A method for roof filling construction of a top pillar stope of an underground mine

Abstract

The present application relates to the technical field of mining, in particular to a kind of underground mine pillar stope top filling construction method, including construction main feed inlet, construction backfill feed pipe, construction dehydration pipe and positioning pipe, construction filling retaining wall and filling top.The method provides site conditions for subsequent filling construction by reasonably planning pillar stope stoping layout, and advance in the drilling phase construction good through hole and filling auxiliary hole, and the through hole is used as filling main feed inlet, and the function is to pass through the upper passage.The filling auxiliary hole is mainly used for lifting dehydration pipe, positioning pipe and backfill feed pipe, as dehydration, air evacuation, reverse filling top connection and top connection positioning signal, effectively solve the problems of large installation risk of dehydration pipe and feed pipe in pillar stope filling, and low filling top connection.The underground mine pillar stope top filling construction method has the advantages of reasonable design, simple construction, high efficiency, safety and reliability, and can greatly reduce the construction difficulty of pillar filling.

Description

Technical Field

[0001] The present invention relates to the field of mining technology, in particular to a roof filling construction method for a top pillar stope of an underground mine. Background Art

[0002] In recent years, backfill mining has been widely used in nonferrous and precious metal mines, particularly with the continuous advancement of backfill materials, backfill processes, pipeline transportation equipment, and technology. Among underground metal mining operations, top pillar mining is a common method, characterized by its high safety and high recovery difficulty. Some lead and zinc mines have steeply inclined ore bodies. These mines are typically operated using shallow hole mining and large-diameter deep hole backfill. Both methods require a top pillar approximately 6 to 8 meters high above the stope.

[0003] The filling of top pillar mines currently faces the problems of high construction difficulty, high risk, difficulty in dewatering, and difficulty in achieving a roof. Top pillar mines generally have filling bodies on both the upper and lower parts of the existing mines. Since the upper part is the filling body, the roof collapses or collapses easily after the mining blasting operation, causing the roof of the top pillar mine to be too high and uneven, which in turn affects the subsequent filling construction and prevents the formation of an effective roof. Ultimately, the mining of other surrounding mines has roof spans that are extremely high and prone to collapse, posing a huge safety hazard. Due to the incomplete and unreasonable layout of the old projects such as the surrounding mines and tunnels in the early stage, after the top pillar mine was mined as a residual ore body, some goafs could not use the existing projects to drill filling and material cutting holes on their upper parts, and dewatering pipes could not be installed normally, making it difficult to achieve filling and roofing. In particular, the dewatering pipes must be installed from the top of the mine to the bottom. The construction process of entering the goaf is risky and difficult, and safety accidents are prone to occur.

[0004] To address the above-mentioned situation, patent publication number CN116181409A discloses a backfill drainage system and construction method. This patent improves the backfill dewatering capacity of the mine, shortens the backfill slurry solidification period, and enhances mine production efficiency. It addresses engineering problems currently encountered in backfill technology, such as low dewatering efficiency, long backfill solidification period, low early backfill strength, and high internal lateral pressure affecting backfill stability. This significantly improves backfill efficiency and ensures backfill stability. However, this technical solution utilizes a pre-buried negative Poisson's ratio dewatering device with a modular design, making it difficult to operate. The entire operation requires workers to enter the chamber, resulting in an unsafe construction environment. Furthermore, in this technical solution, both the top and bottom of the chamber are solid pillars, which are prone to roofing during the filling process. However, in order to maximize mineral resource recovery, some existing top pillar mines are relatively fully mined, resulting in the surrounding area often being surrounded by solidified backfill. Especially at the top of the top pillar mining area, the filling body is prone to falling during the construction process, and the roof span is too high, which makes the construction difficult and the construction safety conditions poor. Summary of the Invention

[0005] In order to overcome one of the shortcomings of the existing technology, the purpose of the present invention is to provide a roof filling construction method for the top pillar mining area of ​​an underground mine. This roof filling construction method for the top pillar mining area of ​​an underground mine has low construction difficulty and is suitable for use in top pillar mining areas with high risks, dehydration and difficulty in roof filling.

