices, in particular to a novel roadway grouting reinforcement similar model test device and method. BACKGROUND

[0002] With the development of tunnel engineering construction to be deeper, longer and faster, grouting technology has gradually become one of the indispensable core construction links of high-risk poor geological tunnels. The grouting effect and slurry diffusion law are often difficult to see directly in engineering practice or theoretical analysis, and numerical simulation often needs to make certain construction and simplification on engineering geological conditions, slurry diffusion mode, etc., while model test can consider as many actual situations as possible and can carry out a large number of tests.

[0003] The inventor finds that the existing grouting test device can simulate grouting under different stress conditions, but the grouting position is fixed, cannot simulate grouting at different positions and angles according to requirements, and the operation is complex; and the existing grouting test device is mostly used for simulation of rock mass grouting or simulation of splitting grouting, and cannot be used for grouting reinforcement simulation of roadway. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to provide a novel roadway grouting reinforcement similar model test device and method, which sets a roadway module and a surrounding rock module, effectively simulates the actual roadway and surrounding rock, simultaneously loads the surrounding rock module by using a loading system, can simulate different surrounding rock stresses, the size of the grouting hole is larger than that of the grouting pipe, and the grouting angle can be adjusted according to actual requirements, greatly improving the simulation range of the device and the degree of fit with the actual working condition, and solving the problems of poor simulation effect and poor adaptability of the existing grouting test device.

[0005] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme:

[0006] In the first aspect, the present application provides a novel roadway grouting reinforcement similar model test device, which comprises a loading system, a test bin and a grouting system, the test bin is composed of a roadway module and a surrounding rock module, the roadway module is horizontally inserted into the middle position of the surrounding rock module, the surrounding rock module contains surrounding rock similar material, the loading system is used for loading the surrounding rock similar material in the surrounding rock module to simulate different geological stress scenarios; a plurality of grouting holes are formed in the roadway module, the grouting system is connected with the grouting holes through a grouting pipe, the size of the grouting hole is slightly larger than that of the grouting pipe, and the grouting hole and the grouting pipe are sealed and fixed through a sealing ring.

[0007] As a further implementation manner, the loading system is composed of a counter-force frame and a plurality of hydraulic cylinders, the surrounding rock module is placed on the counter-force frame, and the hydraulic cylinders are fixedly arranged on the counter-force frame to press the surrounding rock similar material in the surrounding rock module.

[0008] As a further implementation manner, the surrounding rock module is composed of a side wall, a bottom plate, a front cover plate and a rear cover plate, angle steels are welded on the bottom plate, the front cover plate, the rear cover plate and the side wall are inserted into the region surrounded by the angle steels, the side wall is slidably connected with the front cover plate and the rear cover plate, and holes for mounting the roadway module are formed in the front cover plate and the rear cover plate.

[0009] As a further implementation manner, the roadway module is composed of a roadway model and a plurality of anchor rods arranged on the roadway model, the anchor rods are inserted into the roadway model and fixed by nuts, and a roadway gasket is sleeved on the anchor rod and located outside the roadway model.

[0010] As a further implementation manner, the roadway model is composed of a roadway side plate, a roadway top plate and a roadway bottom plate, one roadway fixator is arranged at each opening end of the roadway model, and the roadway side plate, the roadway top plate and the roadway bottom plate are inserted between the two oppositely arranged roadway fixators.

[0011] As a further implementation manner, the roadway fixators are connected by a reinforcing column at diagonal positions, and the inner side of the roadway fixator has a protrusion with a set thickness to support part of the inner wall of the roadway model.

[0012] As a further implementation manner, the bottom of the roadway top plate is supported by the roadway side plate.

[0013] As a further implementation manner, the grouting system is composed of a grouting pipe, a grouting barrel and an air compressor, and the grouting pipe and the grouting barrel and the grouting barrel and the air compressor are connected by a grouting hose.

