Coal gangue-based waste underground back mining roadway chamber filling method

Abstract

The present application provides a kind of coal gangue-based waste underground recovery roadway chamber filling method, comprising: the coal gangue-based waste in recovery roadway is placed in multiple chambers in the recovery roadway;Fill the system is erected in the chamber in the middle position in multiple chambers;Multiple chambers are filled with slurry using the filling system, so that the slurry and the coal gangue-based waste form coagulation filling body.The present application forms coagulation filling body by coagulating waste in recovery roadway with slurry in chamber, improves the support capacity at chamber, and further improves the bearing capacity and stability of narrow coal pillar, reduces the influence of stress concentration degree of goaf suspended roof on recovery roadway and near permanent chamber.

Description

Technical Field

[0001] This invention relates to the field of underground filling technology for goaf areas, and in particular to a method for filling underground mining roadways chambers with coal gangue-based waste. Background Technology

[0002] Narrow coal pillars in the mining roadway chambers are usually unable to withstand the advance support pressure of the mining face. As the working face advances, the risk of rockburst in the narrow coal pillar roadway area will further increase, becoming the main source of danger during the mining period.

[0003] During the excavation of the mining roadway, it is necessary to open pressure relief chambers at regular intervals, such as 40 meters, on the lower side of the upper roadway and the upper and lower side of the lower roadway to alleviate the stress in the coal and rock mass. The opening of pressure relief chambers causes some damage to the narrow coal pillars, and also causes the displacement of the narrow coal pillars in the roadway at the pressure relief chambers to be 1.5 to 2 times that of the solid coal side. As a result, when the adjacent working face is being mined, the narrow coal pillars at the hidden pressure relief chambers in the mining roadway often experience stress concentration due to the pressure of the working face's advance support. This affects the stability of the coal pillars, increases the difficulty of working face mining, and consequently affects mining efficiency. Summary of the Invention

[0004] This invention provides a method for filling underground mining roadway chambers with coal gangue-based waste materials, which solves the problem of insufficient stability caused by stress concentration in narrow coal pillars in the existing technology, and reduces the impact of exposed roof in the goaf on the stress concentration near the pressure relief chamber.

[0005] This invention provides a method for filling underground mining roadway chambers with coal gangue-based waste, comprising: placing coal gangue-based waste from the mining roadway into multiple chambers within the mining roadway;

[0006] The filling system is installed in the middle chamber among the multiple chambers;

[0007] The filling system is used to fill the multiple chambers with slurry, so that the slurry and the coal gangue-based waste form a solidified filling body.

[0008] According to the present invention, a method for filling underground mining roadways with coal gangue-based waste materials, after the step of filling multiple chambers with slurry using the filling system, further includes:

[0009] After the slurry filling of the multiple chambers is completed, the longwall face below the longwall roadway is mined to form a coal pillar of the first width.

[0010] The method for filling underground mining roadway chambers with coal gangue-based waste provided by the present invention further includes:

[0011] Before or simultaneously with filling the multiple chambers with slurry, the mining face below the mining roadway is mined to form a coal pillar of a second width.

[0012] After the slurry filling of the multiple chambers is completed, the coal pillar of the second width is mined back to form the coal pillar of the first width.

[0013] According to the present invention, a method for filling underground mining roadways chambers containing coal gangue-based waste includes the step of using the filling system to fill multiple chambers with slurry, comprising:

[0014] While filling multiple chambers with grout, and simultaneously mining the longwall face, along the longwall face below the longwall roadway...

[0015] The direction of advancement is to use the filling system to fill the multiple chambers with slurry.

[0016] According to the present invention, a method for filling chambers in underground mining roadways for coal gangue-based waste is provided, wherein the plurality of chambers in the mining roadway include a chamber located on the lower side of the mining roadway.

[0017] According to the present invention, a method for filling chambers in underground mining roadways for coal gangue-based waste is provided, wherein the plurality of chambers in the mining roadway also includes a chamber located on the upper side of the mining roadway.

[0018] According to the present invention, a method for filling underground mining roadway chambers with coal gangue-based waste is provided, wherein the filling system includes a filling pump, filling material, a mixing tank, and filling pipelines;

[0019] The mixing tank is used to add water to the filling material and mix it to form the slurry;

[0020] The filling pump is used to transport the slurry in the mixing tank to the multiple chambers through the filling pipeline.

