Water-rich soft rock coal mine mining roadway advanced section supporting method

Abstract

The invention provides a water-rich soft rock coal mine mining roadway advanced section supporting method, relates to the field of roadway supporting, and adopts the scheme that the method comprises the following steps: S01, constructing an advanced section anchor cable supporting initial model, performing a simulation test, and optimizing a supporting position and supporting strength; s02, drilling anchor holes with corresponding diameters and depths in corresponding positions of a top plate, a side part and a bottom plate of the roadway according to the supporting position and the supporting strength requirement obtained in the S01; s03, the supporting system is installed on the roadway top plate, the side portion and the bottom plate; and S04, grouting is conducted. According to the method, the supporting system can be accurately established, and the supporting strength is improved.

Description

Technical Field

[0001] The invention relates to the field of tunnel support, and in particular to a method for supporting an advanced section of a mining tunnel in a water-rich soft rock coal mine. Background Art

[0002] The surrounding rock of soft rock tunnels is relatively soft. Under the influence of various factors, there are problems such as roof collapse, large deformation of the two sides and severe bottom heave. At present, anchor cable support is usually carried out on the tunnel to improve the stability of the tunnel.

[0003] In the prior art, coal mine mining tunnels generally use a passive support method of "single hydraulic prop + articulated top beam + iron shoe" to support the roof at the front end of the mining tunnel.

[0004] However, when using the above technical support, on the one hand, the single pillars, hinged top beams, and iron shoes are all steel products with heavy weight, and the transportation and construction consumes a lot of manual labor and occupies a large number of personnel. On the other hand, affected by the special geological environment underground, the soft rock tunnel is very easy to expand and deform after encountering water. The single pillar is affected by the stress and the pillar drills the bottom. The bottom plate is an arc-shaped tunnel reinforced with shotcrete. The stress is concentrated due to the mining. The initial support force of the single pillar is converted into working resistance, the pillar is deformed, the iron shoe is damaged, and the shotcrete layer is broken, breaking the original stress balance state. Water flows into the bottom plate rock layer along the shotcrete cracks, expands and deforms when encountering water, and the convergence of the tunnel increases, which cannot be used normally and cannot meet the normal transportation, ventilation, and pedestrian needs. Tunnel repair work is required, which occupies a large amount of human and material resources and has low construction efficiency. Summary of the invention

[0005] In order to solve the technical problem of poor support strength of soft-edge tunnels in the above-mentioned prior art, the present invention provides a method for supporting the advanced section of mining tunnels in water-rich soft rock coal mines, which can establish a support system more accurately and improve the support strength.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a method for supporting the advanced section of a water-rich soft rock coal mine mining tunnel, comprising the following steps: S01: Construct the initial model of the leading anchor cable support and conduct simulation tests to optimize the support position and support strength of the support system; S02: According to the support position and support strength requirements obtained in S01, anchor holes of corresponding diameter and depth are drilled at corresponding positions of the tunnel roof, side and bottom plates; S03: Install the support system on the roof, side and bottom plates of the tunnel.

[0007] The present invention obtains a support system by establishing a tunnel model and conducting a model test, and can obtain relatively accurate support point positions and support strengths, thereby ensuring that the support point positions and support strengths provided by the support system meet the needs of tunnel mining.

[0008] Furthermore, the support system includes a top plate support assembly, a side support assembly and a bottom plate support assembly, the top plate support assembly and the side support assembly both include the steel wire anchor cable, the support plate and the support net, the support plate is used to adhere to the rock wall, the support net is located on the outside of the support plate and connected to the rock wall, and the bottom plate support assembly includes the support plate and the grouting anchor.

[0009] The present invention uses steel strand anchor cables and grouting anchor cables instead of hydraulic pillars in the prior art for protection. On the one hand, it can greatly reduce the large amount of labor invested in the deployment of the protection system and improve work efficiency. On the other hand, it can also avoid the phenomenon of hydraulic pillars drilling into the bottom when they encounter water in soft rock tunnels.

