Continuous mining and continuous filling gangue grouting filling method

Abstract

The invention discloses a continuous mining and continuous filling gangue grouting filling method which comprises the following steps: tunneling a branch roadway between an air inlet roadway and an air return roadway in a working face, and arranging a grouting pipe at the top of the branch roadway; a monitoring system is installed in the branch roadway; an opening in the first end of the branch roadway to be filled is closed, gangue is gradually filled into the branch roadway from the first end of the branch roadway to the second end of the branch roadway, and a cementing material is synchronously sprayed in the filling process of the gangue from bottom to top; after the gangue is filled to the second end of the branch roadway, an opening of the second end of the branch roadway is blocked, and high-pressure grouting is conducted in the branch roadway through the grouting pipe so that the whole space in the branch roadway can be filled; and after grouting is completed for a set time, the stress of the filling body in the branch roadway and the sinking condition of the top of the branch roadway are monitored through a monitoring system. The continuous mining and continuous filling gangue grouting filling method provided by the invention has the advantages that the filling body formed in the branch roadway is high in strength and high in supporting stability.

Description

Technical Field

[0001] The invention relates to the technical field of coal mining, and in particular to a continuous mining and filling gangue grouting filling method. Background Art

[0002] Short-wall continuous mining technology has the advantages of flexibility, strong adaptability, low investment and quick results. It has effectively realized the effective recovery of various coal pillar resources in mines with remarkable results. The combination of continuous mining technology and filling technology has given birth to continuous mining and filling technology, which solves the problems of coal resource recovery and solid waste resource disposal. It has been widely used in many important mining areas and many mines, recovering a large amount of coal resources with obvious technical and economic benefits.

[0003] According to the filling materials, continuous mining and continuous filling can be divided into solid filling, paste filling and gangue grouting filling. The paste filling system has a large investment and high cost, which restricts the application and development of this technology. Although solid filling has the advantages of low investment and low cost, it has disadvantages such as low coal resource recovery rate and poor filling effect, and its application scope is gradually narrowing. Gangue grouting filling is prone to poor internal air discharge, resulting in the inability of grouting to fill all the gaps between the gangue, making the filling body formed by the gangue and grouting low in strength and poor in support stability. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention proposes a continuous mining and continuous filling gangue grouting filling method, which has the advantages of high strength and high support stability of the filling body formed in the branch tunnel.

[0006] The continuous mining and continuous filling gangue grouting filling method of the embodiment of the present invention comprises the following steps:

[0007] A branch tunnel is excavated between the air intake tunnel and the return air tunnel in the working face, and a grouting pipe is set at the top of the branch tunnel;

[0008] Install monitoring systems in branch lanes;

[0009] The first end opening of the branch tunnel to be filled is closed, and gangue is gradually filled into the branch tunnel from the first end to the second end of the branch tunnel, and the cementitious material is sprayed synchronously during the process of filling the gangue from bottom to top;

[0010] After the gangue is filled to the second end of the branch tunnel, the second end opening of the branch tunnel is blocked, and high-pressure grouting is performed into the branch tunnel through the grouting pipe to fill the entire space in the branch tunnel;

[0011] After the set time of grouting completion, the stress of the filling body inside the branch tunnel and the subsidence of the top of the branch tunnel are monitored through the monitoring system.

[0012] According to the continuous mining and continuous filling gangue grouting filling method of the embodiment of the present invention, during the process of gradually filling the gangue into the branch tunnel, the cementitious material will be sprayed synchronously, and the cementitious material at this time can fill the tiny gaps between the gangue. When the gangue completely fills the branch tunnel, the grouting pipe located at the top of the branch tunnel injects the cementitious material into the tunnel. Under the action of high pressure, the cementitious material can fill the larger gaps between the gangue, as well as the gaps between the gangue and the inner wall of the branch tunnel, without the need to pass through a longer path to reach the gaps between the gangue near the bottom of the tunnel as in the related art, thereby avoiding the risk of not being able to reach the gaps between the gangue near the bottom of the tunnel due to insufficient grouting pressure of the grouting pipe. As a result, the filling body finally formed in the branch tunnel has a higher structural compactness, and thus higher strength and stronger support. In addition, compared with solid filling and paste filling, the method of gangue grouting filling also has the advantage of low investment cost.