[0021] According to the present invention, a method for filling underground mining roadways chambers containing coal gangue-based waste includes, prior to the step of filling multiple chambers with slurry using the filling system, the method further comprising:

[0022] A retaining wall is erected for each of the chambers to seal the entrance and exit of the chambers. A filling hole is left in the retaining wall, and the filling pipe passes through the filling hole to fill the chamber with slurry.

[0023] According to the present invention, a method for filling underground mining roadways chambers containing coal gangue-based waste includes the step of using the filling system to fill multiple chambers with slurry, comprising:

[0024] Determine the farthest distance transported by the filling pump, and the distance between the intermediate chamber and the two end chambers among the plurality of chambers;

[0025] When the farthest distance delivered by the filling pump is greater than the distance between the two end chambers, the minimum length of the filling pipeline is determined based on the maximum value among the distances between the two end chambers.

[0026] If the actual length of the filling pipeline is less than the minimum length, the filling pipeline shall be lengthened.

[0027] The slurry is transported to the chamber through the extended filling pipeline.

[0028] According to the present invention, a method for filling underground mining roadway chambers with coal gangue-based waste is provided, wherein the filling material is cement.

[0029] This invention provides a method for filling underground mining roadway chambers with coal gangue-based waste. By placing the waste in the mining roadway into the chamber and filling it with grout using a filling system, the waste and grout solidify to form a solidified filling body, which improves the support capacity of the chamber, thereby improving the bearing capacity and stability of narrow coal pillars. It also reduces the impact of exposed roof in the goaf on the stress concentration near the mining roadway and permanent chambers, and simultaneously achieves the treatment of waste in the mining roadway, thus improving the underground environment. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic flowchart of a method for filling underground mining roadway chambers with coal gangue-based waste provided by the present invention;

[0032] Figure 2 This is a vertical cross-section of the chamber, mining roadway, and coal pillar, which is mainly used to show the method for filling underground mining roadways with coal gangue-based waste provided by the present invention.

[0033] Figure 3 This is a vertical cross-section of the underground mining roadway chamber, mining roadway, and coal pillar, which is mainly used to show the chamber, mining roadway, and coal pillar in another direction in the method for filling coal gangue-based waste in the mine provided by the present invention.

[0034] Figure 4This is a comparison diagram of the side pressure curves of the roadway before and after filling the chamber in a method for filling underground mining roadways for coal gangue-based waste provided by the present invention.

[0035] Figure 5 This is a structural schematic diagram mainly used to illustrate the filling system in a method for filling underground mining roadways and chambers of coal gangue-based waste provided by the present invention.

[0036] Figure 6 This is a schematic diagram of the structure of the retaining wall, which is mainly used to illustrate a method for filling underground mining roadways with coal gangue-based waste provided by this invention.

[0037] Figure label:

[0038] 1: Goaf; 2: Narrow coal pillar; 3: Exposed chamber; 4: Sectional narrow coal pillar; 5: Filling hole; 6: Retaining wall; 7: Filling pump; 8: Filling material; 9: Mixing tank; 10: Filling pipeline. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0040] The following is combined Figures 1 to 6 The present invention describes a method for filling chambers in underground mining roadways containing coal gangue-based waste, comprising:

[0041] Step 101: Place the coal gangue-based waste in the mining roadway into multiple chambers in the mining roadway;

[0042] Optionally, the chambers in the mining roadway include one or more of the following: pressure relief chambers and underground chambers for storing items.

[0043] Optionally, the chamber can be one or more of a horizontal chamber, an inclined chamber, or a vertical chamber.

[0044] The coal gangue-based waste in the mining roadway includes leftover backboard planks of the support frame, coal slurry, loose coal, and coal gangue within 100 meters of the chamber.

[0045] In one feasible implementation, coal gangue-based waste can be transported to the nearest chamber for convenient storage, thereby saving manpower.

[0046] In another feasible implementation, the remaining back support planks of the scaffold can be placed into the horizontal chamber and connected to the original support structure of the chamber as a whole by fasteners such as bolts, so as to jointly resist the lateral pressure on the chamber.