[0010] Further, the S01 comprises the following steps: S011: Construct the advanced section model of the mining tunnel in soft rock coal mine; S012: Select the initial support position, determine the initial support strength, and construct the leading section anchor cable support model. The leading section anchor cable support model includes the leading section model of the soft rock coal mine mining roadway in S011 and the model of the support system. S013: Conduct tunnel dynamic load simulation test and mining stress field evolution; S014: Adjust the support position, anchor hole depth, anchor hole diameter and amount of anchoring agent according to the deformation of the tunnel, and repeat S013 until the deformation of the leading section anchor cable support model meets the requirements.

[0011] The present invention can more comprehensively simulate the working conditions and load conditions of the tunnel by performing tunnel dynamic load simulation tests and mining stress field evolution on a tunnel model with a support system model, so that the anchor hole positions and anchor hole sizes of the support system can be determined more accurately and reliably.

[0012] Furthermore, in S02, the diameter and depth of the anchor holes at the top plate are greater than the diameter and depth of the anchor holes at the side and the base.

[0013] Further, the S03 comprises the following steps: S031: Clean the rock dust in the hole before installing the support system; S031: Install the roof support assembly. During installation, first use the steel strand anchor cable to push the anchor agent to the bottom of the hole, seal the hole after the anchor agent solidifies, install the support plate and the anchor ball of the steel strand anchor cable, and tension it; S032: Install the side support assembly. During installation, first use the steel strand anchor cable to push the anchor to the bottom of the hole. After the anchor solidifies, install the support plate and the anchor ball of the steel strand anchor cable and tension them. S033: Install the bottom support. During installation, first use the grouting anchor to push the anchor to the bottom of the hole. After the anchor solidifies, install the support plate and the lock of the grouting anchor, and tension it. After tensioning, grouting is performed.

[0014] The present invention strengthens the connection strength between the grouting anchor rod and the steel strand anchor cable and the rock wall by using an anchoring agent, and improves the support strength. By grouting the bottom plate, the grouting material can form a whole with the surrounding soil or rock, thereby enhancing the connection reliability of the grouting anchor rod and enhancing the support strength of the bottom plate.

[0015] Furthermore, the steel strand anchor cables at the top plate use at least four anchors, the steel strand anchor cables at the side plate use at least three anchors, and the grouting anchor cables at the bottom plate use at least three anchors. When the anchor cables are pushed forward, they are stirred while being pushed forward, and stirring is continued for a set time after being pushed forward.

[0016] Furthermore, in the S033, the bottom plate needs to be sealed before grouting. Before sealing, the protruding coal blocks or rocks at the hole mouth are removed to ensure the flatness of the hole mouth surface. When sealing, the anchor hole port is sealed with sealing materials to ensure that the hole wall and the anchor rod of the grouting anchor cable are filled with sealing materials.

[0017] Furthermore, the sealing material is cotton yarn or linen.

[0018] Furthermore, the grouting in S033 includes the following steps: Connect the grouting connector with the grouting pipe to the grouting port of the grouting anchor cable; then grout while stirring until it is full, and use the alternate row grouting mode to avoid grouting between adjacent rows; finally, seal the grouting port on the grouting anchor.

[0019] Furthermore, it also includes S05: the grouting anchor cables of the top plate, the side and the shoulder socket are tied with iron wire for at least two turns, and both ends of the steel wire are tied and connected to the support net and are tied for at least two turns.

[0020] The present invention further improves the connection strength between the steel twist anchor cable and the rock wall by binding with iron wires to prevent falling off.

[0021] It can be seen from the above technical solutions that the present invention has the following advantages: The present invention provides a method for supporting the advanced section of a water-rich soft rock coal mine recovery tunnel. By establishing a tunnel model and conducting a model test to obtain a support system, a relatively accurate support point position and support strength can be obtained, ensuring that the support point position and support strength provided by the support system meet the tunnel mining needs; by using steel strand anchor cables and grouting anchor cables to replace the hydraulic props in the prior art for protection, on the one hand, the large amount of labor invested in the deployment of the protection system can be greatly reduced, and work efficiency can be improved; on the other hand, the phenomenon of the hydraulic props drilling the bottom can be avoided after the hydraulic props encounter water in the soft rock tunnel; by The model's tunnel model is used to conduct tunnel dynamic load simulation tests and mining stress field evolution, which can more comprehensively simulate the working conditions and tunnel load conditions, making the anchor hole position and anchor hole size of the support system more accurately and reliably determined; by using anchoring agents to enhance the connection strength between grouting anchor rods and steel strand anchor rods and rock walls, and improve the support strength, and by grouting the bottom plate, the grouting material can form a whole with the surrounding soil or rock, thereby enhancing the connection reliability of the grouting anchor rods and enhancing the support strength of the bottom plate; by wire binding, the connection strength between the steel strand anchor cable and the rock wall is further improved to prevent it from falling off. DETAILED DESCRIPTION