[0006] In order to solve the above problems, the technical solutions adopted by the present invention are as follows:

[0007] A method for roof filling construction of a mountain pillar stope in an underground mine, comprising the following steps:

[0008] Construction of main feed port: planning the mining plan according to the top pillar stope situation and determining and constructing the main feed port;

[0009] Construction of the back-filling feed pipe: construct a filling auxiliary hole from bottom to top in the connecting channel at one end of the top pillar stope away from the main feed port and close to the lower part of the goaf, slanting toward the top of the goaf. The bottom of the filling auxiliary hole is connected to the area of ​​the goaf close to the roof. Insert a flexible steel wire rope from the connecting channel into the filling auxiliary hole and tie the inserted end of the flexible steel wire rope to the end of the back-filling feed pipe in one end of the connecting channel close to the goaf. Pull the flexible steel wire rope in the connecting channel so that the end of the back-filling feed pipe is lifted above the height of the bottom of the filling auxiliary hole, and fix the back-filling feed pipe.

[0010] Construction of dewatering pipe and positioning pipe: Make a flexible dewatering pipe, install the positioning pipe on one end of the dewatering pipe, and make sure the end of the positioning pipe extends at least 0.2m beyond the corresponding end of the dewatering pipe. Use the reverse-filling feed pipe hoisting method to hoist the dewatering pipe until the end of the positioning pipe is pulled and flush with the roof in the goaf, and then fix the positioning pipe and dewatering pipe;

[0011] Construction of backfill retaining wall: construct backfill retaining wall at one end of the joint track close to the goaf, and the other ends of the backfill feed pipe, positioning pipe and dewatering pipe are all passed through the backfill retaining wall and placed in the joint track;

[0012] Filling and capping: Pour filling slurry into the main feed port until the main feed port is filled to the point where no more material can be fed, and continue filling into the goaf through the back-filling feed pipe; when the slurry is discharged from one end of the positioning pipe in the joint channel, stop filling, and seal the ends of the positioning pipe and the back-filling feed pipe in the joint channel to complete the filling work.

[0013] Furthermore, in the step of constructing the backfill feed pipe, the following steps are specifically included:

[0014] After the top pillar stope is completed, an auxiliary filling hole is constructed from bottom to top in the lower connecting channel of the top pillar stope, which is close to the goaf and away from the main feed port. The auxiliary filling hole is located on one side of the diagonal area of ​​the main feed port. The bottom of the auxiliary filling hole penetrates the side of the goaf and is connected to the goaf.

[0015] Use a flexible steel wire rope to penetrate the filling auxiliary hole until it bypasses the bottom of the filling auxiliary hole and then falls onto the free surface of the goaf; continue to penetrate the flexible steel wire rope until the end of the flexible steel wire rope hangs down and falls onto the end of the joint connected to the free surface, use a tool to hook the flexible steel wire rope into the joint, and use the flexible steel wire rope to tie and secure the back-filling feed pipe in an area at least 1m away from the end in the joint;

[0016] Pull the flexible steel wire rope in the channel to drive the end of the counter-charging feed pipe to be gradually lifted until the binding point of the flexible steel wire rope and the counter-charging feed pipe rises to the bottom of the filling auxiliary hole, stop pulling the flexible steel wire rope and fix the counter-charging feed pipe.

[0017] Furthermore, the inclination angle of the filling auxiliary hole is 45-60°.

[0018] Furthermore, the projection of the auxiliary filling hole in the horizontal direction coincides with the direction of the connecting channel.

[0019] Furthermore, in the step of constructing the main feed port, the following steps are specifically included:

[0020] Plan the mining plan for the entire top pillar stope according to the top pillar stope situation, and pre-form rock drilling tunnels and connecting tunnels during the top pillar stope mining process;

[0021] Several through holes are constructed from bottom to top on the side wall of the rock drilling tunnel away from the connecting road, and the through holes are connected to the nearest passage;

[0022] All through-holes and the side walls of the rock drilling tunnels are blasted to form the main feed port and the goaf. The diameter of the main feed port is 0.5-1m, and the construction of the main feed port and the goaf is completed.

