Fault tectonic zone fixed-point target precise grouting reinforcement method

Abstract

The invention discloses a fault-added tectonic zone fixed-point target precise grouting reinforcement method which comprises the following steps: (1) fault exploration, (2) drilling precise construction and target positioning, (3) stop-grouting plug lowering and setting: construction is performed through a drilling high-pressure balloon stop-grouting plug system which comprises a drilling high-pressure balloon stop-grouting plug device; the drilling high-pressure balloon grouting stopping plug device comprises a hollow pipe and a high-pressure balloon body. The device further comprises a pressure pump; connecting the drilling high-pressure balloon stop-grouting plug device with a drilling rod, and lowering the drilling high-pressure balloon stop-grouting plug device to a preset setting position; high-pressure liquid is injected into the high-pressure balloon to form a high-pressure sealed grouting chamber; (4) targeted grouting operation is conducted, specifically, grouting materials are pumped into the target area through a center grouting channel of the stop-grouting plug; and (5) pipeline cleaning and equipment recovery. Fixed-point target area grouting is originally adopted, and the defects that traditional fault treatment difficulty is large, construction difficulty is large, construction cost is high, the treatment effect is poor, and after treatment is completed, the stoping operation risk is still high are fundamentally overcome.

Description

Technical Field

[0001] This invention belongs to the field of underground fault treatment technology in coal mining, and particularly relates to a method for precise grouting reinforcement of fault structures at fixed target areas. Background Technology

[0002] In the process of coal mining, reverse faults often occur in the mining face area. If reverse faults are not effectively dealt with, it will not only increase the risk of mining operations, but also seriously affect mining efficiency.

[0003] Therefore, to address reverse faults, existing technologies involve investigating the fault's distribution, shape, and elevation difference (between the hanging wall and footwall) to determine its development and formulate a treatment plan. Currently, the primary method for treating reverse faults is pre-grouting reinforcement. However, the following technical problems arise during this process: 1. All fissures in the borehole serve as diffusion channels for the grout. That is, when cement grout is injected into the borehole, the fissures in the borehole (fissures formed by the underground rock structure) prevent the grout from reaching a stable injection pressure. 2. This results in a large amount of grout penetrating into the cracks, making it impossible to effectively fill the fracture zone of the reverse fault with grout. In other words, the "targeting" is very poor. This defect also leads to a small amount of effective grout in the "target" area of ​​the fracture zone, resulting in a poor reinforcement effect of the fracture zone.

[0004] 3. Grout that seeps freely along fissures can easily cause blockages in high-level gas extraction boreholes and "110" work sites. The practice of drilling holes in the alleyway using the "law" method has impacted the management of other disasters.

[0005] 4. The accuracy of fault exploration is very poor.

[0006] Currently, there is no economical, effective, and efficient method to address the aforementioned technical problems related to underground reverse faults. Summary of the Invention

[0007] Based on the above background, the purpose of this invention is to provide: a method for precise grouting reinforcement of fault structures with fixed target areas.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: (1) Fault exploration: (2) Precise drilling and target positioning: Based on fault exploration data, grouting boreholes are drilled to a predetermined depth to ensure that the borehole terminal penetrates the fault fracture zone and to determine the target area corresponding to the fault fracture zone. (3) Lowering and sealing the stop plug: Construction is carried out using a high-pressure balloon grout stop system for borehole drilling. The high-pressure balloon grout stop system for borehole drilling includes a high-pressure balloon grout stop device, which includes a hollow tube and a high-pressure balloon body fixedly connected to the outer wall of the hollow tube. It also includes a borehole pressurization control unit. The borehole pressurization control unit includes a pressurization pump, which is connected to a high-pressure hose, and the high-pressure hose is connected to the high-pressure balloon body. Connect the high-pressure balloon grout stopper device to the drill rod and lower it to the predetermined setting position. The setting position is located in the intact rock layer on the upper plate of the fault plane, 10m away from the fracture zone. High-pressure liquid is injected into the high-pressure balloon through the borehole control unit, so that the high-pressure balloon expands radially and fits tightly against the borehole wall to form a high-pressure sealed grouting chamber, thereby achieving physical isolation between the target area and the non-target area. (4) Targeted grouting operation: Pump grouting material into the target area through the central grouting channel of the grout stop plug. The grouting pressure is steadily increased to the design final pressure of 10-10.5MPa and maintained in a stable state until the grout fully penetrates. The grouting material is K1 type mining inorganic grouting material, and its initial setting time is 15-20 minutes. (5) Pipeline cleaning and equipment recovery: After the final pressure of grouting is reached, pump clean water to flush the drill rod and the internal channel of the grout stop plug for 1-2 minutes; after the grouting material has initially set, release the pressure inside the high-pressure balloon to cause the high-pressure balloon to contract, and use the drilling machine to recover the entire high-pressure balloon grout stop plug device from the hole.