[0047] In another feasible implementation, coal slime, loose coal, and coal gangue can be transported and piled in a vertical chamber, making it easier to utilize the longitudinal space of the chamber and facilitating the transportation and storage of coal slime or loose coal.

[0048] In cases where loose coal, coal gangue, and remaining backing planks of the scaffolding are placed in the same chamber, the loose coal or coal gangue and other mining waste are first backfilled into the chamber, and then the remaining backing planks of the scaffolding are moved into the chamber.

[0049] In one feasible implementation, coal gangue is laid out in the chamber and its surface is leveled. Then, the remaining backing planks of the support frame are inserted onto the coal gangue, so that the coal gangue and the planks together form a simple support structure.

[0050] In other feasible implementations, coal gangue is piled up along the walls of the chamber, and the remaining backing planks or other waste materials are placed in the open space in the center of the chamber to facilitate the operation of the staff.

[0051] Step 102: Install the filling system in the middle chamber among the multiple chambers;

[0052] The filling system is used to fill multiple chambers in the mining roadway to form a solid support structure and relieve the concentrated stress of the narrow coal pillars around the chamber.

[0053] Since the chambers are located along the return roadway, the filling system is installed in the middle chamber to facilitate filling the chambers at both ends of the return roadway, thus reducing the number of times the filling system needs to be installed or moved.

[0054] Step 103: Use the filling system to fill the multiple chambers with slurry, so that the slurry and the coal gangue-based waste form a solidified filling body.

[0055] Optionally, the grout can be cement grout, gypsum grout, inorganic cementitious material grout, etc. This embodiment does not limit the type of grout or the material ratio of the grout.

[0056] Different slurries can be flexibly selected to fill the chambers based on the density of the chambers, the stress of the coal pillars around the chambers, and the process of the filling system.

[0057] The filling system is used to fill multiple chambers in the mining roadway with filling slurry in a certain order. After the slurry solidifies, it co-solidifies with the coal gangue-based waste piled in the chamber to form a solidified filling body.

[0058] Optionally, the order can be the order of distance from the filling system, the order of extension of the working face, or the order of the chambers according to the coal pillar stress from large to small after the coal pillar stress is detected.

[0059] Among them, the coal gangue-based waste pre-stacked in the chamber plays a role similar to the steel reinforcement in a reinforced concrete structure, further strengthening the supporting capacity of the chamber after filling, jointly supporting the overlying strata, and thus improving the bearing capacity and stability of the coal pillars around the chamber.

[0060] This invention discloses a method for filling underground mining roadway chambers with coal gangue-based waste. By placing the waste in the mining roadway into the chamber and filling it with grout using a filling system, the waste and grout solidify to form a solidified filling body, which improves the support capacity of the chamber, thereby improving the bearing capacity and stability of narrow coal pillars. It also reduces the impact of exposed roof in the goaf on the stress concentration near the mining roadway and permanent chambers, and simultaneously achieves the treatment of waste in the mining roadway, thus improving the underground environment.

[0061] In a method for filling underground mining roadways with coal gangue-based waste materials according to the present invention, after the step of filling multiple chambers with slurry using the filling system, the method further includes:

[0062] After the slurry filling of the multiple chambers is completed, the longwall face below the longwall roadway is mined to form a coal pillar of the first width.

[0063] When mining the longwall face below the longwall roadway, it is necessary to retain a certain amount of material on the side of the longwall face facing the coal mining area. Figure 2 The narrow coal pillar shown in Figure (d) is used to support the mining roadway. Figure 2 The return air roadway is the mining roadway; the width of the narrow coal pillar in a section is the thickness of the coal pillar. Different widths of the narrow coal pillar in a section result in different supporting pressures on the mining roadway, and the location of the mining roadway in the next working face will also be different.

[0064] Combined with reference Figure 3 , Figure 3 Figure (a) shows the chamber before filling. The chamber is located on the side of the mining roadway away from the goaf, and the side of the mining roadway closer to the goaf retains a narrow coal pillar for its support; Figure (b) shows the chamber after filling, and the resulting solidified filling body becomes an integral part of the coal pillar of the mining area. Figure 3 Figure (c) shows a section of narrow coal pillars, the first width of which is retained after the longwall face below the longwall roadway has been mined. This section forms the longwall roadway for the next working face. The narrow coal pillars and the filled chamber become a single unit, as shown in Figure (c). Figure 4As shown, this reduces the stress concentration of the exposed roof in the goaf on the mining roadway and near the permanent chamber, thus relieving pressure on the mining roadway.