[0023] Furthermore, in the steps of constructing the dehydration pipe and the positioning pipe, the following steps are specifically included:

[0024] Use the wire mesh to roll into a round steel wire tube with a diameter of 0.18-0.22m, then wrap the outside of the steel wire tube with gauze and use a band to tie the gauze to the steel wire tube. The outer wall of the steel wire tube is wrapped with no more than two layers of gauze to obtain a flexible dehydration tube;

[0025] A positioning pipe is tied to one end of the dehydration pipe, and the end of the positioning pipe extends outward at least 0.2m from the end of the corresponding end of the dehydration pipe to obtain a combination of the positioning pipe and the dehydration pipe;

[0026] Use a flexible steel wire rope to penetrate the filling auxiliary hole until it bypasses the bottom of the filling auxiliary hole and then falls onto the free surface of the goaf; continue to penetrate the flexible steel wire rope until the end of the flexible steel wire rope falls into the end of the joint track connected to the free surface of the goaf, use a tool to hook the flexible steel wire rope into the joint track, and use the flexible steel wire rope to tie and secure the positioning pipe and dehydration pipe combination in an area at least 1m away from the end of the joint track;

[0027] Pull the flexible steel wire rope in the joint to drive the end of the positioning pipe and dehydration pipe combination to be gradually lifted up until the end of the pulled positioning pipe is flush with the roof in the goaf, stop pulling the flexible steel wire rope, fix the positioning pipe and dehydration pipe, and complete the installation of the positioning pipe and dehydration pipe.

[0028] Furthermore, the steel wire tube needs to be bound on the outer wall by iron wires before being wound with gauze, and the iron wires are arranged at intervals of 0.8-1m along the length direction of the steel wire tube.

[0029] Furthermore, in the step of constructing the filling retaining wall, when constructing the filling retaining wall, movable holes are reserved for the back-filling feed pipe, positioning pipe and dehydration pipe to pass through the filling retaining wall, and the gaps between the back-filling feed pipe, positioning pipe and dehydration pipe and the filling retaining wall can be sealed by cement mortar or filling sandbags.

[0030] Furthermore, in the filling and topping step, when the main feed port is filled to the point where no more material can be fed, it is necessary to continue to intermittently pour the filling slurry until the filling slurry overflows.

[0031] Furthermore, after the slurry is discharged from one end of the positioning tube in the channel, the end of the positioning tube in the channel is sealed first, and then pressure filling is slowly continued through the back-filling feed pipe until the back-filling feed pipe can no longer be filled with slurry or the filling pressure exceeds the preset pressure value. At this time, the back-filling feed pipe is sealed again to complete the filling work.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The method for roof filling construction of a top pillar stope of an underground mine of the present invention provides on-site conditions for subsequent filling construction by rationally planning the layout of the top pillar stope mining, and constructs through holes and filling auxiliary holes in advance in the drilling stage. The through holes are used to penetrate the upper channel and serve as the main filling feed port. The filling auxiliary holes are mainly used to hoist dewatering pipes, positioning pipes and reverse filling feed pipes, and are used for dehydration, air exhaust, reverse filling and top connection and top connection positioning signals, effectively solving the problems of high installation risks of dewatering pipes and feed pipes in the top pillar stope and low filling top connection. The method for roof filling construction of a top pillar stope of an underground mine has the advantages of reasonable design, simple construction, high efficiency, safety and reliability, and can greatly reduce the construction difficulty of top pillar filling.

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a longitudinal sectional view of a top pillar stope in an embodiment of the present invention;

[0036] Figure 2 It is a plan view of the top pillar stope according to an embodiment of the present invention.