[0022] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solution of the present invention will be clearly and completely described in combination with the specific embodiment below. Obviously, the embodiment described below is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0023] This specific embodiment provides a method for supporting the advanced section of a water-rich soft rock coal mine mining tunnel, comprising the following steps: The following steps are involved: S01: Construct the initial model of the leading anchor cable support and conduct simulation tests to optimize the support position and support strength of the support system; S02: According to the support position and support strength requirements obtained in S01, anchor holes of corresponding diameter and depth are drilled at corresponding positions of the tunnel roof, side and bottom plates; S03: Install the support system on the roof, side and bottom plates of the tunnel.

[0024] This specific implementation method obtains a support system by establishing a tunnel model and conducting model tests, which can obtain relatively accurate support point locations and support strengths, ensuring that the support point locations and support strengths provided by the support system meet the needs of tunnel mining.

[0025] Due to the different working conditions of the tunnel roof, side and bottom plates, in order to carry out targeted protection while saving materials and improving efficiency, in this specific embodiment, the support system includes a roof support assembly, a side support assembly and a bottom plate support assembly, the roof support assembly and the side support assembly both include the steel strand anchor cable, the support plate and the support net, the support plate is used to adhere to the rock wall, the support net is located on the outside of the support plate and connected to the rock wall, the bottom plate support assembly includes the support plate and the grouting anchor rod; wherein, the grouting anchor rod and the steel strand anchor cable are both existing technologies and will not be repeated in this article.

[0026] In order to ensure that the anchor hole position and size can be more accurately obtained through model analysis to ensure support strength, in this specific implementation, S01 includes the following steps: S011: Construct the advanced section model of the mining tunnel in soft rock coal mine; S012: Select the initial support position, determine the initial support strength, and construct the leading section anchor cable support model. The leading section anchor cable support model includes the leading section model of the soft rock coal mine mining roadway in S011 and the model of the support system. S013: Conduct tunnel dynamic load simulation test and mining stress field evolution; S014: Adjust the support position, anchor hole depth, anchor hole diameter and amount of anchoring agent according to the deformation of the tunnel, and repeat S013 until the deformation of the leading section anchor cable support model meets the requirements.

[0027] By conducting tunnel dynamic load simulation tests and mining stress field evolution on the tunnel model with the support system model in S013, the working conditions and the load conditions of the tunnel can be simulated more comprehensively, so that the anchor hole positions and anchor hole sizes of the support system can be determined more accurately and reliably. In this specific implementation, the software used for model construction and working condition simulation analysis is ANSYS and 3DEC. In the S02, the diameter and depth of the anchor holes at the top plate are greater than the diameter and depth of the anchor holes at the side and the base. Specifically, when the mine pressure on the top plate is not obvious, an anchor cable is constructed facing the working face and located at the center line of the tunnel top plate. A φ21.8×9000mm steel strand anchor cable (19 cores) is used, in conjunction with a 400mm×400mm×12mm anchor cable plate, with a row spacing of 2400mm. If there is a net bag in the top plate reinforcement anchor cable beam, first process the net bag, and then set the anchor cable for support. When the top plate shows an obvious sinking amount greater than 300mm, the working face is 100 meters to the right of the center line of the tunnel top plate. 0mm, and then construct another row of anchor cables. The top plate is reinforced in time for the second time. φ21.8×9000mm steel strand anchor cable (19 cores) is used, with 400mm×400mm×12mm anchor cable disc, and the row spacing is 2400mm; the first row of anchor cables is constructed at the side of the non-working face 1200mm away from the bottom plate. The reinforced anchor cables and the original anchor cables are arranged in a five-flower arrangement. The anchor cables are φ21.6×L6000mm steel strand anchor cables (7 cores) and are constructed with 400mm×400mm×12mm anchor cable discs, with a row spacing of 1800mm; at the bottom plate, facing the working face and located at the center line of the tunnel, a row of Grouting anchor cable, the anchor cable adopts φ21.6×7000mm (1×7 structure) grouting anchor cable, with 2200mm×280mm×5mm steel belt, and the row spacing is 1800mm; when drilling, use MQT-130 / 3.2 pneumatic anchor drilling rig, MQ18-200 / 63 manual anchor cable prestressing tensioning machine for pressurization. Before drilling, first check the support situation of the construction site, find out the dangerous rock and hanging gangue, and ensure that no construction is carried out if it is unsafe; according to the requirements of the anchor hole design position, determine the hole position, and drill vertically on the rock (coal) surface. Use Φ30mm drill bit and Φ28mm drill rod for drilling. The anchor cable is based on The anchor hole design position requirements are as follows: determine the hole position, drill holes vertically on the rock (coal) surface, and the hole depth is 6640-6740mm (7m), 5640-5740mm (6m), 8640-8740mm (9m), and the hole spacing deviation is ±100mm; after drilling, use high-pressure air to blow away the debris in the hole, clean up the accumulated water, the surface of the surrounding rock should be smoothed at the drilling location, and the drilling construction should be carried out in the steel ladder hole. The edge of the fracture surface should not be selected for construction, otherwise the hole mouth cannot be sealed and leakage will occur during grouting. The drilling holes should be perpendicular to the rock surface to prevent the drilling angle from being too large and the anchor cable from bending during tensioning, which will affect the grouting effect.

