Top-forming filling construction method for underground mine top pillar stope

Abstract

The invention relates to the technical field of mining, in particular to an underground mine top pillar stope top filling construction method which comprises construction of a main feeding port, construction of a reverse filling feeding pipe, construction of a dewatering pipe and a positioning pipe, construction of a filling retaining wall and filling of a top. According to the method, by reasonably planning the stoping arrangement of the top pillar stope, field conditions are provided for follow-up filling construction, a through hole and a filling auxiliary hole are constructed in advance in the punching stage, and the through hole is used for penetrating through an upper channel and serves as a filling main feeding port. The filling auxiliary hole is mainly used for hoisting a dewatering pipe, a positioning pipe and a reverse filling feeding pipe and is used for dewatering, air exhausting, reverse filling roof contact and roof contact positioning signals, and the problems that the filling dewatering pipe and the feeding pipe of the top pillar stope are large in installation risk and low in filling roof contact are effectively solved. The construction method has the advantages of being reasonable in design, simple in construction, high in efficiency, safe, reliable, capable of greatly reducing the construction difficulty of top pillar filling and the like.

Description

Technical Field

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

[0002] In recent years, the backfill mining method has been widely used in non-ferrous metal mines and precious metal mines because it can recover mineral resources to the maximum extent and protect the underground and surface environment, especially with the continuous progress of backfill materials, backfill processes, pipeline transportation equipment and technology. Among underground metal mining mines, many mines choose the top pillar mining method. The top pillar mining has the characteristics of high safety and high mining difficulty. In some lead-zinc mines, some ore bodies are steeply inclined ore bodies. Generally, two mining methods are adopted: shallow hole mining and large diameter deep hole subsequent backfill mining. Both mining methods plan to leave a top pillar of about 6 to 8 meters in height at the top of the mining site.

[0003] For the filling of the top pillar mine, there are currently problems such as high construction difficulty, high risk, difficulty in dehydration, and difficulty in roof closure. The upper and lower parts of the top pillar mine are generally the filling bodies of the filled mine, and because the upper part is the filling body, the roof collapse or collapse of the filling body is prone to occur 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 cannot form an effective roof closure. Ultimately, the mining of the remaining surrounding mines has a roof span that is too high and prone to falling, causing great safety hazards. 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 and fill the material holes on their upper part, and the dehydration pipes could not be installed normally, making it difficult to achieve filling and roof closure. In particular, the dehydration 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] In view of the above situation, the patent with publication number CN116181409A discloses a filling body drainage system and its construction method, which improves the filling dehydration capacity of the mine, shortens the solidification period of the filling slurry, improves the production efficiency of the mine, solves the engineering practice problems such as low dehydration efficiency of the current filling technology, long solidification period of the filling body, low early strength of the filling body, and large internal lateral pressure of the filling body affecting the stability of the filling body, greatly improves the filling efficiency and ensures the stability of the filling body. However, in this technical solution, a scheme of pre-buried negative Poisson's ratio dehydration device is adopted. The negative Poisson's ratio dehydration device adopts a modular design, which is troublesome to operate as a whole. The entire operation requires workers to enter the chamber to operate, resulting in an unsafe construction environment. In addition, in the above technical solution, the top and bottom of the chamber are both solid top pillars, which are easy to form a top during the filling process. In order to maximize the recovery of mineral resources, some existing top pillar mines are relatively completely mined, so that the top pillar mines are generally surrounded by solidified filling bodies on many sides. Especially at the top of the top pillar mining area, the filling body is prone to fall during the construction process, and the roof span is too high, resulting in great construction difficulty and poor construction safety conditions. Summary of the invention

[0005] In order to overcome one of the shortcomings of the prior art, the purpose of the present invention is to provide a method for roof filling construction in a top pillar mining area of ​​an underground mine. This method for roof filling construction in a 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] To solve the above problems, the technical solution adopted by the present invention is 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 inlet: planning the mining plan according to the top pillar mining site conditions and determining and constructing the main feed inlet;