[0037] Description of Figure Numbers: DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] See also Figures 1 to 2 The present application provides a method for roof filling construction of a mountain pillar stope in an underground mine, comprising the following steps:

[0040] Construction of main feed port 1: planning the mining plan based on the top pillar stope conditions and determining and constructing the main feed port 1;

[0041] Construction of the back-filling feed pipe 3: In the top pillar stope, in the connecting channel 5 at one end away from the main feed port 1 and close to the lower part of the goaf 2, an auxiliary filling hole 4 is constructed from bottom to top in an inclined direction toward the top of the goaf 2. The bottom of the auxiliary filling hole 4 is connected to the area of ​​the goaf 2 close to the roof 9. A flexible steel wire rope 6 is inserted from the connecting channel 5 into the auxiliary filling hole 4, and the inserted end of the flexible steel wire rope 6 is tied to the end of the back-filling feed pipe 3 in the end of the connecting channel 5 close to the goaf 2. The flexible steel wire rope 6 is pulled in the connecting channel 5 so that the end of the back-filling feed pipe 3 is lifted above the height of the bottom of the auxiliary filling hole 4, and the back-filling feed pipe 3 is fixed.

[0042] Construction of dehydration pipe 7 and positioning pipe 8: Make a flexible dehydration pipe 7, install the positioning pipe 8 on one end of the dehydration pipe 7, and make the end of the positioning pipe 8 facing outward extend at least 0.2m compared with the corresponding end of the dehydration pipe 7. Use the hoisting method of the back-filling feed pipe 3 to hoist the dehydration pipe 7 until the end of the positioning pipe 8 is pulled and contacts the roof 9 in the goaf 2, and fix the positioning pipe 8 and the dehydration pipe 7;

[0043] Construction of the backfill retaining wall 10: The backfill retaining wall 10 is constructed in one end of the link 5 close to the goaf 2. The other ends of the backfill feed pipe 3, the positioning pipe 8 and the dewatering pipe 7 are all passed through the backfill retaining wall 10 and placed in the link 5;

[0044] Filling and capping: Pour filling slurry into the main feed port 1 until the main feed port 1 is filled to the point where no more material can be fed, and then continue filling into the goaf 2 through the back-filling feed pipe 3; when the slurry is discharged from one end of the positioning pipe 8 in the connecting channel 5, stop filling, and seal the ends of the positioning pipe 8 and the back-filling feed pipe 3 in the connecting channel 5 to complete the filling work.

[0045] In fact, in the actual construction process, the situation of the goaf 2 can be first three-dimensionally modeled through acoustic wave detection and seismic scattering imaging technology, and then the top pillar mining site can be evaluated and planned based on the obtained three-dimensional model. The height of the roof 9 in different areas of the goaf 2 can be planned and mined according to the three-dimensional model, and at the same time, a connecting channel 5 can be adaptively formed, that is, the connecting channel 5 is located on the side with a relatively low height of the roof 9, and the main feed port 1 is later opened on the side with a relatively high height of the roof 9. Such a design is conducive to the later stage of fully filling the slurry and achieving roof formation.

[0046] The aforementioned auxiliary filling holes 4 are provided with at least two, primarily because this solution requires two hoisting operations. Of course, in some improved embodiments, the auxiliary filling holes 4 can be larger holes formed by merging multiple drilled holes. In actual construction, the diameter of the auxiliary filling holes 4 is between 4 and 8 cm, making this structure easily adaptable to the flexible steel wire rope 6. Furthermore, when threading the flexible steel wire rope 6 through the auxiliary filling holes 4, a push rod can be used to push the end of the flexible steel wire rope 6 out from the bottom of the auxiliary filling holes 4, allowing it to fall into the goaf 2. During actual operation, the end of the flexible steel wire rope 6 is tied with a vertical weight. This allows the end of the flexible steel wire rope 6 to automatically fall to the bottom after falling into the goaf 2, allowing workers to use tools to pull the drooping end of the flexible steel wire rope 6 into the gantry 5. This allows workers to tie the backfill feed pipe 3 within the gantry 5, preventing it from entering the goaf 2 and reducing the risk of falling.

[0047] In one embodiment of the present application, the steps of constructing the main feed port 1 specifically include the following steps:

[0048] According to the situation of the top pillar stope, the mining plan of the entire top pillar stope is planned, and the rock drilling road and the connecting road 5 connected to the rock drilling road are pre-formed during the mining process of the top pillar stope;

[0049] A plurality of through holes are constructed from bottom to top on the side wall of the rock drilling tunnel away from the connecting road 5, and the through holes are connected to the nearest channel 11;

[0050] All through-holes and side walls of rock drilling tunnels are blasted to form the main feed port 1 and goaf 2. The diameter of the main feed port 1 is 0.5-1m, and the construction of the main feed port 1 and goaf 2 is completed.