[0028] The S03 comprises the following steps: S031: Clean the rock dust in the hole before installing the support system; S031: Install the roof support assembly. During installation, first use the steel strand anchor cable to push the anchor agent to the bottom of the hole, seal the hole after the anchor agent solidifies, install the support plate and the anchor ball of the steel strand anchor cable, and tension it; S032: Install the side support assembly. During installation, first use the steel strand anchor cable to push the anchor to the bottom of the hole. After the anchor solidifies, install the support plate and the anchor ball of the steel strand anchor cable and tension them. S033: Install the bottom support. During installation, first use the grouting anchor to push the anchor to the bottom of the hole. After the anchor solidifies, install the support plate and the lock of the grouting anchor, and tension it. After tensioning, grouting is performed.

[0029] This specific embodiment uses anchoring agents to enhance the connection strength between grouting anchor rods and steel strand anchor cables and rock walls, and improves the support strength. By grouting the bottom plate, the grouting material can form a whole with the surrounding soil or rock, thereby enhancing the connection reliability of the grouting anchor rods and enhancing the support strength of the bottom plate.

[0030] In this specific implementation manner, at least four anchors are used for the steel strand anchor cables of the top plate, at least three anchors are used for the steel strand anchor cables at the side parts, and at least three anchors are used for the grouting anchor cables at the bottom plate. When the anchors are pushed forward, they are pushed forward while being stirred, and the stirring is continued for a set time after being pushed forward. Before installing the anchor cables and grouting anchor rods, first check that the surface of the cable body itself is clean to avoid the anchor cables being covered with mud, ash, coal powder, oil and water that affect the bonding effect between the anchor cables and the resin and the grouting liquid. In particular, the slurry outlet position of the grouting anchor rod must not be blocked to keep the slurry outlet unobstructed, and the resin anchoring agent must also be checked. Quality, when pushing the anchor, use the steel strand anchor or grouting anchor to slowly push it to the bottom of the hole, use a stirrer to connect the anchor to the output shaft of the drill, start the drill and push the anchor to the bottom of the hole while stirring. After the specified stirring time, stop the drill and wait for the resin anchor to solidify to complete the anchoring of the anchor. Use the steel strand anchor or grouting anchor to push the resin anchor into the hole. Do not use excessive force to prevent the anchor from breaking prematurely. After the anchor is pushed into the bottom of the hole, use the drill to stir the anchor. Do not use excessive force during the stirring process to prevent breaking the welding joint of the anchor.

[0031] Since the bottom plate needs to be grouted, in order to avoid slurry gushing out, in S033, the bottom plate needs to be sealed before grouting. Before sealing, the protruding coal blocks or rocks at the hole mouth are removed to ensure the flatness of the hole mouth surface. When sealing, the anchor hole port is sealed with sealing materials to ensure that the hole wall and the anchor rod of the grouting anchor cable are filled with sealing materials; the sealing materials are cotton yarn or linen.

