A fault fracture zone reinforcement method based on self-expanding slurry

Abstract

The present invention discloses a fault fracture zone reinforcement method based on self-expanding slurry, including: determining the position of the fault fracture zone according to geological data and on-site investigation; drilling multiple anchor holes in a direction perpendicular to the fault fracture zone; placing a support pipe with multiple small holes on the side walls of multiple parts in the anchor holes to support the anchor holes; mixing expansive soil, phosphogypsum and cement to obtain a self-made self-expanding slurry; installing a grouting conduit in the support pipe, and injecting the self-expanding slurry into the fault fracture zone through the grouting conduit under high pressure, wherein the periphery of the grouting conduit is provided with multiple guide pipes, which are connected to the small holes of the support pipe; recovering the grouting conduit after the grouting is completed. The present invention relies on the expansibility of the self-expanding slurry to fill the gap inside the fracture zone, increase its internal cohesion, and connect the fault and the fracture zone into a whole, effectively enhancing its overall stability. At the same time, the method makes full use of undesirable substances such as expansive soil and phosphogypsum to avoid environmental pollution.

Description

Technical Field

[0001] The invention relates to the technical field of geotechnical engineering reinforcement, and in particular to a fault fracture zone reinforcement method based on self-expanding slurry. Background Art

[0002] With the construction of national infrastructure and the acceleration of the pace of life of the people, shortening the travel time between regions has become a social consensus. The planning and construction of multiple high-speed rail lines also means strict requirements on the quality of tunnel construction and the reduction of construction period. In the planning and construction, it is inevitable to encounter fault areas. At this time, it is particularly important to study the stability and reinforcement measures of faults and their fracture zones. It is conducive to controlling the quality of the project from the source, greatly shortening the construction period, and reducing the losses caused by engineering accidents.

[0003] In the prior art, the stability of the fault itself and the stability of the fault fracture zone are poor, and the fracture zone is prone to slippage, causing the fault to slide significantly and causing natural disasters.

[0004] Therefore, it is necessary to develop a fault fracture zone reinforcement method based on self-expanding slurry to solve the problem of easy slippage of the fracture zone in the prior art. Currently, there is no method that uses expansive soil and phosphogypsum as raw materials to configure them into self-expanding slurry and utilize their characteristics of swelling when exposed to water to generate expansion force to achieve the purpose of reinforcing the stability of the fault and its fracture zone. Summary of the invention

[0005] The purpose of the present invention is to provide a fault fracture zone reinforcement method and system based on self-expanding slurry, which can effectively improve the stability of the fault fracture zone while meeting the stability of the fault itself, prevent the fracture zone from further slipping, reduce the possibility of local deformation, and prevent the fracture zone from slipping and causing the fault to slide significantly, thereby causing natural disasters.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] In a first aspect of the present invention, a fault fracture zone reinforcement method based on self-expanding slurry is provided, the method comprising:

[0008] Determine the location of the fault based on the geological data collected locally and on-site investigation;

[0009] Drilling a plurality of anchor holes downwardly at the position of the fault in a direction perpendicular to the fault;

[0010] Placing a plurality of support tubes in the plurality of anchor holes in a one-to-one correspondence, wherein a plurality of small holes are provided on the side walls of the plurality of support tubes located in the fracture zone of the fault;

[0011] The expansive soil, phosphogypsum and cement are mixed to obtain a homemade self-expanding slurry;

[0012] A plurality of grouting conduits are installed one by one in the plurality of support tubes, and the self-made self-expanding slurry is injected into the fracture zone of the fault through the grouting conduits under high pressure; wherein a plurality of guide tubes are arranged on the periphery of the grouting conduits, and the plurality of guide tubes are connected one by one with the plurality of small holes of the support tubes;

[0013] After the grouting is completed, the grouting conduit is taken out to complete the overall reinforcement of the fault fracture zone.

[0014] Furthermore, the bottom of the support tube is sealed with a thick steel sheet.

[0015] Furthermore, the support pipe is connected to the fracture zone of the fault through the small hole.

