Method for preparing concrete through underground space discrete solid waste grouting

Abstract

The invention discloses a method for preparing concrete through underground space bulk solid waste grouting, which comprises the following steps: throwing gangue to a branch roadway filling position by using a gangue throwing machine, injecting cement grout into gangue gaps by using grouting pipelines arranged on a top plate, a bottom plate and two sides in advance, and forming gangue concrete after condensation. According to the method, the uniformity of the grouting slurry of the cement filling body is guaranteed by optimizing the positions and the number of the pipelines on site. According to the gangue throwing and grouting method designed by the invention, the gangue does not need to be crushed, rapid filling can be carried out regardless of the particle size, the pipeline only conveys the slurry and is not easy to block, the possible pipe blocking phenomenon caused by paste pipeline filling is effectively avoided, the major safety risk caused by pipe blocking is prevented, the efficiency is greatly improved, and the cost is greatly saved.

Description

Technical Field

[0001] The invention relates to the field of coal mine filling mining, and more specifically, to a method for preparing concrete by grouting dispersed solid waste in an underground space. Background Art

[0002] In the process of coal mining, gangue filling technology, as one of the filling mining methods, has developed relatively maturely and is widely used in practice. The present invention is aimed at branch tunnel filling mining, and first analyzes the original filling methods. The existing filling methods include: gangue grouting, gangue grouting, etc.

[0003] The gangue grouting method in the branch tunnel has the ability to quickly close gaps, can quickly fill small cracks and joints to prevent them from further expansion, and is easy to operate at low pressure, does not require complex equipment, and makes construction easier. It is highly flexible and very suitable for local repair and sealing work. In addition, this method also helps to improve the surface quality, not only improving the flatness and aesthetics of the tunnel surface, but also providing an additional layer of protection for the surface, ensuring the long-term stability of the structure and the quality of the appearance. At present, the use of the gangue grouting method in the branch tunnel, such as the patent "A gangue filling and pipeline grouting and bonding combined construction process" (patent number: CN113586139A), combines the advantages of the gangue throwing machine and grouting technology, and uses the remote control of the gangue throwing machine to efficiently throw the gangue into the goaf, and uses the pre-laid pipeline to grout and bond the newly filled gangue layer layer by layer. This process realizes the grouting and bonding while throwing away the gangue, ensuring the uniform mixing of the gangue and the grouting material, which not only improves the overall strength, stability and density of the filling body, but also effectively solves the problem of low bonding strength and inadequate top connection of the gangue filling body in the traditional method. However, when using the grouting method, it is impossible to penetrate into the gaps between the gangue, which gradually shows limitations such as low filling efficiency and weak anti-compression deformation ability in terms of reinforcing the surrounding rock and preventing ground subsidence. The present invention is aimed at significantly lengthening the length of the branch lane in the process of filling the branch lane, reducing the frequent door opening and pre-penetration caused by the short branch lane filled with conventional paste, thereby significantly improving the excavation filling efficiency. The gangue throwing grouting method adopted in this method sets four grouting pipelines on the top plate, bottom plate and two sides of the laneway by drilling or other means to meet the specific needs of different areas and flexibly adjust the grouting operation. According to the actual measurement and comprehensive evaluation of the grouting effect of each grouting pipeline, the number of pipelines arranged in the top and bottom plates and the two sides is determined, and the optimized grouting pipeline position is determined. During the grouting process, a certain pressure is applied to inject the slurry into the gaps between the gangue. This method greatly improves the filling efficiency and structural stability, and enhances the compression resistance and deformation resistance of the filling body. Summary of the invention