[0014] As a further implementation manner, a plurality of holes are uniformly formed on the pipe body of the grouting pipe along the circumferential direction and the axial direction.

[0015] In the second aspect, the application provides a novel roadway grouting reinforcement similar model test method, which is specifically as follows:

[0016] The surrounding rock similar material is added to the bottom of the hole of the surrounding rock module, the roadway model is assembled at the hole of the surrounding rock module, one end of the anchor rod is inserted into the roadway model and is initially fixed, and the anchor rod gasket is added to the anchor rod;

[0017] The grouting pipe is pre-buried at the position designed in advance and the angle thereof is adjusted, the grouting hole is blocked by the sealing ring, and the surrounding rock similar material is added to the top end of the surrounding rock module;

[0018] The hydraulic cylinder is controlled to apply a set initial load to simulate the stress of the surrounding rock of the roadway, and grouting is performed through the grouting pipe;

[0019] After a predetermined grouting effect is reached, the grouting is stopped, the roadway model is removed after the grout is finally cured, and the anchor rod is fixed again, and the grouting model sample is maintained;

[0020] After the maintenance of the grouting model sample is completed, the formwork is removed, drilling and coring are performed, the grouting reinforcement bodies at different positions are cut, sampled and numbered, and the mechanical properties of the grouting reinforcement body sample are measured.

[0021] The beneficial effects of the present application are as follows:

[0022] (1) The present application sets up a roadway module and a surrounding rock module, effectively simulates the actual roadway and surrounding rock, and loads the surrounding rock module by using a loading system, so that different surrounding rock stresses can be simulated, the size of the grouting hole is larger than that of the grouting pipe, the grouting angle can be adjusted according to actual needs, the simulation range of the device and the degree of fit with the actual working condition are greatly improved, and the sealing and fixing between the grouting pipe and the grouting hole are realized by using a rubber ring, which is simpler and lower in cost than using a joint structure with variable angle.

[0023] (2) The roadway module of the present application is assembled in a plug-in manner, which is more convenient to disassemble, and the inner side of the roadway fixer has a protrusion with a set thickness, which can support part of the inner wall of the roadway model; the bottom of the roadway roof is supported by the roadway side plate, which greatly improves the anti-deformation ability of the roadway model.

[0024] (3) The roadway gasket of the present application is located outside the roadway model, and after the roadway model is removed, the roadway gasket does not need to be installed again, the anchor rod can be directly fixed with the surrounding rock through a nut, the difficulty of fixing connection between the anchor rod and the surrounding rock is reduced, the installation and fixation of the anchor rod are facilitated, and the operation difficulty is greatly reduced.

[0025] (4) The present application removes the roadway model after grouting, avoids the influence of the roadway model on the surrounding rock model, can more truly restore and facilitate observation of the deformation of the grouting model sample at the boundary of the roadway. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application and the explanation thereof serve to explain the present application, and do not constitute an improper limitation of the present application.

[0027] Figure 1 is a schematic diagram of the overall structure of a novel roadway grouting reinforcement similar model test device according to one or more embodiments of the present application;

[0028] Figure 2is a structural schematic diagram of a roadway module according to one or more embodiments of the present application;

[0029] Figure 3 is a structural schematic diagram of a grouting pipe according to one or more embodiments of the present application;

[0030] In the figure: the mutual distance or size is exaggerated for showing the position of each part, and the schematic diagram is only for illustration;

[0031] Wherein, 1, vertical beam; 2, cross beam; 3, bearing plate; 4, hydraulic cylinder; 5, side wall; 6, upper cover plate; 7, bottom plate; 8, front cover plate; 9, rear cover plate; 10, anchor rod; 11, roadway fixer; 12, grouting hole; 13, roadway side plate; 14, grouting pipe; 15, grouting hose; 16, grouting barrel; 17, air compressor; 18, angle steel; 19, sealing ring; 20, bolt; 21, roadway roof; 22, roadway floor; 23, roadway gasket. DETAILED DESCRIPTION

[0032] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0033] As introduced in the background, the existing grouting test device can simulate grouting under different stress conditions, but the grouting position is fixed, and different position and angle grouting simulation cannot be performed according to requirements, and the operation is complex; and the existing grouting test device is mostly used for simulating rock mass grouting or splitting grouting, and cannot be used for grouting reinforcement simulation of the roadway. In order to solve the above technical problems, the present application proposes a new type of roadway grouting reinforcement similar model test device and method.