[0016] Furthermore, the grouting conduit comprises:

[0017] A grouting conduit body, wherein a plurality of flow guide tubes are arranged on the periphery of the middle portion of the grouting conduit body, and the plurality of flow guide tubes are connected to the plurality of small holes of the support tube in a one-to-one correspondence;

[0018] The bottom support rod is located at the bottom of the grouting conduit body.

[0019] Furthermore, the self-made self-expanding slurry is injected into the fracture zone of the fault through the grouting conduit under high pressure, and the self-expanding slurry is introduced into the grouting machine and injected under high pressure.

[0020] Furthermore, the diameter of each of the small holes in the support tube is in the range of 2 to 4 cm, and the shape of the small hole includes one of a circle, a triangle, and a quadrilateral.

[0021] Furthermore, the inner diameter of the support tube ranges from 2 to 5 cm, and the wall thickness ranges from 1 to 3 cm.

[0022] In a second aspect of the present invention, a fault zone reinforcement system based on self-expanding slurry is provided, the system comprising:

[0023] A plurality of anchor holes are arranged at the position of the fault along a direction perpendicular to the fault;

[0024] A plurality of support tubes are placed in the plurality of anchor holes in a one-to-one correspondence; a plurality of small holes are provided on the side wall of the middle portion of the support tube, and the support tube is connected to the fracture zone of the fault through the small holes;

[0025] A plurality of grouting conduits are installed in the plurality of supporting tubes in a one-to-one correspondence; a plurality of guide tubes are arranged on the outer periphery of the middle part of the grouting conduits, and the plurality of guide tubes are connected with the plurality of small holes of the supporting tubes in a one-to-one correspondence; and a self-expanding slurry is arranged in the plurality of grouting conduits.

[0026] The self-made self-expanding slurry includes expansive soil, phosphogypsum, cement and water, which are mixed in a certain ratio, where expansive soil: phosphogypsum: cement = x:y:z. Due to the characteristics of expansive soil and phosphogypsum swelling when in contact with water, the self-expanding slurry will continue to expand outward under the action of the swelling force, filling the gaps in the fault fracture zone, enhancing the stability of the fracture zone, and achieving the effect of reinforcing the fault fracture zone. In addition, for fracture zones in different situations, the ratio of x:y:z is different, the purpose is to ensure that the self-expanding slurry generates sufficient swelling force to fill the gaps in the fault fracture zone, and to prevent the occurrence of fault fracture zone slip due to excessive swelling force generated by the self-expanding slurry.

[0027] The self-made self-expanding slurry is a non-Newtonian fluid. By utilizing the characteristics of the non-Newtonian fluid layer that becomes stronger when encountering strong forces and weaker when encountering weak forces, the capacity of the external load F2 (such as seismic waves, impact loads, etc.) can be evenly dissipated, and at the same time, a reflection and refraction surface can be formed to achieve the effect of equalizing the force and weakening its destructive ability, effectively preventing further damage to the fault fracture zone and improving the stability of the fault.

[0028] The expansion force F1 of the self-expanding slurry and the confining pressure inside the fracture zone will form a new equilibrium system, and the two are in opposite directions. Since there is the expansion force F1 of the self-expanding slurry inside the fracture zone, when it is subjected to the external load F2, the expansion force F1 can offset part of the external load and improve the stability of the fault fracture zone.

[0029] In the self-made self-expanding slurry, the swelling property of expansive soil and phosphogypsum in contact with water brings great harm to the project and the environment, and they are bad materials and waste in actual projects. However, in the present invention, the swelling property of expansive soil and phosphogypsum in contact with water is utilized to make them serve as the raw materials of the self-expanding slurry, which not only improves the utilization rate of expansive soil and phosphogypsum and turns waste into treasure, but also the self-made self-expanding slurry can generate expansion force, and with the help of its expansion force, the self-expanding slurry can continuously expand and fill the fault fracture zone, thereby achieving the effect of reinforcing the stability of the fault.

[0030] One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0031] 1. The method of the present invention uses expansive soil and phosphogypsum as raw materials to make a self-expanding slurry, and utilizes its own expansibility to expand the slurry into various gaps in the fault fracture zone, fully filling the fracture zone, achieving the effect of reinforcing the fault, and enhancing its bearing capacity, thereby achieving the reinforcement effect of improving the overall stability of the soft rock or soil.