[0004] The purpose of the present invention is to address the deficiencies of the existing gangue filling technology in the existing underground filling branch tunnel mining and other similar tunnel filling mining, and to provide a method for preparing concrete by grouting of bulk solid waste in underground space based on the existing filling process. Gangue is scattered on the branch tunnel by a gangue thrower, and the laid grouting pipeline is used to grout and reinforce the gaps in the filled gangue, so as to achieve the reinforcement and compaction of the gangue filling body. Four grouting pipelines are respectively set on the top plate, bottom plate and two sides of the tunnel to meet the specific needs of different areas and flexibly adjust the grouting operation. According to the actual measurement and comprehensive evaluation of the grouting effect of each grouting pipeline, the number of pipelines arranged in the top and bottom plates and the two sides is determined, and the optimized grouting pipeline position is determined. By significantly lengthening the length of the branch tunnel, the frequent door opening and pre-penetration caused by the short branch tunnel of conventional paste filling can be reduced, thereby significantly improving the excavation and filling efficiency; this waste rock grouting method does not require crushing of the waste rock, and for traditional particle sizes, it can be quickly filled regardless of the particle size, and is not easily blocked during pipeline transportation, which significantly improves the filling efficiency, avoids possible pipe blockage during paste pipeline filling, prevents major safety risks caused by pipe blockage, greatly improves efficiency, and greatly saves costs.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A method for preparing concrete by grouting bulk solid waste in an underground space includes a waste rock filling process consisting of a retractable belt conveyor and a waste rock machine, a grouting reinforcement system process, a process for simultaneous filling of waste rock and grouting, a grouting pipeline design, a repose angle and grouting position design, and a waste rock cycle step design.

[0007] The construction process steps of waste rock filling grouting reinforcement are as follows:

[0008] [1] Use the remote control function of the dumper to send the dumper to the first dumping area.

[0009] [2] The pipeline is manually laid from the roof to the first filling area in advance, and the pipeline is manually lifted from the ground to the roof, bottom plate and two sides using small cranes and other equipment.

[0010] [3] The gangue is conveyed to the gangue thrower by the retractable belt conveyor. The gangue thrower scatters the gangue and then retreats a step while the grouting device performs grouting operation on the first gangue throwing area.

[0011] [4] After the slurry in the grouting system is pressurized by the grouting pump, it is transported through the grouting pipeline to the grouting pipelines laid on the top plate, the bottom plate, and the two sides, so as to realize grouting of the filling area, especially above the filling body, and fill the gaps between the gangue.

[0012] [5] Each time a filling step is completed, it is necessary to retreat one filling step. By issuing an extension command to the telescopic cylinder of the telescopic belt conveyor, the belt is retracted, and the telescopic belt conveyor retracts one filling step outward. Similarly, the gangue thrower retreats one filling step outward by remote control. At the same time, the grouting pipeline is retreated by removing a section of the pipeline at the outer end. In this way, the entire system can be moved to the next filling position in an orderly manner.

[0013] [6] This is used to fill the next filling area, thereby completing the filling of the entire tunnel.

[0014] The grouting system is mainly divided into three steps in terms of process flow: slurry preparation, pumping and filling: first, the processing and crushing of washed gangue is carried out, and then the crushed gangue particles, fly ash, etc. are transported to the mobile pump station in proportion, and then water is added to prepare the filling slurry using equipment such as a mixer, and the slurry is transported to the goaf for filling using a special filling pump. The filling material is an inorganic material, and the gangue filling slurry is composed of: tiny gangue particles + fly ash + additives (self-developed, non-cemented) + water, or cement + water + additives + aggregates, which have the excellent characteristics of strong fluidity, long-distance transportation, and no segregation or water seepage for a long time.

[0015] The design of the grouting pipeline is to set four grouting pipelines on the tunnel roof, bottom plate and two sides respectively, comprehensively evaluate the grouting effect of each grouting pipeline based on actual measurements, determine the number of pipelines arranged in the top and bottom plates and two sides, and determine the optimized grouting pipeline position.

[0016] As an improved solution of the present invention, the grouting pipeline is composed of segmented grouting pipelines combined by connecting buckles, and the connecting buckles are installed in the grouting pipe area between two pipe transport trolleys. A U-shaped bracket is installed above the bottom plate of the pipe transport trolley, and the grouting pipeline is supported by the U-shaped bracket, and the pipe transport trolley drives the movement of the grouting pipeline.

[0017] As an improved solution of the present invention, after the grouting reinforcement completes a filling area, it is necessary to retreat a filling step. This drives the pipe transport trolley to retreat, so that the grouting pipeline retreats. Before the waste dumper moves outward, a section of the grouting pipe is disassembled, and after the waste dumper moves into place, the remaining grouting pipes are connected. In this way, the gradual grouting reinforcement of the tunnel from the inside to the outside is achieved.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] [1] Manually operated waste rock dumping machines can be used to scatter waste rock in branch tunnels to effectively reduce filling costs.