[0013] In some embodiments, the grouting pipe extends from the first end of the branch tunnel to the second end of the branch tunnel, and the grouting pipe is provided with a plurality of groups of grouting holes arranged at intervals along the extension direction of the branch tunnel. The first end of the grouting pipe is connected to a mobile grouting machine.

[0014] In some embodiments, a plurality of switch valves are connected in series to the grouting pipe, and the plurality of switch valves are arranged at intervals along the extension direction of the grouting pipe.

[0015] In some embodiments, the method of closing the first end opening of the branch tunnel to be filled, gradually filling the branch tunnel with gangue from the first end toward the second end, and simultaneously spraying the cementitious material in the process of filling the gangue from bottom to top, further includes:

[0016] The cementitious material is sprayed synchronously through the grouting pipe when filling the gangue, and / or the cementitious material is sprayed synchronously through the grouting mechanism when the scraper or the gangue thrower fills the gangue into the tunnel.

[0017] In some embodiments, a flow meter is provided at the first end of the grouting pipe, and a pressure sensor is connected in series between the grouting pipe and the mobile grouting machine.

[0018] In some embodiments, the mobile grouting machine is located in the return air lane, and the air inlet lane is provided with one of a scraper conveyor, a shuttle car and a transfer crusher for transporting gangue.

[0019] In some embodiments, the monitoring system includes a stress sensor installed on the bottom plate of the tunnel and a displacement sensor installed in the center of the tunnel, and the displacement sensor extends from the bottom wall of the tunnel to the top wall of the tunnel.

[0020] In some embodiments, a plurality of branch tunnels are excavated between the air intake tunnel and the return air tunnel, and the plurality of branch tunnels are arranged at intervals along the extension direction of the air intake tunnel. The ratio of the width of the isolation supporting coal pillar formed between any two adjacent branch tunnels to the width of the branch tunnel is 0.1-0.3.

[0021] In some embodiments, the plurality of branch tunnels are excavated sequentially by mining one every other tunnel, mining one every other tunnel, or mining one every other three tunnels.

[0022] In some embodiments, the cementitious material includes cement slurry, cement fly ash slurry, gangue cement slurry or high water material slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the distribution of components on a working surface according to an embodiment of the present invention.

[0024] Figure 2 Schematic diagram of the distribution of components in a branch lane according to an embodiment of the present invention.

[0025] Figure 3 It is a schematic diagram of a branch tunnel filled with part of gangue according to an embodiment of the present invention.

[0026] Figure 4 Schematic diagram of a branch tunnel fully filled with gangue according to an embodiment of the present invention.

[0027] Figure 5 It is a schematic diagram after grouting is completed in a branch tunnel according to an embodiment of the present invention.

[0028] Figure 6 Schematic diagram of branch tunnel arrangement on a working face according to an embodiment of the present invention.

[0029] Figure 7 Schematic diagram of another branch lane layout of a working face according to an embodiment of the present invention.

[0030] Reference numerals:

[0031] 1. Air intake tunnel; 2. Return air tunnel; 3. Branch tunnel; 4. Gangue; 5. Cementitious material; 6. Grouting pipe; 7. Stress sensor; 8. Displacement sensor; 9. Pressure sensor; 10. Switch valve; 11. Mobile grouting machine; 12. Scraper conveyor; 13. First retaining wall; 14. Second retaining wall; 15. Isolation support coal pillar; 16. Flow meter. DETAILED DESCRIPTION

[0032] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0033] Combine the following Figure 1-Figure 7 The continuous mining and filling gangue grouting filling method according to an embodiment of the present invention is described.