[0032] 2. The self-expanding slurry prepared in the method of the present invention is a non-Newtonian fluid. By utilizing the characteristics of a non-Newtonian fluid, when subjected to an external load (such as an earthquake, an explosion shock wave, etc.), the self-expanding slurry can act as a buffer layer to reduce the propagation speed of the external load shock wave and weaken its propagation energy, thereby improving the overall stability of the fault and the rock and soil mass, effectively reducing the probability of fault activation, and further improving the ability to prevent natural disasters such as earthquakes caused by fault activation.

[0033] 3. The support pipe in the method of the present invention is not only a grouting carrier supported by the grouting conduit, but also can act as an anchor rod or anchor cable to reinforce the fault fracture zone, improve the stability of the fault, and further enhance the stability of the fault and the rock and soil body.

[0034] 4. The method of the present invention can increase the expansibility of the expansive soil slurry itself by adding phosphogypsum into the slurry, which not only improves the recycling of phosphogypsum, solves the ecological problem of soil and groundwater pollution in the surrounding environment caused by phosphogypsum, and greatly saves engineering costs, but also improves the expansion performance of the slurry itself, so that the slurry can give full play to its expansibility and fully fill the gaps in the fault fracture zone, thereby improving the stability of the fault.

[0035] 5. In this method, the expansive soil and phosphogypsum are not only easy to obtain and operate, but can also greatly save construction costs, shorten construction period, and speed up construction progress. Moreover, they can improve the recycling of expansive soil and phosphogypsum, solve the pollution problem of soil and groundwater in the surrounding environment caused by phosphogypsum, and at the same time improve the safety reserve of faults, which has a broad prospect for engineering application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 This is a schematic diagram of the structure of a fault fracture zone reinforcement system based on self-expanding slurry according to an embodiment of the present invention; or a schematic diagram of grouting in a fault fracture zone;

[0038] Figure 2 Schematic diagram of grouting in the support pipe;

[0039] Figure 1-2 Figure numerals: 1-anchor hole; 2-support tube; 21-small hole; 22-sealed end; 3-grouting conduit; 31-grouting conduit body; 311-guiding tube; 32-bottom support rod; 4-self-made self-expanding slurry;

[0040] Figure 3 It is a schematic diagram of the local force of the fault fracture zone under external load;

[0041] Figure 4 The present invention provides a flow chart of a fault fracture zone reinforcement method based on self-expanding slurry. DETAILED DESCRIPTION

[0042] The present invention will be described in detail below in conjunction with specific implementations and examples, and the advantages and various effects of the present invention will be more clearly presented. It should be understood by those skilled in the art that these specific implementations and examples are used to illustrate the present invention, rather than to limit the present invention.

[0043] Throughout the specification, unless otherwise specifically stated, the terms used herein should be understood as meanings commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. In the event of a conflict, the present specification takes precedence.

[0044] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or obtained by existing methods.

[0045] The technical solution of the embodiment of the present application is to solve the above technical problems, and the overall idea is as follows:

[0046] According to a typical embodiment of the present invention, a fault fracture zone reinforcement method based on self-expanding slurry is provided, such as Figure 3 As shown, the method includes:

[0047] Step S1, determine the location of the fault based on the local geological data collected and on-site investigation;

[0048] Specifically, based on the geological data collected locally and on-site investigations, the occurrence (strike, dip, and inclination) of the fault plane is first measured. Secondly, the direction of relative displacement of the two sides of the fault must be determined, so that the nature of the fault (normal, reverse, etc.) can be determined.

[0049] Step S2, drilling a plurality of anchor holes downward at the position of the fault in a direction perpendicular to the fault;

[0050] In the above technical solution,

[0051] The plurality of anchor holes are evenly distributed at the position of the fault fracture zone, which is beneficial to increase the stability of the fault fracture zone and facilitate construction;

[0052] Step S3, placing a plurality of support tubes in the plurality of anchor holes in a one-to-one correspondence, wherein a plurality of small holes are provided on the side walls of the plurality of support tubes located in the fracture zone of the fault;

[0053] In the step S3,

[0054] The support pipe is retained in the anchor hole and grouting is performed inside the anchor hole, so as to achieve the effect of doubly reinforcing the fault fracture zone together with the self-expanding slurry in the fault fracture zone.