[0020] [2] Gangue dumping and grouting are carried out simultaneously to fill the gaps in the gangue and mix them evenly. During the grouting and cementing process, the slurry penetrates into the scattered gangue. The high-pressure grouting technology compacts the filling material tightly, thus forming a filling structure that is tightly combined with the top. This method can improve the filling efficiency. In addition, it can quickly provide the necessary support force for the grouting of the branch tunnel, effectively control the deformation of the surrounding rocks, and achieve the purpose of stabilizing the geological environment.

[0021] [3] Compared with other technologies, this process has a longer support area when dumping gangue, which avoids problems such as collapse during the filling process. Through the arrangement of grouting pipes, the two are mixed evenly, avoiding phenomena such as no connection with the top.

[0022] [4] By improving the process, uniform distribution during the grouting process was achieved, ensuring the stability of the filling body quality, enhancing the safety and reliability of the support structure, and thus improving the uniformity of grouting.

[0023] [5] The problem of short length of traditional branch tunnels was optimized, which effectively extended the working surface, reduced the non-productive time caused by frequent switching of working surfaces, and greatly improved the overall efficiency of excavation and filling.

[0024] [6] The use of waste rock dumping technology to replace the traditional pipeline transportation method solves the problem that large-size materials easily cause pipeline blockage. Waste rock dumping has a fast speed and high efficiency, does not require additional material crushing, is adaptable to waste rocks of different particle sizes, and ensures continuous operation.

[0025] [7] Eliminating the material crushing process not only reduces equipment investment and maintenance costs, but also reduces energy consumption and labor costs, essentially simplifying the process and achieving effective cost control. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the structure of the gangue throwing device

[0027] Figure 2 Schematic diagram of the grouting device structure

[0028] Figure 3 Schematic diagram of the structure of a retractable retractable belt conveyor mechanism

[0029] Figure 4 Working diagram of the waste rock throwing machine

[0030] Figure 5 Top view of the grouting and cementing reinforcement for the waste rock filling

[0031] Figure 6 Schematic diagram of the transport vehicle structure

[0032] Figure 7The layout diagram of the gangue dumping device and grouting device in the tunnel

[0033] Figure 8 Schematic diagram of the gangue grouting process

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] A method for grouting and filling waste rock, the method comprising the following steps:

[0036] [1] Arrangement of the waste rock filling system: The waste rock dumper 5 is sent to the branch tunnel filling area 34 by utilizing the remote control function of the waste rock dumper 5; the waste rock dumper 5 is connected to the retractable belt conveyor 1, and the waste rock transportation system 1+5+8+26 is arranged to the designated location by utilizing the movement of the waste rock dumper 5.

[0037] [2] A worker operates a small crane to lift the grouting pipe 4 from the ground to the top plate 3, and extends the end of the pipe into the filling area 34, thereby laying and fixing the grouting pipe 4; thus, the grouting system is laid to the designated location.

[0038] [3] A telescopic belt conveyor 1 is set up outside the tunnel, and the gangue is transported to the gangue thrower 5 by the telescopic belt conveyor 1. The gangue thrower 5 scatters the gangue to fill the filling area 34. Every time a filling step 33 is scattered, the telescopic belt conveyor 1 retracts outwards by a filling step 33, and the gangue thrower 5 also retreats outwards by a filling step 33.

[0039] [4] While the gangue thrower 5 throws the gangue into the next filling area 34, the grouting device 32 immediately performs grouting operation on the previous area where the gangue has been thrown; the slurry in the grouting bin 27 is pressurized by the grouting pump 28 and then passes through the grouting pipe 4 to realize grouting of the filling area 34, especially the upper part of the filling body, layer by layer, to fill the gaps between the gangue and to cement and reinforce the filling body.

[0040] [5] After each filling step is completed, the conveyor 1 needs to retreat by one filling step 33. The telescopic cylinder of the telescopic belt conveyor 1 is given an extension command 10 to cause the belt 26 to retract. The telescopic belt conveyor 1 retracts outward by one filling step 33. Similarly, the gangue thrower 5 retreats outward by one filling step 33 by remote control. At the same time, the grouting pipeline 4 is manually controlled to move outward by one filling step 33 to achieve the retreat of the grouting pipeline.

[0041] [6] This is used to fill the next filling area 34, thereby completing the filling of the entire tunnel.