[0009] Preferably, the orifice pressurization control unit also includes a pressure gauge for monitoring water pressure and a pressure relief valve.

[0010] Preferably, a connector for connecting and mating drill rods is installed at the liquid inlet end of the hollow tube.

[0011] Preferably, the high-pressure liquid is clean water.

[0012] Preferably, the sealing pressure of the high-pressure balloon after expansion is not less than 1.2 times the final grouting pressure, and the high-pressure balloon can release water and relieve pressure after grouting.

[0013] Preferably, the fault exploration method includes three-dimensional seismic exploration and drilling exploration; The drilling exploration includes a first drilling exploration and a second drilling exploration. The first drilling exploration involves drilling three holes at an azimuth of 334°, namely T1-1, T1-2 and T1-3. Three boreholes were drilled at an azimuth of 311°, namely boreholes T2-1, T2-2 and T2-3.

[0014] Preferably, the oblique angles of T1-1, T1-2, and T1-3 are 12°, 7°, and 7°, respectively; The oblique angles of T2-1, T2-2 and T2-3 are 13°, 8° and 10° respectively.

[0015] Preferably, the second drilling exploration operation involves drilling three holes at an azimuth of 156°, namely holes Z1-1, Z1-2, and Z1-3. Three boreholes were drilled at an azimuth of 120°, namely boreholes Z2-1, Z2-2 and Z2-3.

[0016] Preferably, the oblique angles of Z1-1, Z1-2, and Z1-3 are +6°, -13°, and 0°, respectively; The oblique angles of Z2-1, Z2-2 and Z2-3 are +8°, ​​+1° and -10°, respectively.

[0017] Preferably, the drilling lengths of T1-1, T1-2, and T1-3 are 123m, 114m, and 130m, respectively; The drilling lengths of T2-1, T2-2, and T2-3 are 133m, 111m, and 123m, respectively; the drilling lengths of Z1-1, Z1-2, and Z1-3 are 60m, 60m, and 75m, respectively. The drilling lengths of Z2-1, Z2-2 and Z2-3 are 73m, 70m and 82m, respectively.

[0018] The present invention has the following beneficial effects: 1. The targeted grouting fault reinforcement technology has achieved multi-hazard coordinated management. While ensuring that the high-level gas extraction boreholes and the "110 method" roadway cutting boreholes are not affected, it has improved the fault grouting reinforcement effect, and the fault fracture zone has been effectively grouted and reinforced.

[0019] 2. In terms of economic benefits, it not only saves on the cost of orifice pipes and auxiliary materials, but also fundamentally eliminates the safety risks caused by the casing left over from the working face during mining.

[0020] Meanwhile, compared with traditional operation methods, it saves time on the use of pipes and other equipment, as well as subsequent grouting, curing and hole cleaning time, because it does not require a large number of pipes. After the bare hole construction is in place, the sealing device can be directly installed to grout and reinforce the fault, which increases the construction efficiency by 3 to 5 times.

[0021] This also reduced pressure relief issues along the grouting route of long boreholes, allowing for concentrated pressure for precise grouting reinforcement of fault fracture zones; it also enabled coordinated management of multiple hazards, ensuring that high-level gas extraction boreholes and "110 method" roadway cutting boreholes were not affected.

[0022] After adopting the targeted grouting fault reinforcement technology, the fault fracture zone was effectively filled and reinforced with grout. No more spalling, sinking, or truck jamming occurred near the working face structural zone, and the mining speed significantly increased from 1 cut per day to 9.5 cuts per day, indicating that the fault fracture zone was effectively reinforced with grout. The original plan was to cross the DF131 reverse fault in 80 days; now it only takes 50 days, increasing raw coal production by hundreds of thousands of tons and generating more significant economic benefits.