[0051] After blasting, the ore formed by the blasting must be cleaned from the goaf 2. Only after this cleaning can the goaf 2 be formed. Drilling through holes in the rock tunnel before blasting effectively ensures construction safety. Passage 11 can be a dedicated transport tunnel for the entire stope, ensuring its stability.

[0052] See also Figures 1 to 2 In one embodiment of the present application, the steps of constructing the backfill feed pipe 3 specifically include the following steps:

[0053] After the top pillar stope is completed, an auxiliary filling hole 4 is constructed from bottom to top in the lower connecting channel 5 at the end of the top pillar stope away from the main feed port 1 and close to the goaf 2, slanting toward the top of the goaf 2. The auxiliary filling hole 4 is located on one side of the diagonal area of ​​the main feed port 1; the bottom of the auxiliary filling hole 4 penetrates the side of the goaf 2 and is connected to the goaf 2;

[0054] Use the flexible steel wire rope 6 to penetrate the filling auxiliary hole 4 until it bypasses the bottom of the filling auxiliary hole 4 and then falls onto the free surface of the goaf 2; continue to penetrate the flexible steel wire rope 6 until the end of the flexible steel wire rope 6 droops and falls onto the end of the connecting channel 5 connected to the free surface, use a tool to hook the flexible steel wire rope 6 into the connecting channel 5, and use the flexible steel wire rope 6 to tie and secure the back-filling feed pipe 3 in the connecting channel 5 at least 1m away from the end;

[0055] Pull the flexible steel wire rope 6 in the connecting channel 5 to drive the end of the counter-filling feed pipe 3 to be gradually lifted up until the bundling point of the flexible steel wire rope 6 and the counter-filling feed pipe 3 rises to the bottom of the filling auxiliary hole 4, stop pulling the flexible steel wire rope 6, and fix the counter-filling feed pipe 3.

[0056] In this embodiment, the free surface is actually the side wall of the goaf 2 in the vertical direction. In the above embodiment, the filling auxiliary hole 4 penetrates the free surface on its side so that the filling auxiliary hole 4 is connected with the goaf 2. The end of the flexible steel wire rope 6 naturally droops after passing the bottom of the filling auxiliary hole 4 and contacts the corresponding free surface. The pulling work of the flexible steel wire rope 6 can be reeled in by a hoisting device. It should be noted that the bottom of the filling auxiliary hole 4 needs to be fed close to the top plate 9, so as to ensure that the distance between the back-filling feed pipe 3 pulled up in the later stage is reduced to the top plate 9, thereby ensuring the later filling effect.

[0057] It should be noted that the flexible steel wire rope 6 is tied in an area at least 1m away from the end of the back-filling feed pipe 3. This design ensures that even when the back-filling feed pipe 3 is lifted to the top, that is, when the binding point of the flexible steel wire rope 6 and the back-filling feed pipe 3 is lifted to the bottom of the filling auxiliary hole 4, the top of the back-filling feed pipe 3 can still be higher than the bottom of the filling auxiliary hole 4. This is conducive to the later reverse filling of the slurry, ensuring that the liquid level of the filling slurry is as close to the top plate 9 as possible, and ensuring the successful filling and topping in the later stage.

[0058] In addition, to facilitate force application and construction, the inclination angle of the filling auxiliary hole 4 is 45-60 degrees. In addition, the horizontal projection of the filling auxiliary hole 4 coincides with the direction of the connecting channel 5. Such a setting can facilitate the subsequent construction operations to a certain extent. Among them, since the top pillar stope roof is the filling body, the filling body falls during the mining process, causing the stope roof 9 to be uneven. If the material is fed only at one end of the goaf 2, the problem of uneven connection caused by the unevenness of the two ends of the stope roof 9 cannot be solved. Therefore, it is necessary to reversely fill the slurry through the back-filling feed pipe 3.