[0034] Example 1

[0035] In a typical embodiment of the present application, as shown in Figures 1-3 A new type of roadway grouting reinforcement similar model test device is proposed, which comprises a loading system, a test bin and a grouting system. The test bin is composed of a roadway module and a surrounding rock module. The roadway module is horizontally inserted at the middle position of the surrounding rock module. The surrounding rock similar material is filled in the surrounding rock module, and the surrounding rock similar material is located around the roadway module. The loading system is a hydraulic loading structure, which is used for loading the surrounding rock similar material in the surrounding rock module to simulate different geological stress scenarios. The grouting system is connected with the roadway module to grout into the surrounding rock module to simulate the actual roadway grouting reinforcement process. A plurality of grouting holes 12 are formed in the roadway module. The grouting system is connected with the grouting holes 12 through the grouting pipes 14. The grouting pipes 14 and the grouting holes 12 are connected in a soft manner.

[0036] It can be understood that in the actual grouting process, the unused grouting holes 12 can be temporarily plugged according to the needs.

[0037] The loading system is composed of a counterforce frame and a loading mechanism, wherein the counterforce frame is composed of vertical beams 1, a cross beam 2 and a pressure plate 3, the vertical beams 1 are oppositely fixed (welded) on the pressure plate 3, and the top of the vertical beams 1 is fixedly connected through the cross beam 2.

[0038] The test bin is placed on the pressure plate 3 and between the two vertical beams 1, and the inner sides of the vertical beams 1 and the cross beam 2 are fixedly provided with a plurality of hydraulic cylinders 4, wherein the extension rods of the hydraulic cylinders 4 on the vertical beams 1 are connected with the side walls 5 of the adjacent test bins, and the hydraulic cylinders 4 on the vertical beams 1 can apply force to the corresponding side walls 5, and the extension rods of the hydraulic cylinders 4 on the cross beam 2 are fixedly provided with an upper cover plate 6, which is used to apply force to the surrounding rock similar material above the roadway module.

[0039] It can be understood that the hydraulic cylinders 4 on the vertical beams 1 and the cross beam 2 are independently controlled to provide different types of initial loads for the test in order to simulate the stress of the roadway surrounding rock under different working conditions.

[0040] The surrounding rock module is composed of side walls 5, a bottom plate 7, a front cover plate 8 and a rear cover plate 9, wherein the front cover plate 8 and the rear cover plate 9 are oppositely fixedly arranged on the bottom plate 7, and the front cover plate 8 and the rear cover plate 9 are both provided with a hole for installing the roadway module, and the holes for installing the roadway module on the front cover plate 8 and the rear cover plate 9 are coaxially arranged.

[0041] It can be understood that the front cover plate 8 and the rear cover plate 9 are both made of tempered glass, which provides convenience for pouring the roadway model sample and observing and recording the slurry diffusion law in real time.

[0042] The bottom plate 7 is welded with an angle steel 18, the bottom of the front cover plate 8, the rear cover plate 9 and the side walls 5 are inserted into the area enclosed by the angle steel 18 to be connected together with the bottom plate 7, the front cover plate 8 and the rear cover plate 9 are connected through bolts 20, the bolts 20 are tension bolts, the bottom plate 7 is placed on the pressure plate 3, and the bottom plate 7 and the pressure plate 3 can be fixed or not fixed, and the specific selection can be made according to the actual needs.