[0023] 3. This invention uniquely adopts fixed-point target grouting, which fundamentally solves the shortcomings of traditional fault treatment, such as high difficulty in construction, high construction cost, poor treatment effect, and still high risk in mining operations after treatment. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the first drilling exploration borehole in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the second drilling exploration borehole in an embodiment of the present invention; Figure 3 This is a schematic diagram of the distribution structure of the borehole locations for the second drilling exploration operation in an embodiment of the present invention; Figure 4 This is a schematic diagram of the grouting structure for a fixed target area in an embodiment of the present invention; Figure 5 This is one of the structural schematic diagrams of the borehole high-pressure balloon grout stopper device assisted in fixed-point target area grouting in an embodiment of the present invention; Figure 6 This is the second schematic diagram of the structure of the borehole high-pressure balloon grout stopper device assisted in fixed-point target area grouting in an embodiment of the present invention; Figure 7 This is a schematic diagram of the grouting construction of the fixed target area in an embodiment of the present invention; Figure 8 This is a schematic diagram of the high-pressure ball bearing grout stopper system for drilling, as described in an embodiment of the present invention. Figure 9 This is a schematic diagram of the opening positions of Z3-Z9 in an embodiment of the present invention.

[0026] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0029] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0030] Example 1 like Figure 1-8 As shown, a method for precise grouting reinforcement of fault-bounded structural zones includes the following steps: (1) Fault exploration: Fault exploration methods include three-dimensional seismic exploration and drilling exploration. By using precise fault exploration methods such as three-dimensional seismic exploration and drilling exploration, grouting boreholes are constructed to a predetermined depth to ensure that the borehole terminal penetrates the fault fracture zone and the "target area" is clearly defined.

[0031] (2) Precise drilling and target positioning: Based on fault exploration data, grouting boreholes are drilled to a predetermined depth to ensure that the borehole terminal penetrates the fault fracture zone and to determine the target area corresponding to the fault fracture zone. (3) Lowering and sealing the stop plug: The drilling high-pressure balloon grout-stopping system is used for construction. This system includes a drilling high-pressure balloon grout-stopping device, which comprises a hollow tube and a high-pressure balloon body (made of high-toughness rubber material, with both ends sealed to the outer wall of the hollow tube in conventional methods) fixedly connected to the outer wall of the hollow tube. It also includes a borehole pressurization control unit (which precisely controls the expansion and contraction of the high-pressure balloon to ensure sealing and equipment recovery). The borehole pressurization control unit includes a pressurization pump connected to a high-pressure hose, which is connected to the high-pressure balloon body.

[0032] Specifically, the orifice pressurization control unit also includes a pressure gauge for monitoring water pressure and a pressure relief valve.

[0033] Specifically, similar to existing methods, pressure is monitored using a pressure gauge and pressure relief valves are used to relieve pressure.

[0034] During construction, the sealing pressure of the high-pressure balloon after expansion should be controlled to be no less than 1.2 times the final grouting pressure. After grouting is completed, the high-pressure balloon can release water and relieve pressure.

[0035] A connector for connecting the drill rod is installed at the liquid inlet end of the hollow tube. During construction, the drill rod is connected to the hollow tube.

[0036] During construction, the high-pressure balloon grouting plug device is connected to the drill rod and lowered to the predetermined setting position. The setting position is located in the intact rock layer on the upper plate of the fault plane, 10m away from the fracture zone. High-pressure liquid is injected into the high-pressure balloon through the borehole control unit, causing the high-pressure balloon to expand radially and fit tightly against the borehole wall, forming a high-pressure sealed grouting chamber, thus achieving physical isolation between the target area and the non-target area.

[0037] The grouting end of the drill rod is installed on the grouting pump via a high-pressure grouting hose, and grout is injected through the grouting pump.

[0038] (4) Targeted grouting operation: Pump grouting material into the target area through the central grouting channel of the grout stop plug. The grouting pressure is steadily increased to the design final pressure of 10-10.5MPa and maintained in a stable state until the grout fully penetrates. The grouting material is K1 type inorganic grouting material for mining, with an initial setting time of 15-20 minutes.

[0039] Specifically, in the selection of grouting materials, by comparing the performance of single-component cement grout, K4 type inorganic quick-setting material, and K1 type mining inorganic grouting material, K1 type material was determined to be the suitable material. This material has an initial setting time of approximately 30 minutes, balancing good flowability and pumpability, moderate curing speed, and high final consolidation strength. This ensures sufficient penetration and diffusion of the grout within the target area, facilitates safe recovery of the grout plug, and effectively bonds broken rock blocks after curing.