[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 mining field far from the main feeding 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 with 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 end of the flexible steel wire rope to the end of the back-filling feed pipe at 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 to a height higher than 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, the end of the positioning pipe extending outwards should be at least 0.2m longer than the corresponding end of the dewatering pipe, and the dewatering pipe should be hoisted by using the reverse-filling feed pipe hoisting method until the end of the positioning pipe being pulled is flush with the roof in the goaf, and the positioning pipe and dewatering pipe are fixed;

[0011] Construction of backfill retaining wall: construct a 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 all pass through the backfill retaining wall and are 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 then 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 back-filling feed pipe, the following steps are specifically included:

[0014] When the mining preparation project of the top pillar stope is completed, a filling auxiliary hole is constructed from bottom to top in the lower connecting channel of the top pillar stope far from the main feed inlet and close to the goaf, in a direction inclined toward the top of the goaf. The filling auxiliary hole is located on one side of the diagonal area of ​​the main feed inlet; the bottom of the filling auxiliary 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 droops 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 fix the back-filling feed pipe in the joint at least 1m away from the end;

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

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

[0018] Furthermore, the projection of the filling auxiliary 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 of the entire top pillar stope according to the situation of the top pillar stope, and pre-form the rock drilling roadway and the connecting road connected to the rock drilling roadway during the mining process of the top pillar stope;

[0021] A number of 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] The steel wire mesh is rolled into a circular steel wire tube with a diameter of 0.18-0.22m, and then the gauze is wrapped around the outside of the steel wire tube and the gauze is tied and fixed on the steel wire tube with a binding tape. 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 extending outward is at least 0.2 m longer than the end of the corresponding end of the dehydration pipe, so as 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 connected to the free surface of the goaf, use a tool to hook the flexible steel wire rope into the joint, and use the flexible steel wire rope to tie and fix the positioning pipe and dehydration pipe combination in the joint at least 1m away from the end;

[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 winding the 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 mining site of an underground mine of the present invention provides on-site conditions for subsequent filling construction by rationally planning the mining layout of the top pillar mining site, and constructs through holes and filling auxiliary holes in advance in the drilling stage. The function of the through holes is to penetrate the upper passage and serve as the main filling feed port. The filling auxiliary holes are mainly used to hoist dehydration 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, which effectively solves the problems of high installation risks of dehydration pipes and feed pipes in the top pillar mining site and low filling and top connection. The method for roof filling construction of a top pillar mining site 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 is further described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a longitudinal section 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 solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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 used to limit the present invention.

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

[0040] Construction of main feed port 1: planning the mining plan according to the top pillar mining site conditions and determining and constructing the main feed port 1;

[0041] Construction of the back-filling feed pipe 3: construct a filling auxiliary hole 4 from bottom to top in the connecting channel 5 at one end of the top pillar mining field far from the main feed port 1 and close to the lower part of the goaf 2, slanting toward the top of the goaf 2, the bottom of the filling auxiliary hole 4 is connected with the area of ​​the goaf 2 close to the roof 9, insert a flexible steel wire rope 6 from the connecting channel 5 into the filling auxiliary hole 4, and tie the end of the flexible steel wire rope 6 inserted into the connecting channel 5 to the end of the back-filling feed pipe 3 at one end of the connecting channel 5 close to the goaf 2, pull the flexible steel wire rope 6 in the connecting channel 5 so that the end of the back-filling feed pipe 3 is lifted to a height exceeding the bottom of the filling auxiliary hole 4, and fix the back-filling feed pipe 3;

[0042] Construction of dewatering pipe 7 and positioning pipe 8: Make a flexible dewatering pipe 7, install the positioning pipe 8 on one end of the dewatering pipe 7, the end of the positioning pipe 8 extending outwards at least 0.2m compared to the corresponding end of the dewatering pipe 7, and hoist the dewatering pipe 7 by hoisting the back-filling feed pipe 3 until the end of the positioning pipe 8 is pulled and flush with the roof 9 in the goaf 2, and fix the positioning pipe 8 and the dewatering pipe 7;