[0043] The side walls 5 are oppositely arranged between the front cover plate 8 and the rear cover plate 9, and the side walls 5 are perpendicular to the front cover plate 8 and the rear cover plate 9, and the side walls 5 are slidingly connected with the front cover plate 8 and the rear cover plate 9, so that the side walls 5 can move under the action of the hydraulic cylinders 4 on the vertical beams 1 to apply pressure to the surrounding rock similar material on the side of the roadway module.

[0044] It can be understood that the bolt 20 can limit the position of the side wall 5, preventing the side wall 5 from moving out of the test chamber when the hydraulic rod of the hydraulic cylinder 4 on the vertical beam 1 retracts.

[0045] As shown in the drawings, the roadway module is composed of the anchor rod 10, the roadway fixer 11, the roadway side plate 13, the roadway top plate 21 and the roadway bottom plate 22, the roadway side plate 13, the roadway top plate 21 and the roadway bottom plate 22 are combined to form a roadway model, the roadway model is a square tube structure with two open ends, and one roadway fixer 11 is arranged at each open end of the roadway model, so that the roadway side plate 13, the roadway top plate 21 and the roadway bottom plate 22 are fixedly connected by the roadway fixer 11. Figure 2

[0046] The roadway fixer 11 has a groove for inserting the roadway side plate 13, the roadway top plate 21 and the roadway bottom plate 22, and the roadway side plate 13, the roadway top plate 21 and the roadway bottom plate 22 are inserted between two oppositely arranged roadway fixers 11;

[0047] The diagonal position of each roadway fixer 11 is connected by a reinforcing column to improve the deformation resistance, and the inner side of the roadway fixer 11 has a protrusion with a set thickness, so that the protrusion can support part of the inner wall of the roadway model; the width of the roadway top plate 21 is equal to the width of the roadway bottom plate 22 plus the sum of the thicknesses of the two roadway side plates 13, that is, the bottom of the roadway top plate 21 is supported by the roadway side plate 13 to improve the deformation resistance of the roadway model.

[0048] A plurality of grouting holes 12 are formed in the roadway side plate 13 and the roadway top plate 21, the size of the grouting hole 12 is slightly larger than that of the grouting pipe 14, the grouting hole 12 and the grouting pipe 14 are sealed by a sealing ring 19 and the grouting pipe 14 is fixed, and in actual application, the grouting pipe 14 is fixed by the sealing ring 19 after being installed at a set angle to study the influence of different angles of the grouting pipe 14 on the grouting effect.

[0049] According to the diameter of the grouting hole 12, the diameter of the grouting pipe 14 and the wall thickness of the roadway side plate 13, the angle limit can be solved:

[0050] The angle can be obtained

[0051] Wherein, the thickness of the roadway side plate 13 is a, the diameter of the grouting hole 12 is b, and the diameter of the grouting pipe 14 is c.

[0052] A plurality of anchor rods 10 are arranged on the roadway side plate 13 and the roadway top plate 21, specifically, a plurality of insertion holes for installing the anchor rod 10 are arranged on the roadway side plate 13 and the roadway top plate 21, a roadway gasket 23 is sleeved on the anchor rod 10, one end of the anchor rod 10 extends into the similar material of surrounding rock, and the other end is inserted into the roadway model and fixed by a nut.​

[0053] The grouting system comprises a grouting pipe 14, a grouting hose 15, a grouting barrel 16 and an air compressor 17, wherein the grouting pipe 14 is connected with the grouting barrel 16 through the grouting hose 15, and the grouting barrel 16 is connected with the air compressor 17 through the grouting hose 16, so that the slurry in the grouting barrel 16 can be injected into the surrounding rock module through the grouting pipe 14.

[0054] As shown in Figure 3 , one end of the grouting pipe 14 is provided with external threads, and the grouting pipe 14 is connected with the grouting hose 15 in a threaded connection manner; a plurality of holes are uniformly arranged on the pipe body of the grouting pipe 14 along the circumferential direction and the axial direction, so as to uniformly inject the slurry into the surrounding rock module, and the grouting efficiency is greatly improved.