[0040] (5) Pipeline cleaning and equipment recovery: After the final pressure of grouting is reached, pump clean water to flush the drill rod and the internal channel of the grout stop plug for 1-2 minutes; after the grouting material has initially set, release the pressure inside the high-pressure balloon to cause the high-pressure balloon to contract, and use the drilling machine to recover the entire high-pressure balloon grout stop plug device from the hole.

[0041] Example 2 like Figure 1-9 As shown, this embodiment further discloses a specific implementation method based on embodiment 1, as follows: ① Precise drilling and target area positioning: Based on the drilling exploration data below, six grouting boreholes (Z3, Z4, Z5, Z6, Z8, Z9) were designed and constructed in the working face ventilation roadway. The drilling depth was determined based on fault exploration to ensure that the end of all boreholes penetrated the fault fracture zone and to clarify the target area range corresponding to each borehole.

[0042] ② Lowering and Sealing the Grout Stopper: Connect the high-pressure balloon grout stopper device to the drill rod (hollow tube) and lower it to the predetermined sealing position in each borehole (within the intact rock strata on the hanging wall of the fault plane, 10m away from the fracture zone). Inject clean water into the high-pressure balloon using the electric pressure pump at the borehole opening to pressurize it, causing the high-pressure balloon to expand and fit tightly against the borehole wall. Pressure testing confirms a reliable seal.

[0043] ③ Targeted grouting operation: K1 type mining inorganic grouting material is pumped into each target area through the central drill pipe, controlling the grouting pressure to steadily increase to the design final pressure (10.0MPa for Z3 and Z4, and 10.5MPa for Z5, Z6, Z8, and Z9), and maintaining a stable pressure until the grout fully penetrates. The grouting volume for each borehole is as follows: Z3 (54 bags), Z4 (34 bags), Z5 (120 bags), Z6 (51 bags), Z8 (24 bags), and Z9 (20 bags), for a total of 303 bags (7.58t). The specific construction locations for Z3-Z9 are as follows. Figure 9 As shown.

[0044] ④ Pipeline cleaning and equipment recovery: After each borehole reaches the final grouting pressure, pump clean water to flush the drill rod and the internal channels of the grout stop plug for 1.5 minutes. After waiting 30 minutes for the grout to initially set, open the pressure relief valve to release the pressure of the high-pressure balloon. After the high-pressure balloon contracts, the entire grout stop plug device is recovered by the drilling rig.

[0045] Example 3 like Figure 1-8 As shown in the table below, the specific implementation process of this embodiment compares the effects of the target-domain grouting method with the traditional process.

[0046] Example 4 like Figure 1-8 As shown, this embodiment specifically discloses a method for two drilling explorations. Specifically, the exploration of the fault mainly includes three-dimensional seismic exploration. The specific exploration method of three-dimensional seismic exploration is a conventional method disclosed in the prior art, such as by examining seismic exploration records and actual seismic exploration.

[0047] In addition, two drilling explorations were conducted. After the two drilling explorations, it was decided to design and construct six grouting boreholes in the working face ventilation tunnel to precisely treat the fault.

[0048] The first drilling exploration operation involved drilling several boreholes at azimuth 334° and azimuth 311°, with the borehole inclination angle controlled within the range of 7-12°. The second drilling exploration operation involved drilling several boreholes at azimuth 156° and azimuth 120°, with the borehole inclination controlled within the range of -10° to 8°. The geological structure was explored during both the first and second drilling exploration operations.

[0049] Example 5 like Figure 1-8 As shown, this embodiment, based on embodiment 4, specifically discloses the specific exploration parameters for the first drilling exploration operation (two exploration faults).

[0050] The first drilling exploration operation involved drilling three boreholes at an azimuth of 334°, namely T1-1, T1-2, and T1-3; and drilling three boreholes at an azimuth of 311°, namely boreholes T2-1, T2-2, and T2-3.

[0051] The specific parameters are as follows: the oblique angles of T1-1, T1-2 and T1-3 are 12°, 7° and 7° respectively; the oblique angles of T2-1, T2-2 and T2-3 are 13°, 8° and 10° respectively.

[0052] The drilling lengths of T1-1, T1-2 and T1-3 are 123m, 114m and 130m respectively; the drilling lengths of T2-1, T2-2 and T2-3 are 133m, 111m and 123m respectively.