[0043] Construction of the filling retaining wall 10: The filling retaining wall 10 is constructed in one end of the link 5 close to the goaf 2, and the other ends of the backfill feed pipe 3, the positioning pipe 8 and the dehydration pipe 7 all pass through the filling retaining wall 10 and are 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 of the roof 9 with a relatively low height, and the main feed inlet 1 is opened on the side of the roof 9 with a relatively high height in the later stage. Such a design is conducive to sufficient filling of slurry and realization of roof bonding in the later stage.

[0046] The above-mentioned filling auxiliary holes 4 are provided with at least two, and the main purpose is that two hoisting operations are required in this scheme; of course, in some improved embodiments, the filling auxiliary hole 4 can be a large hole obtained by merging multiple drill holes. In the actual construction process, the diameter of the filling auxiliary hole 4 is between 4-8 cm, and such a structure is easy to adapt to the flexible steel wire rope 6. In addition, when the flexible steel wire rope 6 is passed through the filling auxiliary hole 4, the end of the flexible steel wire rope 6 can be pushed out from the bottom of the filling auxiliary hole 4 by a push rod, so that the end of the flexible steel wire rope 6 can fall into the goaf 2. In the actual operation process, the end of the flexible steel wire rope 6 is tied with a vertical weight, so that the end of the flexible steel wire rope 6 can automatically fall to the bottom after falling into the goaf 2, so that the worker can use a tool to pull the drooping end of the flexible steel wire rope 6 into the link 5, so that the worker can tie the back-filling feed pipe 3 in the link 5 to avoid entering the goaf 2 and reduce the risk of falling.

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

[0048] According to the situation of the top pillar stope, a mining plan for the entire top pillar stope is planned, and a rock drilling tunnel and a connecting tunnel 5 connected to the rock drilling tunnel are preformed 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 passage 11;

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

[0051] After blasting, the ore formed by blasting in the goaf 2 needs to be cleaned, and the goaf 2 can be formed only after cleaning. The through hole is drilled in the rock drilling tunnel before blasting, and such a design can effectively ensure the safety of construction. The passage 11 can be the inherent transportation tunnel of the entire mining field, which can ensure the stability of the entire mining field.

[0052] See also Figure 1 to Figure 2 In one embodiment of the present application, in the step of constructing the back-filling feed pipe 3, the following steps are specifically included:

[0053] When the mining preparation project of the top pillar stope is completed, a filling auxiliary hole 4 is constructed from bottom to top in the lower connecting channel 5 close to the goaf 2 at one end of the top pillar stope far from the main feed port 1, which is inclined toward the top of the goaf 2. The filling auxiliary hole 4 is located on one side of the diagonal area of ​​the main feed port 1; the bottom of the filling auxiliary 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 into 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 link 5 connected to the free surface, use a tool to hook the flexible steel wire rope 6 into the link 5, and use the flexible steel wire rope 6 to tie and fix the back-filling feed pipe 3 in the link 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 back-filling feed pipe 3 to be gradually lifted up, until the binding point of the flexible steel wire rope 6 and the back-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 back-filling feed pipe 3.

[0056] In this embodiment, the empty 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 empty 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 bypassing the bottom of the filling auxiliary hole 4 and contacts the corresponding empty surface, and 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 later and the top plate 9 is reduced as much as possible, and the filling effect in the later stage is guaranteed.