[0055] The side wall of the support pipe is processed with the small hole to facilitate the installation and grouting of the grouting conduit;

[0056] The diameter of each of the small holes in the support tube is in the range of 2 to 4 cm, and the shape of the small hole includes one of a circle, a triangle, and a quadrilateral.

[0057] Step S4, mixing the expansive soil, phosphogypsum and cement to obtain a self-expanding slurry;

[0058] The self-expanding slurry includes expansive soil, phosphogypsum, cement and water, which are mixed in a certain proportion, wherein expansive soil: phosphogypsum: cement = x: y: z. For different broken zones, the ratio of x: y: z is different, and the stability of the broken zone is judged according to the weathering degree of the rock in the broken zone and the single and triaxial tests of the rock. Expansive soil: phosphogypsum: cement = x: y: z, wherein the ranges of x and y are both 2 to 40, the range of z is 1 to 10, and z < x, z < y. That is, the weight ratio of expansive soil: phosphogypsum: cement is (2 to 40): (2 to 40): (1 to 10); wherein when the material in the broken zone is relatively stable, the ratio of expansive soil and phosphogypsum increases relatively, and vice versa, the ratio of expansive soil and phosphogypsum decreases relatively, but the ratio after increase and decrease must also meet the above weight ratio.

[0059] The purpose is to ensure that the self-expanding slurry generates sufficient expansion force to fill the gaps in the fault fracture zone, and to prevent the expansion force generated by the self-expanding slurry from being too large and causing the fault fracture zone to slip. Due to the characteristics of expansive soil and phosphogypsum swelling when exposed to water, the self-expanding slurry will continue to expand outward under the action of the expansion force, filling the gaps in the fault fracture zone, enhancing the stability of the fracture zone, and achieving the effect of reinforcing the fault fracture zone.

[0060] The self-made self-expanding slurry is a non-Newtonian fluid. By utilizing the characteristics of the non-Newtonian fluid layer that it becomes stronger when it encounters strong forces and weaker when it encounters weak forces, the capacity of the external load F2 (such as seismic waves, impact loads, etc.) can be evenly dissipated, and at the same time, a reflection and refraction surface can be formed, thereby achieving the effect of equalizing the force and weakening its destructive capacity, effectively preventing the fault fracture zone from being further damaged and improving the fault stability.

[0061] The expansion force F1 of the self-expanding slurry and the confining pressure inside the fracture zone will form a new equilibrium system, and the two are in opposite directions. Since the expansion force F1 of the self-expanding slurry exists inside the fracture zone, when it is subjected to the external load F2, the expansion force F1 can offset part of the external load and improve the stability of the fault fracture zone.

[0062] The expansive soil and phosphogypsum in the self-made self-expanding slurry have the property of swelling in water, which brings great harm to the project and the environment, and are bad materials, and are waste in actual projects. However, in the present invention, the property of swelling in water of the expansive soil and phosphogypsum is utilized to make them serve as the raw materials of the self-expanding slurry, which not only improves the utilization rate of the expansive soil and phosphogypsum, turning waste into treasure, but also the self-made self-expanding slurry can generate expansion force, and with the help of the expansion force, the self-expanding slurry can continuously expand and fill the fault fracture zone, thereby achieving the effect of reinforcing the stability of the fault.

[0063] Step S5, installing a plurality of grouting conduits in a one-to-one correspondence in a plurality of the support tubes, and injecting the self-expanding slurry into the fracture zone of the fault through the grouting conduits under high pressure; wherein a plurality of guide tubes are provided on the periphery of the grouting conduits, and the plurality of guide tubes are in one-to-one correspondence with the plurality of small holes of the support tubes;

[0064] In the above technical solution, the multiple guide tubes are connected to the multiple small holes of the support tube in a one-to-one correspondence, which is convenient for connecting the grouting conduit and the small holes on the side wall of the support tube, realizing multi-layer simultaneous grouting, which not only improves the grouting speed but also meets the grouting requirements.

[0065] Step S6: After the grouting is completed, the grouting conduit is taken out to complete the overall reinforcement of the fault fracture zone.

[0066] In the above steps S1-S6, the order can be adjusted according to the situation.