[0042] Figure 7 It is the layout diagram of the gangue dumping device and the grouting device in the tunnel;

[0043] The gangue throwing device 31 includes a gangue throwing machine 5 and a telescopic belt conveyor 1; the grouting reinforcement system includes a grouting pipeline 4, a pipe transport trolley 30, a connecting buckle 29, a pressure pump 28, and a slurry silo 27. Figure 5 It is a schematic diagram of the structure of a telescopic belt conveyor.

[0044] Figure 1 It is a schematic diagram of the structure of the gangue throwing device;

[0045] Figure 2 is a schematic diagram of the structure of the grouting device;

[0046] In this example, four grouting pipelines 4 are respectively arranged on the top plate, bottom plate and two sides of the tunnel to flexibly adjust the grouting operation according to the specific needs of different areas. By arranging a pipeline connecting buckle 29 on the silo 27, the silo 27 is connected to the grouting pipeline 4 to achieve long-distance grouting.

[0047] In this embodiment, the grouting pipeline 4 is composed of various sections of the grouting pipeline combined through the connecting buckle 29, and the connecting buckle 29 is installed in the grouting pipe area between the two pipe transport carts 30.

[0048] In this embodiment, after grouting is completed in a filling area 34, it is necessary to retreat a filling step 33, thereby driving the transport trolley 30 to retreat, so that the grouting pipeline 4 retreats to the outside of the tunnel, and the terminal transport trolley 30 and the section of grouting pipeline 4 are removed, so that the outlet of the pressure pump 28 is connected to the previous section of the pipeline, thereby realizing gradual grouting of the tunnel from the inside to the outside.

[0049] In this embodiment, after the rock thrower 5 throws a filling area 34, it needs to retreat a filling step 33. By applying an extension command to the telescopic cylinder 10 of the telescopic belt conveyor 1, the belt is retracted. Then, the rock thrower 5 can retreat a filling step 33 and throw rock again.

[0050] Figure 3 It is a structural schematic diagram of a retractable telescopic belt conveying mechanism;

[0051] In this embodiment, the telescopic belt conveyor 1 is equipped with a belt storage telescopic box. The belt storage box is installed on the fixed head frame 9, and the fixed head frame 9 is placed on the crawler walking mechanism 13. Four complete machine telescopic oil cylinders 7 are installed on both sides of the fixed head frame 9, which are respectively located in the middle and bottom sides of the fixed head frame 9, and the bottom is fixed on the fixed head frame 9, and the piston rod is fixed on the tail frame 23. The tail frame 23 is equipped with upper and lower guide rollers 15, and is connected to the bracket 21 through a movable telescopic frame 16. The top of the bracket 21 is equipped with an upper roller 14, the lower roller 18 is arranged at the bottom, and the universal wheel 17 is arranged at the bottom. A set of belt storage devices that can provide guidance and telescopic functions for the belt 19 are arranged inside the belt storage box. The belt 19 enters the belt storage box from a fixed guide roller 15 at the bottom of the belt storage box, and after being guided by multiple movable guide rollers 24, it passes through from the top and is wound on the external electric roller 8. Subsequently, the adhesive tape 19 passes through the upper roller 14, the fixed guide roller 15, and the lower roller 18 in sequence, and finally connects with the adhesive tape 19 at the fixed guide roller 15 at the bottom of the tape storage box. In addition, a hydraulic pump 11 and a motor 12 for providing power are also installed at the bottom of the tape storage box. In this embodiment, the tape storage mechanism includes a slideway 29 arranged on the inner side walls of the tape storage box, a slider 22 is embedded in the slideway 20, one side of the two ends of the slider 22 is respectively embedded in the slideway 20 of the two side walls, and the other side is connected to the movable guide roller 24 through an axis, and the opposite side of the slider 22 where the movable guide roller 24 is arranged is connected to the piston rod of the tape storage telescopic oil cylinder 10, and the tape storage telescopic oil cylinder 10 is fixed on the tape storage box, and a plurality of them are arranged from bottom to top, and the two adjacent tape storage telescopic oil cylinders 10 are arranged in opposite directions, and the movable guide roller 24 is wound with the adhesive tape.

[0052] Figure 6 It is a schematic diagram of the structure of the transport and management trolley;

[0053] A U-shaped support 25 is installed above the bottom plate of the transport trolley, and the grouting pipeline 4 is supported by the U-shaped support. The transport trolley drives the movement of the grouting pipeline 4.