[0065] After multiple chambers are filled with slurry, the slurry and waste form a solidified filling body, which improves the support stability of the chambers and provides lateral restraint for narrow coal pillars.

[0066] Therefore, when mining the longwall face, the width of the first coal pillar can be made smaller than that before the chamber is filled.

[0067] In this embodiment, the first width ranges from 5 to 8 meters.

[0068] In other feasible embodiments, an appropriate first width can be selected based on the stress of the coal pillar near the backfill roadway or permanent chamber after the chamber is filled.

[0069] This invention discloses a method for filling underground mining roadways with coal gangue-based waste. By increasing the support force at the chamber and reducing the stress of the coal pillars near the mining roadway, the width of the narrow coal pillars that need to be retained is reduced. This increases the coal mining output while allowing the mining roadway to avoid the peak lateral support pressure of the goaf, thus reducing the main hazards during the mining process.

[0070] In the present invention, a method for filling underground mining roadway chambers of coal gangue-based waste is used to mine the mining face below the mining roadway before or simultaneously with filling the multiple chambers with slurry, thereby forming a coal pillar of a second width.

[0071] The second width is greater than the first width, which gives the narrow coal pillar section of the second width better load-bearing capacity.

[0072] If mining is carried out on the longwall face before or during the filling of the slurry in the chamber, and the slurry does not solidify with the waste to form a solidified filling body, then a second-width coal pillar needs to be retained to provide sufficient support for the longwall roadway.

[0073] After the slurry filling of the multiple chambers is completed, the coal pillar of the second width is mined back to form the coal pillar of the first width.

[0074] When the slurry filling of the chamber is carried out simultaneously with the mining of the longwall face, and the slurry filling of the chamber is completed and the slurry and waste form a solidified filling body, mining continues until the narrow coal pillar in the reserved area changes from the second width to the first width, thereby increasing the coal mining volume while ensuring the safety of the longwall face.

[0075] In the method for filling underground mining roadways with coal gangue-based waste materials according to the present invention, the step of using the filling system to fill multiple chambers with slurry includes:

[0076] While filling multiple chambers with grout, the longwall face is being mined, and the filling system is used to fill multiple chambers with grout along the advancing direction of the longwall face below the longwall roadway.

[0077] When the filling of the chamber with grout and the mining of the longwall face are carried out simultaneously, the advancing direction of the longwall face is selected as the filling direction of the chamber.

[0078] like Figure 2 As shown in the figure, the arrows indicate the direction of advancement of the longwall mining face. Figure 2 Figures (a), (b), and (c) show the sequential filling of exposed chambers in the mining roadway, starting from the chamber at the beginning of the advance direction.

[0079] After the chambers in the upper section of the mining roadway are filled, mining work will begin after the mining roadway is excavated in the lower section of the mining face.

[0080] This invention unifies the filling direction of the chamber with the advancing direction of the longwall face. Once the solidified filling material in the chamber at the starting position of the longwall face advance is formed, mining operations can commence, thus improving the efficiency of the longwall mining operation.

[0081] In the present invention, a method for filling chambers in underground mining roadways for coal gangue-based waste is provided, wherein the plurality of chambers in the mining roadway include a chamber located on the lower side of the mining roadway.

[0082] The lower side of a mining roadway is the side of the mining roadway facing downwards towards the coal seam.

[0083] like Figure 2 As shown, in this embodiment, the lower side of the mining roadway is the side of the mining roadway closest to the narrow coal pillar in the section, that is, the side closest to the coal mine to be mined.

[0084] This invention reduces the stress on narrow coal pillars and increases their supporting force by filling the chambers located on the lower side of the mining roadway before coal mining operations, thereby improving the safety of the mining roadway during mining operations.

[0085] In the present invention, a method for filling chambers in underground mining roadways for coal gangue-based waste, the plurality of chambers in the mining roadway also includes a chamber located on the upper side of the mining roadway.