[0067] For example, one anchor hole may be drilled first, and steps S3-S6 may be performed for this anchor hole; then another anchor hole may be drilled and steps S3-S6 may be performed; until multiple anchor holes are completed, the fault fracture zone may be integrally reinforced.

[0068] For example, multiple anchor holes may be drilled first, and steps S3-S6 may be performed for one anchor hole first; then steps S3-S6 may be performed for another anchor hole; until multiple anchor holes are completed, the fault fracture zone may be integrally reinforced.

[0069] According to another typical embodiment of the present invention, a fault fracture zone reinforcement system based on self-expanding slurry is provided. Figure 1 As shown, the system comprises:

[0070] A plurality of anchor holes 1 are arranged at the position of the fault along a direction perpendicular to the fault;

[0071] A plurality of support tubes 2 are placed in the plurality of anchor holes 1 in a one-to-one correspondence; a plurality of small holes 21 are provided on the side wall of the middle portion of the support tube 2, and the support tube 2 is connected to the fracture zone of the fault through the small holes 21;

[0072] A plurality of grouting conduits 3 are installed one by one in the plurality of steel pipes 2; a plurality of guide tubes 31 are provided on the periphery of the middle part of the grouting conduits 3, and the plurality of guide tubes are connected one by one with the plurality of small holes of the support pipe; a self-expanding slurry 4 is provided in the plurality of grouting conduits.

[0073] Furthermore, the grouting conduit 3 comprises:

[0074] A grouting conduit body 31, wherein a plurality of guide tubes 311 are provided on the periphery of the middle portion of the grouting conduit body 31, and the plurality of guide tubes are connected to the plurality of small holes of the support tube in a one-to-one correspondence;

[0075] The bottom support rod 32 is located at the bottom of the grouting conduit body 31 .

[0076] Furthermore, the bottom of the support tube 2 has a sealed end 22 .

[0077] A fault fracture zone reinforcement method based on self-expanding slurry of the present application will be described in detail below in combination with embodiments, comparative examples and experimental data.

[0078] Example 1: A method for reinforcing a fractured zone based on self-expanding slurry

[0079] The specific steps for the reinforcement of areas with low rock weathering degree in the broken zone are as follows:

[0080] Step 1: Through the geological data collected locally and on-site investigation, the location and type of the fault are roughly determined. Then, the drilling equipment is used. The drilling rig requires accurate positioning of the drill bit. When there is no design requirement, the final hole position deviation is no more than 10 cm, and the hole inclination error is no more than 2%. The anchor hole is drilled downward in the direction perpendicular to the fault until the designed depth.

[0081] Step 2: After drilling is completed, place the support pipe in the anchor hole to prevent hole collapse and prepare for grouting;

[0082] Step 3: prepare the expansive soil, phosphogypsum and cement in a ratio of 4:3:1 into a self-expanding slurry for later use;

[0083] Step 4: Install the grouting pipe with multiple conduits into the support pipe, and introduce the configured self-expanding slurry into the high-pressure grouting machine. Use high pressure (3-5MPa) to inject the self-expanding slurry into the fault fracture zone from the grouting pipe with multiple conduits, and pour the self-expanding slurry in the support pipe, and seal the upper part with plain cement slurry with a thickness of 15-20cm;

[0084] Step 5: After the grouting is completed, take out the grouting conduit with multiple conduits and pour the next anchor hole;

[0085] Step 6: Repeat steps 3 to 4, and flush and recover the grouting conduit with multiple conduits, and finally complete the overall reinforcement system layout for the fault fracture zone.

[0086] Example 2: A method for reinforcing a fractured zone based on self-expanding slurry

[0087] The specific steps for the reinforcement of areas with low rock weathering degree in the broken zone are as follows:

[0088] Step 1: Through the geological data collected locally and on-site investigation, the location and type of the fault are roughly determined. Then, the drilling equipment is used. The drilling rig requires accurate positioning of the drill bit. When there is no design requirement, the final hole position deviation is no more than 10 cm, and the hole inclination error is no more than 2%. The anchor hole is drilled downward in the direction perpendicular to the fault until the designed depth.