[0053] During drilling operations at holes T1-1, T1-2, and T1-3, the following was discovered: In T1-1, the following layers were found: 0-2m is a coal seam, 2-20m is a mudstone layer, 20-78m is a coal seam, and 78-123m is a mudstone layer; In T1-2, the following layers were found: 0-2m is a coal seam, 2-46m is a mudstone layer, 46-68m is a coal seam, and 68-114m is a mudstone layer. In T1-3, the following layers were found: 0-6m is a coal seam, 6-50m is a mudstone layer, 50-77m is a coal seam, and 77-130m is a mudstone layer.

[0054] In T2-1, the following layers were found: 0-41m is a coal seam, 41-53m is a mudstone layer, 53-103m is a coal seam, and 103-133m is a mudstone layer. Exploration in T2-2 revealed the following layers: 0-2m coal seam, 2-3m mudstone layer, 3-36m coal seam, 36-103m mudstone layer, and 103-111m coal seam. In T2-3, the following layers were found: 0-20m is a coal seam, 20-81m is a mudstone layer, 81-97m is a coal seam, 97-105m is a mudstone layer, and 105-123m is a mudstone layer.

[0055] The drilling lengths of Z1-1, Z1-2 and Z1-3 are 60m, 60m and 75m respectively; the drilling lengths of Z2-1, Z2-2 and Z2-3 are 73m, 70m and 82m respectively.

[0056] Using the above exploration methods, an underground reverse fault (marked as DF131) with an inclination angle of 135°, a fault dip angle of 30°, and a height difference of 6m and 8m (the height differences between the hanging wall and footwall of the faults explored at 334° and 311° are 6m and 8m respectively, and 135° is the direction corresponding to a 135° clockwise rotation from due north as 0°, representing the overall direction of the fault's extension on the horizontal plane; 30° represents the angle between the fault plane and the horizontal plane) was effectively explored.

[0057] Example 6 like Figure 1-8 As shown, this embodiment, based on embodiment 5, specifically discloses the specific exploration parameters for the second drilling exploration operation (two exploration faults).

[0058] The second drilling exploration operation involved drilling three holes at an azimuth of 156°, namely holes Z1-1, Z1-2, and Z1-3; and drilling three holes at an azimuth of 120°, namely holes Z2-1, Z2-2, and Z2-3.

[0059] The oblique angles of Z1-1, Z1-2, and Z1-3 are +6°, -13°, and 0°, respectively; the oblique angles of Z2-1, Z2-2, and Z2-3 are +8°, ​​+1°, and -10°, respectively.

[0060] The positive and negative values ​​of the above-mentioned oblique angles are based on the horizontal plane of the fault. An upward tilt of the horizontal plane is a positive angle, and a downward tilt is a negative angle.

[0061] In Z1-1, it was found that the 0-5m section is a coal seam and the 5-60m section is a mudstone layer. In Z1-2, it was found that the 0-57m section is a coal seam and the 57-46m section is a mudstone layer. In Z1-3, the following layers were found: 0-8m is a coal seam, 8-44m is a mudstone layer, 44-57m is a coal seam, and 57-75m is a mudstone layer.

[0062] In Z2-1, the following layers were found: 0-2.8m coal seam, 2.8-42.5m mudstone layer, 42.5-42.8m coal seam, and 42.8-53m mudstone layer; Exploration in Z2-2 revealed the following: 0-6m is a coal seam, 6-50m is a mudstone layer, 50-54m is a coal seam, and 54-70m is a mudstone layer; In Z2-3, it was found that the 0-72m section is a coal seam and the 72-82m section is a mudstone layer.

[0063] The above-mentioned drilling exploration method can be used to explore the development of underground reverse faults in a more efficient and accurate way, providing preliminary preparation for precise grouting repair.

[0064] The above exploration methods enabled the effective exploration of faults with dip angles of 48° and 42° and a height difference of 10m.