[0055] Embodiment 2

[0056] In another typical embodiment of the present application, a new type of roadway grouting reinforcement similar model test method is provided, which is as follows:

[0057] The test device is assembled in sequence (as shown in Figure 1 , Figure 2 ), the pressure bearing plate 3 is horizontally placed, the vertical beams 1 are symmetrically welded, the cross beams 2 are welded above the vertical beams 1, and the reaction frame structure is formed; the hydraulic rods 4 are uniformly arranged on the inner sides of the vertical beams 1 and the cross beams 2, and are welded and fixed, the bottom plate 7 of the corresponding size is arranged on the pressure bearing plate 3, and the angle steel 18 is welded around the bottom plate 7; the front cover plate 8, the rear cover plate 9 and the side wall 5 are inserted into the area surrounded by the angle steel 18, the front cover plate 8 and the rear cover plate 9 are fixed by the nuts 20, and the hydraulic cylinders 4 are adjusted so as to just abut against the side wall 5;

[0058] After the surrounding rock module is assembled, the surrounding rock similar material is added to the roadway bottom in the surrounding rock module, the roadway fixer 11 on one side is pre-set at the hole of the surrounding rock module, the plates are sequentially inserted into the grooves of the roadway fixer 11 in the order of top, two sides and bottom, the anchor rod 10 is pre-penetrated through the hole designed in the mold, the anchor rod is initially fixed, the anchor rod pad 23 is added outside the roadway model, so that the roadway pad 23 is attached to the outer wall of the simulated roadway, and another roadway fixer 11 is installed;

[0059] The grouting pipe 14 is pre-buried according to the pre-designed position, and the grouting hole 12 is plugged by the sealing ring 19, after which the surrounding rock similar material is added to the top end of the front cover plate 8 and the rear cover plate 9, so that the surrounding rock similar material encloses the roadway model;

[0060] The test piece is cast, the reasonable similar material mix proportion is selected by means of orthogonal test, and the front cover plate 8, the rear cover plate 9 and the side wall 5 are used as the casting mold;

[0061] The computer is used to control the hydraulic rod to apply the set initial load to the model test to simulate the stress of the roadway surrounding rock;

[0062] The grouting pipe 14 and the grouting hose 15 are connected, the other end of the grouting hose 15 is connected to the grouting barrel 16, and the air compressor 17 is connected to the other end of the grouting barrel 16 by means of the grouting hose 15 to form a grouting system; thereafter, the air compressor 17 is started to grout the model sample, and the grouting is stopped after the predetermined grouting effect is achieved, and after the grout is finally cured, the roadway floor 22, the roadway side plate 13 and the roadway roof 21 are removed in turn, the anchor rod is fixed again, and the grouting model sample is maintained;

[0063] After the grouting model sample is maintained, the formwork is removed, the drilling and coring are performed, the grouting reinforcement bodies in different positions are cut, sampled and numbered, and the mechanical properties of the grouting reinforcement body samples are measured.

[0064] The roadway gasket 23 is located outside the roadway model, and when the roadway model is removed, the anchor rod can be directly fixed with the surrounding rock through the nut, which reduces the difficulty of fixing and connecting the anchor rod 10 with the surrounding rock, that is, the roadway gasket 23 does not need to be installed again, which facilitates the fixing of the anchor rod 10.

[0065] Since the real roadway is not a flat plate, if the roadway model is not removed, a fixed boundary is added around the roadway, the real roadway is prone to hazards such as small sections and layers, and the removal of the roadway model can more truly restore and facilitate the observation of the deformation of the grouting model sample at the boundary of the roadway.

[0066] 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 modifications and changes. 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.