[0034] The continuous mining and continuous filling method of gangue 4 according to the embodiment of the present invention comprises the following steps:

[0035] A branch tunnel 3 is excavated between the air inlet tunnel 1 and the return air tunnel 2 in the working face, and a grouting pipe 6 is arranged on the top of the branch tunnel 3;

[0036] Install a monitoring system in branch lane 3;

[0037] The first end opening of the branch tunnel 3 to be filled is closed, and gangue 4 is gradually filled into the branch tunnel 3 from the first end to the second end of the branch tunnel 3, and the cementitious material 5 is sprayed synchronously during the process of filling the gangue 4 from bottom to top;

[0038] After the gangue 4 is filled to the second end of the branch tunnel 3, the second end opening of the branch tunnel 3 is blocked, and high-pressure grouting is performed into the branch tunnel 3 through the grouting pipe 6 to fill the entire space in the branch tunnel 3;

[0039] After the grouting is completed for a set time, the stress of the filling body inside the branch tunnel 3 and the subsidence of the top of the branch tunnel 3 are monitored by the monitoring system.

[0040] According to the continuous mining and continuous filling method of gangue 4 grouting and filling of the embodiment of the present invention, in the process of gradually filling the gangue 4 into the branch tunnel 3, the cementitious material 5 will be sprayed synchronously, and the cementitious material 5 at this time can fill the tiny gaps between the gangue 4. When the gangue 4 completely fills the branch tunnel 3, the grouting pipe 6 located at the top of the branch tunnel 3 injects the cementitious material 5 into the tunnel. Under the action of high pressure, the cementitious material 5 can fill the larger gaps between the gangue 4, as well as the gaps between the gangue 4 and the inner wall of the branch tunnel 3, without the need to pass through a longer path to reach the gaps between the gangue 4 near the bottom of the tunnel as in the related art, thereby avoiding the risk of not being able to reach the gaps between the gangue 4 near the bottom of the tunnel due to insufficient grouting pressure of the grouting pipe 6, so that the filling body finally formed in the branch tunnel 3 has a higher structural compactness, and thus a higher strength and stronger support. In addition, the method of grouting and filling with gangue 4 has the advantage of low investment cost compared with solid filling and paste filling.

[0041] It should be noted that after grouting is completed through the grouting pipe 6, the grouting pipe 6 and the monitoring system are permanently retained in the branch tunnel 3. After the cementitious material 5 is cooled, the monitoring system is used to monitor the stress changes of the formed filling body and the sinking of the roof of the branch tunnel 3 to judge the supporting effect of the filling body, so as to facilitate subsequent corresponding debugging and improvement, or serve as an early warning to ensure the safety of subsequent coal mining.

[0042] In some embodiments, the grouting pipe 6 extends from the first end of the branch tunnel 3 to the second end of the branch tunnel 3 , and is provided with a plurality of groups of grouting holes arranged at intervals along the extension direction of the branch tunnel 3 , and the first end of the grouting pipe 6 is connected to a mobile grouting machine 11 .

[0043] That is, the grouting pipe 6 injects the cementitious material 5 into the branch tunnel 3 through multiple groups of slurry outlet holes, ensuring that the cementitious material 5 is more evenly injected into the gaps between the gangue 4 located in different areas of the branch tunnel 3. The setting of the mobile grouting machine 11 can provide high-pressure cementitious material 5 for the grouting pipe 6, and the adjustment of the position in the return air tunnel 2 is flexible and convenient, which can better realize the grouting operation in the grouting pipe 6 in different branch tunnels 3.

[0044] Specifically, a grouting pipe 6 is provided in each branch tunnel 3, and the grouting pipe 6 is located at the center of the top plate of the branch tunnel 3 in the width direction of the branch tunnel 3. Each group of grouting holes may include a plurality of grouting holes arranged at intervals along the circumference of the grouting pipe 6, and the plurality of groups of grouting holes are arranged at equal intervals along the extension direction of the grouting pipe 6.