[0054] The present invention innovatively adopts a new type of waste rock grouting filling technology. Through this technology, grouting and bonding operations are carried out simultaneously during the waste rock throwing process; the arrangement of the grouting pipe ensures that the thrown waste rock and the grouting material can be evenly mixed. This uniform mixing not only significantly improves the overall strength and stability of the filling body, but also effectively improves the filling efficiency and density. More importantly, this technology can form timely and effective support in the branch tunnel, thereby achieving the effect of accurately controlling the deformation of the surrounding rock, providing strong technical support for safe and efficient production in mines.

Claims

1. A method for preparing concrete by grouting bulk solid waste in underground space, characterized in that: It includes a waste rock filling process consisting of a retractable belt conveyor and a waste rock throwing machine, and a grouting reinforcement system process.

2. A method for preparing concrete by grouting bulk solid waste in underground space: characterized in that it specifically comprises the following steps: 2.1) Move the waste rock dumper to the required filling position through the manual or remote control operation function of the waste rock dumper; as the waste rock dumper moves, the entire waste rock conveying system is deployed in place and reaches the designated position; the grouting pipeline roof is laid by manually operating a small crane or bracket and other equipment with similar functions to lift the grouting pipeline, use resin, cement-based or other types of anchoring agents in liquid form to inject into the pre-drilled holes, and then fix the grouting pipe. After the anchoring agent solidifies, a strong connection is formed, thereby fixing the grouting pipe to the roof. The first waste rock dumping area is determined by length and grouting diffusion range to ensure that the grouting pipe can be accurately laid to the first waste rock dumping area. 2.2) The gangue is transported to the gangue thrower by the retractable belt conveyor. The gangue thrower first scatters the gangue in the first gangue throwing area, and then retreats a distance to scatter it, and the grouting device performs grouting operation. Before laying the grouting pipeline, a slurry barrier thickness must be left to prevent the cement slurry from flowing to the vicinity of the gangue thrower and affecting the operation of the gangue thrower. The grouting pipe is arranged in the middle of the top plate, the middle of the bottom plate and the middle of the two sides. Drill a reinforcement hole at the corresponding position of the grouting hole, install the screw rod, and tie it with wire to prevent the grouting pipe from being pulled out and injuring people; when installing the grouting pipe, the turning part of the grouting pipe must not be suspended in the air. After the slurry in the grouting system is pressurized by the grouting pump, the grouting is performed on the filling body through the grouting pipeline to fill and bridge the gaps between the gangues and mix them evenly, thereby achieving cementation and reinforcement of the filling body. 2.3) Four grouting pipelines are set up on the top plate, bottom plate and two sides of the tunnel respectively, so as to flexibly adjust the grouting operation according to the specific needs of different areas. Real-time monitoring and recording of various data, comprehensive evaluation of the grouting effect of each grouting pipeline based on actual measurement, determine the number of pipelines arranged in the top plate, bottom plate and two sides, and determine the optimized grouting pipeline location. 2.4) Establish the roof support force equation, combine the filling body strength and the uniformly distributed load of the overburden, derive the mathematical relationship between the maximum roof span, top control distance and filling step, and then calculate the maximum filling step. After each filling step is completed, it is necessary to retreat the same distance to continue the operation. The extension command is executed by controlling the hydraulic cylinder of the telescopic belt conveyor to shorten the filling step accordingly; at the same time, the gangue thrower is automatically moved backward by the same distance through remote control; to ensure that the grouting pipeline synchronously retreats one filling step, ready for the next step of filling work.

3. The method for preparing concrete by grouting dispersed solid waste in underground space according to claim 1, characterized in that: After the first waste rock dumping is completed, step back a certain distance, and at the same time as the second waste rock dumping, grouting is carried out on the area of ​​the first cycle waste rock dumping through the grouting pipe, and the arrangement of the grouting pipe in the tunnel is designed.

4. According to the method for preparing concrete by grouting of bulk solid waste in underground space according to claim 2.1, it is characterized in that: The method of dumping and filling is further improved on the basis of existing filling. The dumping machine is precisely moved and connected to the belt conveyor by manual or remote control operation to form a mobile dumping system; at the same time, the grouting pipe is firmly fixed to the roof by small lifting equipment and anchoring agent, and the first dumping area is determined according to the length of the grouting pipe and the grouting diffusion range to ensure the accurate laying of the grouting pipeline.