Claims

1. A novel roadway grouting reinforcement similar model test method, characterized in that, Specifically as follows: Increase the surrounding rock similar material to the hole bottom of the surrounding rock module in the surrounding rock module, assemble the roadway model at the hole of the surrounding rock module, pass the one end of the anchor rod into the roadway model and perform the primary fixation, and add the anchor rod pad on the anchor rod; According to the pre-designed position, pre-bury the grouting pipe and adjust the angle, block the grouting hole through the sealing ring, and add the surrounding rock similar material to the top end of the surrounding rock module; Control the hydraulic cylinder to apply the set initial load to simulate the roadway surrounding rock stress, and perform the grouting through the grouting pipe; Stop the grouting after the predetermined grouting effect is achieved, remove the roadway model after the grout is finally cured, and fix the anchor rod again, and maintain the grouting model sample; After the maintenance of the grouting model sample is completed, remove the formwork, drill the core, cut, sample and number the grouting reinforcement bodies at different positions, and measure the mechanical properties of the grouting reinforcement body sample.

2. The new roadway grouting reinforcement similar model test method according to claim 1, characterized in that, A new type of roadway grouting reinforcement similar model test device is adopted, which comprises a loading system, a test bin and a grouting system, the test bin is composed of a roadway module and a surrounding rock module, the roadway module is horizontally inserted at the middle position of the surrounding rock module, the surrounding rock module contains surrounding rock similar material, the loading system is used for loading the surrounding rock similar material in the surrounding rock module to simulate different geological stress scenarios; a plurality of grouting holes are formed in the roadway module, the grouting system is connected with the grouting holes through a grouting pipe, the size of the grouting hole is slightly larger than that of the grouting pipe, and the grouting hole and the grouting pipe are sealed and fixed through a sealing ring.

3. The new roadway grouting reinforcement similar model test method according to claim 2, characterized in that, The loading system is composed of a counterforce frame and a plurality of hydraulic cylinders, the surrounding rock module is placed on the counterforce frame, and the hydraulic cylinders are fixedly arranged on the counterforce frame to pressurize the surrounding rock similar material in the surrounding rock module.

4. The novel roadway grouting reinforcement similar model test method according to claim 2, characterized in that, The surrounding rock module is composed of a side wall, a bottom plate, a front cover plate and a rear cover plate, an angle steel is welded on the bottom plate, the front cover plate, the rear cover plate and the side wall are inserted in the area enclosed by the angle steel, the side wall is slidably connected between the front cover plate and the rear cover plate, and the front cover plate and the rear cover plate are both provided with a hole for mounting the roadway module.

5. The novel roadway grouting reinforcement similar model test method according to claim 2, characterized in that, The roadway module is composed of a roadway model and a plurality of anchor rods arranged on the roadway model, the anchor rods are inserted into the roadway model and fixed by nuts, the anchor rods are sleeved with roadway pads, and the roadway pads are located outside the roadway model.

6. The novel roadway grouting reinforcement similar model test method according to claim 5, characterized in that, The roadway model is composed of a roadway side plate, a roadway top plate and a roadway bottom plate, one roadway fixator is arranged at each opening end of the roadway model, and the roadway side plate, the roadway top plate and the roadway bottom plate are inserted between the two oppositely arranged roadway fixators.

7. The novel roadway grouting reinforcement similar model test method according to claim 6, characterized in that, The diagonal positions of the roadway fixators are connected by a reinforcing column, and the inner side of the roadway fixator has a protrusion with a certain thickness for supporting part of the inner wall of the roadway model.

8. The novel roadway grouting reinforcement similar model test method according to claim 6, characterized in that, The bottom of the roadway top plate is supported by the roadway side plate.

9. The novel roadway grouting reinforcement similar model test method according to claim 2, characterized in that, The grouting system is composed of a grouting pipe, a grouting barrel and an air compressor, and the grouting pipe and the grouting barrel and the grouting barrel and the air compressor are connected by a grouting hose.

10. The novel roadway grouting reinforcement similar model test method according to claim 2, characterized in that, A plurality of holes are uniformly formed on the pipe body of the grouting pipe along the circumferential direction and the axial direction.

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