[0032] In S033, grouting includes the following steps: Connect the grouting connector with the grouting pipe to the grouting port of the grouting anchor cable; then grout while stirring until it is full, and use the alternate row grouting mode to avoid grouting between adjacent rows; finally, seal the grouting port on the grouting anchor.

[0033] During grouting, screw the grouting connector connected to the grouting pipe into the thread at the end of the grouting anchor cable, slowly tighten the grouting device to ensure that the grouting connector is firmly connected to the anchor cable, and use iron wire to reinforce the protection again to prevent the grouting connector from being stripped due to high pressure during grouting, rebounding and injuring people; during grouting, it is strictly forbidden to stand at the eyes on both sides of the anchor cable, and it is strictly forbidden to stand on both sides of the grouting pipeline. Start the grouting pump for grouting, and the grouting speed should be slow. The grouting valve should not be opened to the maximum at one time; stir while grouting to prevent the slurry from settling. After the grouting is full, the grouting pump can be turned off, and wait for 2 to 3 minutes before grouting again until it is full again. After grouting is completed, the anchor cable grouting port should be promptly plugged with screws, otherwise the slurry will flow out; the mixing barrel, grouting equipment, and grouting pipeline should be installed on one side of the tunnel. When mixing cement slurry, the debris in it must be cleaned up and mixed evenly. Continuous mixing should be carried out during the grouting process to prevent mud sedimentation; during grouting, two people are responsible for adding materials and mixing evenly, while observing the slurry absorption situation. The grouting pump driver observes the grouting machine pressure gauge and handles problems in a timely manner. One person is responsible for observing the grouting hole and the surrounding top wall situation; while grouting, pay attention Observe the grouting pressure. Stop grouting immediately when the pressure reaches 2.0MPa or the grouting pump is stuck. If the anchor cable is fully filled, complete the grouting work of this anchor cable. If it is not fully filled, check the cause, deal with it and wait for 4 to 5 minutes before grouting again. When grouting, pay attention to the leakage around the anchor cable, and use anchor cables or anchoring agents to seal it in time. If the leakage area is too large and cannot be sealed, stop grouting. You can grout other anchor cables first, and then refill the leaking anchor cable after 30 minutes.

[0034] To prevent the anchor cables from falling off, this specific implementation also includes S05, using iron wire to tie the grouting anchor cables of the top plate, the side and the shoulder sockets for at least two turns, and both ends of the steel wire are tied and connected to the support net and are tied for at least two turns.

[0035] From the above specific implementations, it can be seen that the present invention has the following beneficial effects: 1. By establishing a tunnel model and conducting model tests to obtain a support system, we can obtain a relatively accurate support point location and support strength, ensuring that the support point location and support strength provided by the support system meet the needs of tunnel mining; 2. By using steel strand anchor cables and grouting anchor cables instead of hydraulic props in the prior art for protection, on the one hand, it can greatly reduce the large amount of labor invested in the deployment of the protection system and improve work efficiency. On the other hand, it can also avoid the phenomenon of hydraulic props drilling into the bottom when encountering water in soft rock tunnels; 3. Through the tunnel model with support system model, dynamic load simulation test and mining stress field evolution can be carried out to simulate the working conditions and load conditions of the tunnel more comprehensively, so that the anchor hole position and anchor hole size of the support system can be determined more accurately and reliably; 4. By using anchoring agents to enhance the connection strength between grouting anchor rods and steel strand anchor rods and rock walls, and to improve the support strength, and by grouting the bottom plate, the grouting material can be integrated with the surrounding soil or rock, thereby enhancing the connection reliability of the grouting anchor rods and the support strength of the bottom plate; 5. By sealing before grouting, avoid slurry gushing out during grouting; 6. Further improve the connection strength between the steel strand anchor cable and the rock wall by tying with wire to prevent it from falling off.

[0036] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for supporting the advanced section of a water-rich soft rock coal mine mining tunnel, characterized in that: The following steps are involved: S01: Construct the initial model of the leading anchor cable support and conduct simulation tests to optimize the support position and support strength of the support system; S02: According to the support position and support strength requirements obtained in S01, anchor holes of corresponding diameter and depth are drilled at corresponding positions of the tunnel roof, side and bottom plates; S03: Install the support system on the roof, side and bottom plates of the tunnel.