5. The method for preparing concrete by grouting dispersed solid waste in underground space according to claim 2.2, characterized in that: The gangue is sent to the gangue thrower through a retractable belt conveyor and is scattered for the first time in the predetermined area. Then the gangue thrower retreats and continues to scatter, while the grouting device simultaneously grouts the scattered area to achieve a seamless connection between scattering and grouting. The grouting pipeline is pre-laid in the center of the top plate, bottom plate and both sides. For safety reasons, the grouting pipe must not be suspended in the air at the bend, and the thickness of the covering concrete must meet the requirements of the on-site assessment. The grouting hole and the pipe are firmly connected and sealed with cotton mesh and cork. At the same time, reinforcement holes and screw rods are set to fix the grouting pipe to prevent accidental extraction. The grouting system uses a grouting pump to pressurize and inject the slurry into the filling body through the grouting pipeline to bridge the gaps between the gangue, thereby reinforcing the filling body and improving its stability and safety.

6. A method for preparing concrete by grouting dispersed solid waste in underground space according to claim 2.3, characterized in that: The grouting pipeline laying: four grouting pipelines are set on the top plate, bottom plate and two sides of the tunnel respectively to meet the specific needs of different areas and flexibly adjust the grouting operation. The rear pipeline is placed along the bottom plate of the tunnel and lifted by the transport vehicle. In the area that needs grouting and filling, a small crane or bracket or other equipment with similar functions is manually operated to lift the grouting pipeline. The grouting pipeline is lifted with the crane and other equipment to grout the front area. According to the actual measurement, the grouting effect of each grouting pipeline is comprehensively evaluated, the number of pipelines arranged in the top and bottom plates and the two sides is determined, and the optimized grouting pipeline position is determined.

7. A method for preparing concrete by grouting dispersed solid waste in underground space according to claim 2.4, characterized in that: By establishing the bearing force equation of the roof and combining the influence of the filling body strength and the uniformly distributed load of the overburden, the mathematical relationship between the maximum span of the roof, the top control distance and the filling step distance is derived to calculate and determine the maximum filling step distance. After completing each scattering operation of a filling step distance, the equipment needs to retreat the same distance to carry out the next cycle of operation. The telescopic belt conveyor controls the storage and release of the belt through the action of the cylinder. When the cylinder is extended, the belt is retracted into the belt storage box; when the cylinder is retracted, the belt is released from the belt storage box. This mechanism allows the belt to flexibly switch between storage and release, thereby realizing dynamic adjustment of the conveyor length, that is, extension or shortening.

8. The method for preparing concrete by grouting dispersed solid waste in underground space according to claim 5, characterized in that: The grouting pipeline is composed of segmented grouting pipelines combined by connecting buckles, and the connecting buckles are installed in the grouting pipe area between two pipe transport trolleys. A U-shaped bracket is installed above the bottom plate of the pipe transport trolley, and the grouting pipeline is supported by the U-shaped bracket, and the pipe transport trolley drives the movement of the grouting pipeline.

9. The method for preparing concrete by grouting dispersed solid waste in underground space according to claim 5, characterized in that: After completing the grouting reinforcement of a filling area, it is necessary to withdraw a filling step. This action will drive the transport trolley to retreat together, and then the grouting pipeline will retract accordingly. Before the dumper is moved outward, a section of the grouting pipe must be disassembled. When the dumper is moved into place, the disassembled grouting pipe is connected to achieve grouting from the inside of the tunnel to the outside.

10. The method for preparing concrete by grouting dispersed solid waste in underground space according to claim 5, characterized in that: The grouting system is mainly divided into three links in terms of process flow: slurry making, pumping and filling: first, the processing and crushing of washed gangue are carried out, and then the crushed gangue particles, fly ash, etc. are transported to the mobile pump station in proportion, and then water is added to prepare the filling slurry using equipment such as a mixer, and the slurry is transported to the goaf for filling using a special filling pump. The filling material is an inorganic material, and the gangue filling slurry is composed of: tiny gangue particles + fly ash + additives (self-developed, non-cemented) + water, or cement + water + additives + aggregates. It has the excellent characteristics of strong fluidity, long-distance transportation, and no segregation or water seepage for a long time.

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