[0086] The upper side of a mining roadway is the side of the mining roadway facing upwards from the coal seam.

[0087] In this embodiment, the upper side of the mining roadway is the side of the mining roadway away from the narrow coal pillar of the section, that is, the side close to the goaf.

[0088] This invention improves the support capacity of the coal pillars located above the mining roadway by filling the chambers on the upper side of the mining roadway, thereby reducing the impact of goaf collapse on the safety of the mining roadway and further improving the safety of the mining roadway during mining operations.

[0089] In the present invention, a method for filling underground mining roadway chambers with coal gangue-based waste, the filling system includes a filling pump, filling material, a mixing tank, and filling pipelines;

[0090] In this embodiment, refer to Figure 5 The filling system is located in a chamber on the lower side of the mining roadway.

[0091] The filling material is a high-moisture filling material, which can absorb a large amount of water and expand upon contact with water, forming a gel-like substance. The filling material is stacked along the sidewalls of the chamber.

[0092] The mixing tank is positioned on the side of the filling material to facilitate the addition of filling material into the mixing tank.

[0093] The filling pump is located on the side of the mixing tank away from the filling material and is connected to both the mixing tank and the filling pipeline.

[0094] The mixing tank is used to add water to the filling material and mix it to form the slurry;

[0095] The filling material and water are mixed in a mixing tank and stirred evenly by a stirring mechanism in the mixing tank. At the same time, the continuous stirring by the stirring mechanism prevents the filling material from condensing in the mixing tank after mixing with water.

[0096] This application does not limit the shape of the mixing tank or the setting of the mixing mechanism in the mixing tank.

[0097] The filling pump is used to transport the slurry in the mixing tank to the multiple chambers through the filling pipeline.

[0098] The filling material, after being mixed with water in the mixing tank, is pumped into multiple chambers through filling pipelines by the filling pump to fill the chambers.

[0099] The head of a filling pump is the height to which the pump can overcome resistance and increase the pumped liquid; the flow rate of a filling pump refers to the volume of liquid transported by the pump per unit time; the head and flow rate of a filling pump determine the conveying distance of the filling pump.

[0100] Optionally, a filling pump with appropriate head and flow rate can be selected based on the distance between the chamber furthest from the filling system and the filling system.

[0101] In a method for filling underground mining roadways with coal gangue-based waste materials according to the present invention, before the step of filling multiple chambers with slurry using the filling system, the method further includes:

[0102] A retaining wall is erected for each of the chambers to seal the entrance and exit of the chambers. A filling hole is left in the retaining wall, and the filling pipe passes through the filling hole to fill the chamber with slurry.

[0103] The retaining wall is set at the entrance of the chamber to enclose it.

[0104] The retaining wall in this embodiment is as follows: Figure 6 As shown, the retaining wall is constructed of red bricks. Two filling holes are pre-drilled during construction. In this embodiment, the two filling holes are located 1.5 meters apart from both sides of the retaining wall.

[0105] Optionally, when the retaining wall is built vertically, the filling hole is located at the top of the retaining wall.

[0106] Alternatively, if there are leftover red bricks during the construction of the retaining wall, a supporting structure can be built inside the chamber using red bricks to further improve the supporting capacity of the chamber after filling.

[0107] After the retaining wall is built, the filling pipe extends into the chamber through one of the filling holes to fill the chamber. The other filling hole is used as a vent. When the grout overflows from the other filling hole, it means that the chamber filling is complete.

[0108] In the method for filling underground mining roadways with coal gangue-based waste materials according to the present invention, the step of using the filling system to fill multiple chambers with slurry includes:

[0109] Determine the farthest distance transported by the filling pump, and the distance between the intermediate chamber and the two end chambers among the plurality of chambers;

[0110] The maximum distance of a filling pump is affected by the pump model and the properties of the slurry. For example, a higher density and viscosity of the slurry will reduce the pump's delivery distance.

[0111] Optionally, the maximum distance that the filling pump can deliver can be roughly estimated based on the pump's own head parameters and slurry density.

[0112] Measure the distances between the middle chamber and the two end chambers respectively, and determine the longer distance as the farthest distance to be transported, which is used for comparison with the farthest distance transported by the filling pump.