[0045] In some embodiments, a plurality of switch valves 10 are connected in series to the grouting pipe 6 , and the plurality of switch valves 10 are arranged at intervals along the extension direction of the grouting pipe 6 .

[0046] At this time, when the gangue 4 is gradually filled into the branch tunnel 3, the switch valve 10 on the grouting pipe 6 can be gradually opened, so that the grouting pipe 6 can spray the cementitious material 5 on the gangue 4 being filled, and will not spray it in the area of ​​the branch tunnel 3 that is not filled with gangue 4. This setting effectively avoids the need to arrange a new grouting mechanism when filling the gangue 4, and effectively reduces the grouting cost.

[0047] Specifically, the switch valves 10 are preferably all manual mechanical valves, and the staff can manually open the switch valves 10 in sequence according to the filling progress of the gangue 4.

[0048] It should be noted that when the grouting pipe 6 sprays the cementitious material 5 during the filling process of the gangue 4, its spraying pressure can be adjusted to be lower than the injection pressure of the last process, and the concentration of the cementitious material 5 at this time is lower than the concentration of the cementitious material 5 in the last process.

[0049] In some embodiments, the first end opening of the branch tunnel 3 to be filled is closed, and the gangue 4 is gradually filled into the branch tunnel 3 from the first end of the branch tunnel 3 to the second end, and the cementitious material 5 is sprayed synchronously during the filling process of the gangue 4 from bottom to top, which also includes: synchronously spraying the cementitious material 5 when filling the gangue 4 through the grouting pipe 6, and / or, synchronously spraying the cementitious material 5 through the grouting mechanism when a shovel loader or a gangue thrower fills the gangue 4 into the tunnel.

[0050] That is, in addition to spraying the cementitious material 5 synchronously through the grouting pipe 6 when filling the gangue 4, the cementitious material 5 can also be sprayed through the grouting mechanism on the shovel loader or the gangue thrower when filling the gangue 4 into the tunnel. The latter can mix the cementitious material 5 and the gangue 4 more specifically and evenly. The combination of the two can better ensure the filling reliability of the cementitious material 5 in the gaps between the gangue 4.

[0051] In some embodiments, Figure 2 As shown, a flow meter 16 is provided at the first end of the grouting pipe 6 , and a pressure sensor 9 is connected in series between the grouting pipe 6 and the mobile grouting machine 11 .

[0052] The flow meter 16 and the pressure sensor 9 can detect the grouting flow and pressure in the grouting pipe 6 to effectively judge the grouting situation and grouting amount in the branch tunnel 3, and effectively avoid insufficient injection of the cementitious material 5 to affect the supporting strength of the filling body.

[0053] In some embodiments, Figure 1-Figure 5 As shown, the mobile grouting machine 11 is located in the return air tunnel 2, and the air inlet tunnel 1 is provided with a scraper conveyor 12 for transporting gangue 4, a shuttle car and one of a transfer crusher.

[0054] The scraper conveyor 12, the shuttle car and one of the transfer crushers can transport the gangue 4 to the branch tunnel 3 to be filled, so that the gangue thrower in the branch tunnel 3 can quickly fill the gangue 4 in the return air tunnel 2 into the branch tunnel 3, effectively improving the filling efficiency of the gangue 4 in the branch tunnel 3.

[0055] Specifically, Figure 1 As shown, a scraper conveyor 12 extending along the length direction is provided in the air inlet tunnel 1, and the scraper conveyor 12 extends to the main transport tunnel.

[0056] In some embodiments, Figure 2-Figure 5 As shown, the monitoring system includes a stress sensor 7 installed on the bottom plate of the tunnel and a displacement sensor 8 installed in the center of the tunnel. The displacement sensor 8 extends from the bottom wall of the tunnel to the top wall of the tunnel.