[0065] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A method for precise grouting reinforcement of fault-bounded structural zones using a fixed-point target area, characterized in that, Includes the following steps: (1) Fault exploration: (2) Precise drilling and target positioning: Based on fault exploration data, grouting boreholes are drilled to a predetermined depth to ensure that the borehole terminal penetrates the fault fracture zone and to determine the target area corresponding to the fault fracture zone. (3) Lowering and sealing the stop plug: Construction is carried out using a borehole high-pressure balloon grout stop system, which includes a borehole high-pressure balloon grout stop device, which includes a hollow tube and a high-pressure balloon body fixedly connected to the outer wall of the hollow tube; it also includes a borehole pressure control unit; the borehole pressure control unit includes a pressure pump, which is connected to a high-pressure hose, and the high-pressure hose is connected to the high-pressure balloon body; Connect the high-pressure balloon grout stopper device to the drill rod and lower it to the predetermined setting position. The setting position is located in the intact rock layer on the upper plate of the fault plane, 10m away from the fracture zone. High-pressure liquid is injected into the high-pressure balloon through the borehole control unit, so that the high-pressure balloon expands radially and fits tightly against the borehole wall to form a high-pressure sealed grouting chamber, thereby achieving physical isolation between the target area and the non-target area. (4) Targeted grouting operation: Pump grouting material into the target area through the central grouting channel of the grout stop plug. The grouting pressure is steadily increased to the design final pressure of 10-10.5MPa and maintained in a stable state until the grout fully penetrates. The grouting material is K1 type mining inorganic grouting material, and its initial setting time is 15-20 minutes. (5) Pipeline cleaning and equipment recovery: After the final pressure of grouting is reached, pump clean water to flush the drill rod and the internal channel of the grout stop plug for 1-2 minutes; after the grouting material has initially set, release the pressure inside the high-pressure balloon to cause the high-pressure balloon to contract, and use the drilling machine to recover the entire high-pressure balloon grout stop plug device from the hole.

2. The method for precise grouting reinforcement of fault-bounded structural zones using targeted grouting according to claim 2, characterized in that, The orifice pressurization control unit also includes a pressure gauge for monitoring water pressure and a pressure relief valve.

3. The method for precise grouting reinforcement of fault-bounded structural zones using a fixed-point target area, as described in claim 1, is characterized in that... The hollow tube is equipped with a connector for connecting to the drill rod at the liquid inlet end.

4. The method for precise grouting reinforcement of fault-bounded structural zones using a fixed-point target area, as described in claim 1, is characterized in that... The high-pressure liquid is water.

5. The method for precise grouting reinforcement of fault-bounded structural zones using a fixed-point target area, as described in claim 1, is characterized in that... The sealing pressure of the high-pressure balloon after expansion is not less than 1.2 times the final grouting pressure, and the high-pressure balloon can release water and relieve pressure after grouting.

6. The method for precise grouting reinforcement of fault-bounded structural zones using a fixed-point target area, as described in claim 1, is characterized in that... The methods for fault detection include three-dimensional seismic exploration and drilling exploration; The drilling exploration includes a first drilling exploration and a second drilling exploration. The first drilling exploration involves drilling three holes at an azimuth of 334°, namely T1-1, T1-2 and T1-3. Three boreholes were drilled at an azimuth of 311°, namely boreholes T2-1, T2-2 and T2-3.

7. The method for precise grouting reinforcement of fault-bounded structural zones according to claim 6, characterized in that, The oblique angles of T1-1, T1-2 and T1-3 are 12°, 7° and 7° respectively; The oblique angles of T2-1, T2-2, and T2-3 are 13°, 8°, and 10°, respectively.

8. The method for precise grouting reinforcement of fault-bounded structural zones according to claim 7, characterized in that, The second drilling exploration operation involved drilling three holes at an azimuth of 156°, namely holes Z1-1, Z1-2 and Z1-3. Three boreholes were drilled at an azimuth of 120°, namely boreholes Z2-1, Z2-2 and Z2-3.

9. The method for precise grouting reinforcement of fault-bounded structural zones according to claim 8, characterized in that, The oblique angles of Z1-1, Z1-2 and Z1-3 are +6°, -13° and 0°, respectively; The oblique angles of Z2-1, Z2-2 and Z2-3 are +8°, ​​+1° and -10°, respectively.

10. The method for precise grouting reinforcement of fault-bounded structural zones according to claim 9, characterized in that, The drilling lengths of T1-1, T1-2 and T1-3 are 123m, 114m and 130m, respectively; The drilling lengths of T2-1, T2-2, and T2-3 are 133m, 111m, and 123m, respectively; the drilling lengths of Z1-1, Z1-2, and Z1-3 are 60m, 60m, and 75m, respectively. The drilling lengths of Z2-1, Z2-2 and Z2-3 are 73m, 70m and 82m, respectively.

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