[0113] When the farthest distance delivered by the filling pump is greater than the distance between the two end chambers, the minimum length of the filling pipeline is determined based on the maximum value among the distances between the two end chambers.

[0114] The furthest distance transported by the filling pump is greater than the distance between the two chambers, meaning that the power of the filling pump actually used can meet the filling system's requirements for filling the furthest chamber.

[0115] At this point, the maximum value of the distances between the two chambers is the farthest distance that needs to be transported, which is also the minimum length of the filling pipeline, so that the filling pipeline has enough length to fill the farthest chamber.

[0116] If the actual length of the filling pipeline is less than the minimum length, the filling pipeline shall be lengthened.

[0117] If the actual length of the filling pipeline is less than the minimum length, the filling pipeline is lengthened to fill chambers whose distance from the filling system exceeds the actual length of the filling pipeline.

[0118] The slurry is transported to the chamber through the extended filling pipeline.

[0119] The extended filling pipeline can deliver grout to the chamber furthest from the filling system.

[0120] In the present invention, a method for filling underground mining roadway chambers with coal gangue-based waste, the filling material is cement.

[0121] Compared to other common filling materials, cement has higher strength and can withstand greater loads and pressures, thus better improving the strength and support capacity of narrow coal pillars after filling the chamber.

[0122] Meanwhile, cement has good durability and can provide support for a long time after filling. Furthermore, cement is easy to apply and readily suitable for underground construction environments.

[0123] Optionally, the water-cement ratio of the cement is 0.4.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for filling chambers in underground mining roadways containing coal gangue-based waste, characterized in that, include: The coal gangue-based waste in the mining roadway is placed into multiple chambers in the mining roadway; The filling system is installed in the middle chamber among the multiple chambers; The filling system is used to fill the multiple chambers with slurry, so that the slurry and the coal gangue-based waste form a solidified backfill; Also includes: Before or simultaneously with filling the multiple chambers with slurry, the mining face below the mining roadway is mined to form a coal pillar of a second width. After the slurry filling of the multiple chambers is completed, the coal pillar of the second width is mined back to form the coal pillar of the first width.

2. The method for filling underground mining roadway chambers with coal gangue-based waste materials according to claim 1, characterized in that, The steps of filling the plurality of chambers with grout using the filling system include: While the longwall face is being mined, the filling system is used to fill the multiple chambers with slurry along the advancing direction of the longwall face.

3. The method for filling underground mining roadway chambers with coal gangue-based waste as described in claim 1, characterized in that, The multiple chambers in the mining roadway include chambers located on the lower side of the mining roadway.

4. The method for filling underground mining roadway chambers with coal gangue-based waste as described in claim 3, characterized in that, The multiple chambers in the mining roadway also include chambers located on the upper side of the mining roadway.

5. A method for filling underground mining roadway chambers with coal gangue-based waste materials according to any one of claims 1-4, characterized in that, The filling system includes a filling pump, filling material, mixing tank, and filling pipeline; The mixing tank is used to add water to the filling material and mix it to form the slurry; The filling pump is used to transport the slurry in the mixing tank to the multiple chambers through the filling pipeline.

6. A method for filling underground mining roadway chambers with coal gangue-based waste materials according to claim 5, characterized in that, Prior to the step of filling the plurality of chambers with grout using the filling system, the method further includes: A retaining wall is erected for each of the chambers to seal the entrance and exit of the chambers. A filling hole is left in the retaining wall, and the filling pipe passes through the filling hole to fill the chamber with slurry.

7. A method for filling underground mining roadway chambers with coal gangue-based waste materials according to claim 5, characterized in that, The steps of filling the plurality of chambers with grout using the filling system include: Determine the farthest distance transported by the filling pump, and the distance between the intermediate chamber and the two end chambers among the plurality of chambers; When the farthest distance delivered by the filling pump is greater than the distance between the two end chambers, the minimum length of the filling pipeline is determined based on the maximum value among the distances between the two end chambers. If the actual length of the filling pipeline is less than the minimum length, the filling pipeline shall be lengthened. The slurry is transported to the chamber through the extended filling pipeline.

8. A method for filling underground mining roadway chambers with coal gangue-based waste materials according to claim 5, characterized in that, The filling material is cement.

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