[0059] In some embodiments, the steps of constructing the dehydration pipe 7 and the positioning pipe 8 specifically include the following steps:

[0060] Use the wire mesh to roll into a circular steel wire tube with a diameter of 0.18-0.22m, then wrap the outside of the steel wire tube with gauze and use a band to tie the gauze to the steel wire tube. The outer wall of the steel wire tube is wrapped with no more than two layers of gauze to obtain a flexible dehydration tube 7;

[0061] A positioning tube 8 is tied to one end of the dehydration tube 7, and the end of the positioning tube 8 extends at least 0.2m beyond the end of the corresponding end of the dehydration tube 7 to obtain a combination of the positioning tube 8 and the dehydration tube 7;

[0062] Use the flexible steel wire rope 6 to penetrate the filling auxiliary hole 4 until it bypasses the bottom of the filling auxiliary hole 4 and then falls onto the open surface of the goaf 2; continue to penetrate the flexible steel wire rope 6 until the end of the flexible steel wire rope 6 falls into the end of the connecting channel 5 connected to the open surface of the goaf 2, use a tool to hook the flexible steel wire rope 6 into the connecting channel 5, and use the flexible steel wire rope 6 to tie and secure the positioning pipe 8 and the dehydration pipe 7 combination in the connecting channel 5 at least 1m away from the end;

[0063] Pull the flexible steel wire rope 6 in the connecting channel 5 to drive the end of the positioning pipe 8 and the dehydration pipe 7 combination to be gradually lifted up until the end of the pulled end of the positioning pipe 8 is flush with the roof 9 in the goaf 2, stop pulling the flexible steel wire rope 6, fix the positioning pipe 8 and the dehydration pipe 7, and complete the installation of the positioning pipe 8 and the dehydration pipe 7.

[0064] Wherein, the gauze is a gauze of conventional mesh size. Generally speaking, the steel wire mesh is stretched in the axial direction after being wound and rolled, i.e., it is wound in a spiral manner, so that it can be wound into a continuous steel wire tube. Wherein, in order to avoid the wound steel wire tube from being loose, the steel wire tube needs to be bound by iron wire on the outer wall before being wound with gauze. The iron wire is arranged at intervals of 0.8-1m along the length direction of the steel wire tube. Such an arrangement can also play a role in strengthening the steel wire tube to a certain extent. In addition, the bundling work of the positioning pipe 8 and the dehydration pipe 7 is all operated in the link 5, which can effectively prevent personnel from entering the goaf 2 for operation, reduces the construction difficulty and operation risk, and ensures the personal safety of the construction workers.

[0065] In some embodiments, during the steps of constructing the filling retaining wall 10, in order to avoid excessive force exerted by the back-filling feed pipe 3, the positioning pipe 8 and the dehydration pipe 7 on the filling retaining wall 10 during the construction of the filling retaining wall 10 or to facilitate the adjustment of the position or height of the back-filling feed pipe 3, the positioning pipe 8 and the dehydration pipe 7 at a later stage, in one embodiment of the present application, during the construction of the filling retaining wall 10, movable holes are reserved for the back-filling feed pipe 3, the positioning pipe 8 and the dehydration pipe 7 to pass through the filling retaining wall 10, and the gaps between the back-filling feed pipe 3, the positioning pipe 8 and the dehydration pipe 7 and the filling retaining wall 10 can be sealed by cement mortar or by filling sandbags. In the present application, the sandbag sealing method is preferably used, and such a design can also play a role in dehydration in the present application.

[0066] In some embodiments, during the filling and roofing step, when the main feed port 1 is filled to the point where no more material can be fed, the filling slurry is continuously poured in intermittently until the filling slurry overflows. This is to ensure that as the filling slurry slowly fills the gaps on the roof 9 in the goaf 2, there is still sufficient filling slurry to replenish. Furthermore, this filling method requires multiple intervals of filling, so that the filling slurry has sufficient time to fill the gaps on the roof 9.