[0057] The displacement sensor 8 is arranged at the center of the branch tunnel 3, and the monitoring reliability of the sinking of the roof of the branch tunnel 3 is higher. The stress sensor 7 is installed on the bottom plate of the branch tunnel 3 and is adjacent to the center of the branch tunnel 3. At this time, the stress sensor 7 and the displacement sensor 8 can be electrically connected to the external early warning platform through the communication cable, and the communication cable can be hidden in the bottom plate of the branch tunnel 3.

[0058] In some embodiments, Figure 6 and Figure 7As shown, multiple branch tunnels 3 are excavated between the air intake tunnel 1 and the return air tunnel 2. The multiple branch tunnels 3 are arranged at intervals along the extension direction of the air intake tunnel 1. The ratio of the width of the isolation supporting coal pillar 15 formed between any two adjacent branch tunnels 3 to the width of the branch tunnel 3 is 0.1-0.3.

[0059] That is, considering the strength of the filling body, by leaving an isolation support coal pillar 15 at the working face, the isolation support coal pillar 15 and the filling body jointly ensure the supporting strength of the working face, the probability of subsidence when excavating other branch tunnels 3 is lower, and the coal mining safety is higher.

[0060] In addition, by setting the ratio of the width of the isolation support coal pillar 15 to the width of the branch tunnel 3 to be lower than 0.3, it is effectively avoided that the width of the isolation support coal pillar 15 is too large, thereby causing low utilization rate of coal resources.

[0061] Specifically, the width of the branch tunnel 3 is generally 4m-6m, and the length is generally 20m-100m.

[0062] In some embodiments, multiple branch tunnels 3 are excavated in sequence by mining one every other tunnel, mining one every other tunnel, or mining one every other tunnel.

[0063] This setting effectively ensures the roof stability and coal seam strength reliability during the excavation of branch tunnel 3, and the coal mining safety is higher.

[0064] In some embodiments, the cementitious material 5 includes cement slurry, cement fly ash slurry, gangue 4 cement slurry or high water material slurry. In this case, the cementitious material 5 has a lower cost and can effectively improve the bonding strength between the gangue 4, so that the supporting strength of the filling body formed in the branch tunnel 3 is higher.

[0065] It should be noted that the cementitious material 5 is preferably cement fly ash slurry, and the cement fly ash slurry ratio is designed according to the filling body strength requirement. The filling body strength is achieved by adjusting the solid particle gradation of the gangue 4, the cementitious material ratio, etc. The gangue 4 can be excavation gangue 4, ground gangue 4, field gangue 4, coal washing plant gangue 4, etc., including but not limited to fly ash, gasification slag, etc.

[0066] In addition, the first end and the second end of the branch tunnel 3 are blocked by the first retaining wall 13 and the second retaining wall 14 respectively, and a cloth strip can be used to block the gap between each of the first retaining wall 13 and the second retaining wall 14 and the branch tunnel 3. At this time, the cloth strip can prevent the cementitious material 5 from overflowing from the first end and the second end of the branch tunnel 3 to the outside of the branch tunnel 3, and the gas inside the branch tunnel 3 can also be discharged from the micropores on the cloth strip along with the injection of the cementitious material 5, thereby ensuring the injection reliability of the cementitious material 5. Among them, an exhaust pipe can also be set in the branch tunnel 3 to facilitate the discharge of gas located in the middle section of the branch tunnel 3.

[0067] At the same time, the current continuous mining and continuous filling paste filling cost is about 100-150 yuan / t, the recovery rate can reach about 95%, and the system investment is generally about 150 million yuan; the continuous mining and continuous filling of gangue 4 solid filling cost is about 30-50 yuan / t, the recovery rate is generally about 50%, and the system investment is generally about 50 million yuan. The continuous mining and continuous filling of gangue 4 solid grouting cementing filling cost of this embodiment is about 50-100 yuan / t, the recovery rate can reach 75%-95%, and the system investment is about 75 million yuan, which has comprehensive advantages in coal resource recovery rate, filling cost and system investment.