2. The method for supporting the advanced section of the mining tunnel in a water-rich soft rock coal mine according to claim 1, characterized in that: The support system includes a top plate support assembly, a side support assembly and a bottom plate support assembly. The top plate support assembly and the side support assembly both include the steel wire anchor cable, the support plate and the support net. The support plate is used to adhere to the rock wall. The support net is located on the outside of the support plate and connected to the rock wall. The bottom plate support assembly includes the support plate and a grouting anchor rod.

3. The method for supporting the advanced section of the mining tunnel in a water-rich soft rock coal mine according to claim 2, characterized in that: The S01 comprises the following steps: S011: Construct the advanced section model of the mining tunnel in soft rock coal mine; S012: Select the initial support position, determine the initial support strength, and construct the leading section anchor cable support model. The leading section anchor cable support model includes the leading section model of the soft rock coal mine mining roadway in S011 and the support system model. S013: Conduct tunnel dynamic load simulation test and mining stress field evolution; S014: Adjust the support position, anchor hole depth, anchor hole diameter and amount of anchoring agent according to the deformation of the tunnel, and repeat S013 until the deformation of the leading section anchor cable support model meets the requirements.

4. The method for supporting the advanced section of the mining tunnel in a water-rich soft rock coal mine according to claim 3, characterized in that: In S02, the diameter and depth of the anchor holes at the top plate are greater than the diameter and depth of the anchor holes at the side and the base.

5. The method for supporting the advanced section of the mining tunnel in a water-rich soft rock coal mine according to claim 4, characterized in that: The S03 comprises the following steps: S031: Clean the rock dust in the hole before installing the support system; S031: Install the roof support assembly. During installation, first use the steel strand anchor cable to push the anchor agent to the bottom of the hole, seal the hole after the anchor agent solidifies, install the support plate and the anchor ball of the steel strand anchor cable, and tension it; S032: Install the side support assembly. During installation, first use the steel strand anchor cable to push the anchor to the bottom of the hole. After the anchor solidifies, install the support plate and the anchor ball of the steel strand anchor cable and tension them. S033: Install the bottom support. During installation, first use the grouting anchor to push the anchor to the bottom of the hole. After the anchor solidifies, install the support plate and the lock of the grouting anchor, and tension it. After tensioning, grouting is performed.

6. The method for supporting the advanced section of the mining tunnel in a water-rich soft rock coal mine according to claim 5, characterized in that: The steel strand anchor cables at the top plate use at least four anchors, the steel strand anchor cables at the side plate use at least three anchors, and the grouting anchor cables at the bottom plate use at least three anchors. When the anchor cables are pushed in, stir while pushing them in, and continue stirring for a set time after pushing them in.

7. The method for supporting the advanced section of the mining tunnel in a water-rich soft rock coal mine according to claim 5, characterized in that: In the S033, when the bottom plate is difficult to grout, sealing is used instead of grouting. Before sealing, the protruding coal blocks or rocks at the hole mouth are removed to ensure the flatness of the hole mouth surface. When sealing, the anchor hole port is blocked with sealing materials to ensure that the hole wall and the anchor rod of the grouting anchor cable are filled with sealing materials.

8. The method for supporting the advanced section of the mining tunnel in a water-rich soft rock coal mine according to claim 7, characterized in that: The sealing material is cotton yarn or linen.

9. The method for supporting the advanced section of the mining tunnel in a water-rich soft rock coal mine according to claim 8, characterized in that: The S033 grouting comprises the following steps: Connect the grouting connector with the grouting pipe to the grouting port of the grouting anchor cable; then grout while stirring until it is full, and use the alternate row grouting mode to avoid grouting between adjacent rows; finally, seal the grouting port on the grouting anchor.

10. The method for supporting the advanced section of the mining tunnel in a water-rich soft rock coal mine according to claim 9, characterized in that: It also includes S05: the grouting anchor cables of the top plate, the side and the shoulder socket are tied with iron wire for at least two turns, and both ends of the steel wire are tied and connected to the support net and are tied for at least two turns.