[0067] In the above-mentioned improved embodiment, after the slurry is discharged from one end of the positioning tube 8 located in the channel 5, the end of the positioning tube 8 located in the channel 5 is first sealed, and then pressure filling is slowly continued through the backfill feed pipe 3 until the backfill feed pipe 3 can no longer be filled with slurry or the filling pressure exceeds the preset pressure value. At this time, the backfill feed pipe 3 is sealed to complete the filling process. The filling slurry will decrease in height as dehydration continues, so multiple slow backfilling operations are required. The main purpose of this is to ensure that the filling slurry can successfully bond with the top plate 9.

[0068] The roof filling construction method for the top pillar mine of this underground mine provides on-site conditions for subsequent filling construction by rationally planning the mining layout of the top pillar mine. The through hole and the filling auxiliary hole 4 are constructed in advance during the drilling stage. The function of the through hole is to penetrate the upper channel 11 and serve as the main filling feed port 1. The filling auxiliary hole 4 is mainly used to hoist the dewatering pipe 7, the positioning pipe 8 and the reverse filling feed pipe 3, and is used for dehydration, air exhaust, reverse filling and top connection and top connection positioning signal, which effectively solves the problems of high installation risk of the dewatering pipe 7 and the feed pipe in the top pillar mine and low filling top connection. The roof filling construction method for the top pillar mine of this underground mine has the advantages of reasonable design, simple construction, high efficiency, safety and reliability, and can greatly reduce the construction difficulty of the top pillar filling.

[0069] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A method for roof filling construction of a top pillar stope in an underground mine, characterized in that: The following steps are involved: Construction of main feed port: planning the mining plan according to the top pillar stope situation and determining and constructing the main feed port; Construction of the back-filling feed pipe: in the top pillar mining field, an auxiliary filling hole is constructed from bottom to top in the connecting channel at one end away from the main feeding port and close to the lower part of the goaf. The bottom of the auxiliary filling hole is connected with the area of ​​the goaf close to the roof. A flexible steel wire rope is passed from the connecting channel into the auxiliary filling hole and the end of the flexible steel wire rope is tied to the end of the back-filling feed pipe in the connecting channel close to the goaf. The flexible steel wire rope is pulled in the connecting channel so that the end of the back-filling feed pipe is lifted above the height of the bottom of the auxiliary filling hole, and the back-filling feed pipe is fixed. The steps of constructing the back-filling feed pipe specifically include the following steps: After the top pillar stope is completed, an auxiliary filling hole is constructed from bottom to top in the lower connecting channel of the top pillar stope, which is close to the goaf and away from the main feed port. The auxiliary filling hole is located on one side of the diagonal area of ​​the main feed port. The bottom of the auxiliary filling hole penetrates the side of the goaf and is connected to the goaf. Use a flexible steel wire rope to penetrate the filling auxiliary hole until it bypasses the bottom of the filling auxiliary hole and then falls onto the free surface of the goaf; continue to penetrate the flexible steel wire rope until the end of the flexible steel wire rope hangs down and falls onto the end of the joint connected to the free surface, use a tool to hook the flexible steel wire rope into the joint, and use the flexible steel wire rope to tie and secure the back-filling feed pipe in an area at least 1m away from the end in the joint; Pull the flexible steel wire rope in the channel to gradually lift the tied end of the counter-filling feed pipe until the binding point of the flexible steel wire rope and the counter-filling feed pipe rises to the bottom of the filling auxiliary hole. Stop pulling the flexible steel wire rope and fix the counter-filling feed pipe. Construction of dewatering pipe and positioning pipe: Make a flexible dewatering pipe, install the positioning pipe on one end of the dewatering pipe, and make sure the end of the positioning pipe extends at least 0.2m beyond the corresponding end of the dewatering pipe. Use the reverse-filling feed pipe hoisting method to hoist the dewatering pipe until the end of the positioning pipe is pulled and flush with the roof in the goaf, and then fix the positioning pipe and dewatering pipe; Construction of backfill retaining wall: construct backfill retaining wall at one end of the joint track close to the goaf, and the other ends of the backfill feed pipe, positioning pipe and dewatering pipe are all passed through the backfill retaining wall and placed in the joint track; Filling and capping: Pour filling slurry into the main feed port until the main feed port is filled to the point where no more material can be fed, and continue filling into the goaf through the back-filling feed pipe; when the slurry is discharged from one end of the positioning pipe in the joint channel, stop filling, and seal the ends of the positioning pipe and the back-filling feed pipe in the joint channel to complete the filling work.