[0089] Step 2: After drilling is completed, place the support pipe in the anchor hole to prevent hole collapse and prepare for grouting;

[0090] Step 3: prepare the self-expanding slurry by mixing the expansive soil, phosphogypsum and cement in a ratio of 2:2:1 for later use;

[0091] Step 4: Install the grouting pipe with multiple conduits into the support pipe, and introduce the configured self-expanding slurry into the high-pressure grouting machine. Use high pressure (3-5MPa) to inject the self-expanding slurry from the grouting pipe with multiple conduits into the fault fracture zone. While pouring the self-expanding slurry, pull out the support pipe upwards, and pour traditional mortar into the anchor hole.

[0092] Step 5: After the grouting is completed, take out the grouting conduit with multiple conduits and pour the next anchor hole;

[0093] Step 6: Repeat steps 3 to 4, and flush and recover the grouting conduit and support pipe with multiple conduits, and finally complete the overall reinforcement system layout for the fault fracture zone.

[0094] Example 3: A method for reinforcing a fractured zone based on self-expanding slurry

[0095] The specific steps for strengthening the severely weathered rock areas in the broken zone are as follows:

[0096] Step 1: Through the geological data collected locally and on-site investigation, the location and type of the fault are roughly determined. Then, the drilling equipment is used. The drilling rig requires accurate positioning of the drill bit. When there is no design requirement, the final hole position deviation is no more than 10 cm, and the hole inclination error is no more than 2%. The anchor hole is drilled downward in the direction perpendicular to the fault until the designed depth.

[0097] Step 2: After drilling is completed, place the support pipe in the anchor hole to prevent hole collapse and prepare for grouting;

[0098] Step 3: prepare the expansive soil, phosphogypsum and cement in a ratio of 40:40:1 into a self-expanding slurry for later use;

[0099] Step 4: Install the grouting pipe with multiple conduits into the support pipe, and introduce the configured self-expanding slurry into the high-pressure grouting machine. Use high pressure (1-3MPa) to inject the self-expanding slurry from the grouting pipe with multiple conduits into the fault fracture zone, and pour the self-expanding slurry in the support pipe, and seal the upper part with plain cement slurry with a thickness of 15-20cm;

[0100] Step 5: After the grouting is completed, take out the grouting conduit with multiple conduits and pour the next anchor hole;

[0101] Step 6: Repeat steps 3 to 4, and flush and recover the grouting conduit and support pipe with multiple conduits, and finally complete the overall reinforcement system layout for the fault fracture zone.

[0102] Example 4: A method for reinforcing a fractured zone based on self-expanding slurry

[0103] The specific steps for strengthening the severely weathered rock areas in the broken zone are as follows:

[0104] Step 1: Through the geological data collected locally and on-site investigation, the location and type of the fault are roughly determined. Then, the drilling equipment is used. The drilling rig requires accurate positioning of the drill bit. When there is no design requirement, the final hole position deviation is no more than 10 cm, and the hole inclination error is no more than 2%. The anchor hole is drilled downward in the direction perpendicular to the fault until the designed depth.

[0105] Step 2: After drilling is completed, place the support pipe in the anchor hole to prevent hole collapse and prepare for grouting;

[0106] Step 3: prepare a self-expanding slurry by mixing expansive soil, phosphogypsum and cement in a ratio of 4:4:1 for later use;

[0107] Step 4: Install the grouting pipe with multiple conduits into the support pipe, and introduce the configured self-expanding slurry into the high-pressure grouting machine. Use high pressure (1-3MPa) to inject the self-expanding slurry from the grouting pipe with multiple conduits into the fault fracture zone, and pour the self-expanding slurry in the support pipe, and seal the upper part with plain cement slurry with a thickness of 15-20cm;

[0108] Step 5: After the grouting is completed, take out the grouting conduit with multiple conduits and pour the next anchor hole;

[0109] Step 6: Repeat steps 3 to 4, and flush and recover the grouting conduit and support pipe with multiple conduits, and finally complete the overall reinforcement system layout for the fault fracture zone.

[0110] Comparative Example 1

[0111] The comparative example can be a traditional method, which is as follows:

[0112] Step 1: Through the geological data collected locally and on-site investigation, the location and type of the fault are roughly determined. Then, the drilling equipment is used. The drilling rig requires accurate positioning of the drill bit. When there is no design requirement, the final hole position deviation is no more than 10 cm, and the hole inclination error is no more than 2%. The anchor hole is drilled downward in the direction perpendicular to the fault until the designed depth.