[0068] The invention is suitable for the recovery of fully-mechanized corner coal, main lanes and protective coal pillars in almost all mining mines, and is especially suitable for resource-depleted mines. It has strong market competitiveness, broad market prospects and excellent economic benefits. It is especially suitable for resource-depleted mines, which can effectively improve the resource recovery rate and extend the service life of the mine.

[0069] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0070] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0071] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0072] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0073] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0074] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A method for continuous mining and filling of waste rock grouting, characterized in that: The following steps are involved: A branch tunnel is excavated between the air intake tunnel and the return air tunnel in the working face, and a grouting pipe is set at the top of the branch tunnel; Install monitoring systems in branch lanes; The first end opening of the branch tunnel to be filled is closed, and gangue is gradually filled into the branch tunnel from the first end to the second end of the branch tunnel, and the cementitious material is sprayed synchronously during the process of filling the gangue from bottom to top; After the gangue is filled to the second end of the branch tunnel, the second end opening of the branch tunnel is blocked, and high-pressure grouting is performed into the branch tunnel through the grouting pipe to fill the entire space in the branch tunnel; After the set time of grouting completion, the stress of the filling body inside the branch tunnel and the subsidence of the top of the branch tunnel are monitored through the monitoring system.

2. The continuous mining and filling gangue grouting filling method according to claim 1 is characterized in that: The grouting pipe extends from the first end of the branch tunnel to the second end of the branch tunnel. The grouting pipe is provided with a plurality of grouting holes arranged at intervals along the extension direction of the branch tunnel. The first end of the grouting pipe is connected to a mobile grouting machine.

3. The continuous mining and filling gangue grouting filling method according to claim 2 is characterized in that: A plurality of switch valves are serially connected to the grouting pipe, and the plurality of switch valves are arranged at intervals along the extending direction of the grouting pipe.

4. The continuous mining and filling gangue grouting filling method according to claim 3 is characterized in that: The method of sealing the first end opening of the branch tunnel to be filled, gradually filling the branch tunnel with gangue from the first end toward the second end, and spraying the cementitious material in the process of filling the gangue from bottom to top, also includes: The cementitious material is sprayed synchronously through the grouting pipe when filling the gangue, and / or the cementitious material is sprayed synchronously through the grouting mechanism when the scraper or the gangue thrower fills the gangue into the tunnel.

5. The continuous mining and filling gangue grouting filling method according to claim 2 is characterized in that: A flow meter is provided at the first end of the grouting pipe, and a pressure sensor is connected in series between the grouting pipe and the mobile grouting machine.

6. The continuous mining and filling gangue grouting filling method according to claim 2, characterized in that: The mobile grouting machine is located in the return air lane, and the air inlet lane is provided with one of a scraper conveyor, a shuttle car and a transfer crusher for transporting gangue.

7. The continuous mining and filling gangue grouting filling method according to claim 1, characterized in that: The monitoring system comprises a stress sensor installed on the bottom plate of the tunnel and a displacement sensor installed at the center of the tunnel, wherein the displacement sensor extends from the bottom wall surface of the tunnel to the top wall surface of the tunnel.

8. The continuous mining and filling gangue grouting method according to any one of claims 1 to 7, characterized in that: A plurality of branch tunnels are excavated between the air intake tunnel and the return air tunnel, and the plurality of branch tunnels are arranged at intervals along the extension direction of the air intake tunnel. The ratio of the width of the isolation support coal pillar formed between any two adjacent branch tunnels to the width of the branch tunnel is 0.1-0.

3.

9. The continuous mining and filling gangue grouting filling method according to claim 1, characterized in that: The plurality of branch tunnels are excavated in sequence by mining one every other tunnel, mining one every other tunnel, or mining one every other three tunnels.

10. The continuous mining and filling gangue grouting method according to claim 1, characterized in that: The cementitious material includes cement slurry, cement fly ash slurry, gangue cement slurry or high water material slurry.

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