2. The method for roof filling construction of a mountain pillar stope in an underground mine according to claim 1, characterized in that: The inclination angle of the filling auxiliary hole is 45-60°.

3. The method for roof filling construction of a mountain pillar stope in an underground mine according to claim 1, characterized in that: The projection of the filling auxiliary hole in the horizontal direction coincides with the direction of the connecting channel.

4. The method for roof filling construction of a mountain pillar stope in an underground mine according to claim 1, characterized in that: The steps of constructing the main feed port specifically include the following steps: Plan the mining plan for the entire top pillar stope according to the top pillar stope situation, and pre-form rock drilling tunnels and connecting tunnels during the top pillar stope mining process; Several through holes are constructed from bottom to top on the side wall of the rock drilling tunnel away from the connecting road, and the through holes are connected to the nearest passage; All through-holes and the side walls of the rock drilling tunnels are blasted to form the main feed port and the goaf. The diameter of the main feed port is 0.5-1m, and the construction of the main feed port and the goaf is completed.

5. The method for roof filling construction of a mountain pillar stope in an underground mine according to claim 1, characterized in that: The steps of constructing the dewatering pipe and positioning the pipe specifically include the following steps: Use the wire mesh to roll into a round steel wire tube with a diameter of 0.18-0.22m, then wrap the outside of the steel wire tube with gauze and use a band to tie the gauze to the steel wire tube. The outer wall of the steel wire tube is wrapped with no more than two layers of gauze to obtain a flexible dehydration tube; A positioning pipe is tied to one end of the dehydration pipe, and the end of the positioning pipe extends outward at least 0.2m from the end of the corresponding end of the dehydration pipe to obtain a combination of the positioning pipe and the dehydration pipe; Use a flexible steel wire rope to penetrate the filling auxiliary hole until it bypasses the bottom of the filling auxiliary hole and then falls onto the free surface of the goaf; continue to penetrate the flexible steel wire rope until the end of the flexible steel wire rope falls into the end of the joint track connected to the free surface of the goaf, use a tool to hook the flexible steel wire rope into the joint track, and use the flexible steel wire rope to tie and secure the positioning pipe and dehydration pipe combination in an area at least 1m away from the end of the joint track; Pull the flexible steel wire rope in the joint to drive the end of the positioning pipe and dehydration pipe combination to be gradually lifted up until the end of the pulled positioning pipe is flush with the roof in the goaf, stop pulling the flexible steel wire rope, fix the positioning pipe and dehydration pipe, and complete the installation of the positioning pipe and dehydration pipe.

6. The method for roof filling construction of a mountain pillar stope in an underground mine according to claim 5, characterized in that: The steel wire tube needs to be bound on the outer wall by iron wires before being wound with gauze, and the iron wires are arranged at intervals of 0.8-1m along the length direction of the steel wire tube.

7. The method for roof filling construction of a mountain pillar stope in an underground mine according to claim 1, characterized in that: During the steps of constructing the filling retaining wall, movable holes are reserved for the back-filling feed pipe, positioning pipe and dehydration pipe to pass through the filling retaining wall. The gaps between the back-filling feed pipe, positioning pipe and dehydration pipe and the filling retaining wall can be sealed by cement mortar or filling sandbags.

8. The method for roof filling construction of a mountain pillar stope in an underground mine according to claim 1, characterized in that: During the filling and topping step, when the main feed port is filled to the point where no more material can be fed, it is necessary to continue pouring the filling slurry intermittently until the filling slurry overflows.

9. The method for roof filling construction of a mountain pillar stope in an underground mine according to claim 1, characterized in that: After the slurry is discharged from one end of the positioning tube in the channel, the end of the positioning tube in the channel is sealed first, and then pressure filling is slowly continued through the back-filling feed pipe until the back-filling feed pipe can no longer be filled with slurry or the filling pressure exceeds the preset pressure value. At this time, the back-filling feed pipe is sealed to complete the filling work.

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