[0113] Step 2: After drilling is completed, place the support pipe in the anchor hole to prevent hole collapse and prepare for grouting;

[0114] Step 3: Prepare ordinary mortar for use;

[0115] Step 4: Install the grouting conduit with multiple conduits into the support pipe, and introduce the prepared common mortar into the high-pressure grouting machine. Use high pressure (3-5MPa) to inject the common mortar from the grouting conduit with multiple conduits into the fault fracture zone, and pour the common mortar in the support pipe;

[0116] Step 5: After the grouting is completed, take out the grouting conduit with multiple conduits and pour the next anchor hole;

[0117] Step 6: Repeat steps 3 to 4, and flush and recover the grouting conduit and support pipe with multiple conduits;

[0118] Step 7: Place the common grouting conduit into the support pipe and start grouting, finally completing the overall reinforcement system layout for the fault fracture zone.

[0119] In summary, compared with comparative example 1, the homemade expansive slurry of embodiments 1-4 of the present invention can expand and extend into the fault fracture zone by relying on its expansion force, and bond with the broken stones in the fracture zone to improve the internal cohesion of the fracture zone, thereby achieving a good reinforcement effect on the overall stability of the fault fracture zone.

[0120] Finally, it should be noted that the terms "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements that are inherent to such process, method, article, or apparatus.

[0121] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0122] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A fault fracture zone reinforcement method based on self-expanding slurry, characterized in that: The method comprises: Determine the location of the fault zone based on the geological data collected locally and on-site investigation; Drilling a plurality of anchor holes downwardly at the position of the fault fracture zone in a direction perpendicular to the fault; Placing a plurality of support tubes in the plurality of anchor holes in a one-to-one correspondence, wherein a plurality of support tubes are provided with a plurality of small holes on the side walls of the fracture zone of the fault; The expansive soil, phosphogypsum and cement are mixed to obtain a homemade self-expanding slurry; A plurality of grouting conduits are installed one by one in the plurality of support pipes, and the self-expanding slurry is injected into the fracture zone of the fault through the grouting conduits under high pressure; wherein a plurality of guide pipes are arranged on the periphery of the grouting conduits, and the plurality of guide pipes are connected one by one with the plurality of small holes in the support pipes; After the grouting is completed, the grouting conduit is taken out to complete the overall reinforcement of the fault fracture zone; The grouting conduit comprises: A grouting conduit body, wherein a plurality of flow guide tubes are arranged on the periphery of the middle portion of the grouting conduit body, and the plurality of flow guide tubes are connected to the plurality of small holes of the support tube in a one-to-one correspondence; A bottom support rod, located at the bottom of the grouting conduit body; The self-made self-expanding slurry includes expansive soil, phosphogypsum and cement, which are mixed in a certain proportion, wherein expansive soil: phosphogypsum: cement = x:y:z, wherein the ranges of x and y are both 2 to 40, the range of z is 1 to 10, and z<x, z<y.

2. A fault fracture zone reinforcement method based on self-expanding slurry according to claim 1, characterized in that: The bottom of the support tube is sealed with a thick steel sheet.

3. A fault fracture zone reinforcement method based on self-expanding slurry according to claim 1, characterized in that: The support pipe is connected with the fracture zone of the fault through the small hole.

4. A fault fracture zone reinforcement method based on self-expanding slurry according to claim 1, characterized in that: The self-expanding slurry is injected into the fracture zone of the fault through the grouting conduit under high pressure, and the self-expanding slurry is introduced into the grouting machine and injected under high pressure.

5. The fault fracture zone reinforcement method based on self-expanding slurry according to claim 1 is characterized in that: The diameter of each of the small holes in the support tube is in the range of 2 to 4 cm, and the shape of the small hole includes one of a circle, a triangle, and a quadrilateral.

6. A fault fracture zone reinforcement method based on self-expanding slurry according to claim 1, characterized in that: The inner diameter of the support tube is in the range of 2 to 5 cm, and the wall thickness is in the range of 1 to 3 cm.

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