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

[0058] In addition, in order to facilitate force application and construction, the inclination angle of the filling auxiliary hole 4 is 45-60°. In addition, the projection of the filling auxiliary hole 4 in the horizontal direction coincides with the direction of the connecting channel 5. Such a setting can facilitate the later construction operations to a certain extent. Among them, since the top plate of the top pillar mining field is the filling body, the filling body falls during the mining process, causing the mining field roof 9 to be uneven. If the material is fed at one end of the goaf 2 alone, the problem of no connection caused by the unevenness of the two ends of the mining field roof 9 cannot be solved. Therefore, it is necessary to reversely fill the slurry through the reverse 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] The steel wire mesh is rolled into a circular steel wire tube with a diameter of 0.18-0.22m, and then the gauze is wrapped around the outside of the steel wire tube and the gauze is tied and fixed to the steel wire tube with a binding tape, and 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 outward by at least 0.2 m compared to the end of the corresponding end of the dehydration tube 7, so as to obtain a combination of the positioning tube 8 and the dehydration tube 7;

[0062] Use the flexible steel wire rope 6 to penetrate into 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 falls into the end of the link 5 connected to the free surface of the goaf 2, use a tool to hook the flexible steel wire rope 6 into the link 5, and use the flexible steel wire rope 6 to tie and fix the positioning pipe 8 and the dehydration pipe 7 combination in the link 5 in an area 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 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] Among them, the gauze can be a gauze of a conventional mesh number. Generally speaking, after the steel wire mesh is wound and rolled, it is stretched in the axial direction, that is, it is wound in a spiral manner, so that it can be wound into a continuous steel wire tube. Among them, in order to avoid the looseness of the wound steel wire tube, the steel wire tube needs to be bound on the outer wall by iron wire before winding the gauze, and 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 tube 8 and the dehydration tube 7 is all operated in the link 5, which can effectively prevent personnel from entering the goaf 2 for operation, reduce the construction difficulty and operation risk, and ensure the personal safety of construction personnel.

[0065] In some embodiments, in the step 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, when constructing the filling retaining wall 10, a movable hole is 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 gap between the back-filling feed pipe 3, the positioning pipe 8 and the dehydration pipe 7 and the filling retaining wall 10 can be blocked by cement mortar or filling sandbags. In the present application, the blocking method of sandbags is preferably adopted, and such a design can also play a role of 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 needs to be continuously intermittently poured until the filling slurry overflows, in order to ensure that when the filling slurry slowly fills the gaps on the roof 9 in the goaf 2, there is still enough filling slurry to replenish. In addition, the filling method needs to be filled in multiple intervals, so that the filling slurry has enough time to fill the gaps on the roof 9.

[0067] In the above improved embodiment, after the slurry is discharged from one end of the positioning tube 8 in the channel 5, the end of the positioning tube 8 in the channel 5 is first sealed, and then the pressure filling is slowly continued through the backfilling feed pipe 3 until the backfilling feed pipe 3 can no longer be filled with slurry or the filling pressure exceeds the preset pressure value, and then the backfilling feed pipe 3 is sealed to complete the filling work. Among them, the height of the filling slurry will decrease as the dehydration continues, so it is necessary to slowly backfill multiple times, the purpose of which is mainly to ensure that the filling slurry can be successfully connected with the top plate 9.

[0068] The roof filling construction method of the top pillar mining field of this underground mine provides on-site conditions for subsequent filling construction by rationally planning the mining layout of the top pillar mining field. The through hole and the filling auxiliary hole 4 are constructed in advance in the drilling stage. The function of the through hole is to penetrate the upper channel 11 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 mining field and low filling connection. The roof filling construction method of the top pillar mining field 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 top pillar filling.

[0069] The above-mentioned 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 substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A method for roof filling construction of underground mine top pillar stope, characterized in that: The following steps are involved: Construction of main feed inlet: planning the mining plan according to the top pillar mining site conditions and determining and constructing the main feed inlet; 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 mining field far from the main feeding 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 with 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 end of the flexible steel wire rope to the end of the back-filling feed pipe at 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 to a height higher than the bottom of the filling auxiliary hole, and fix the back-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, the end of the positioning pipe extending outwards should be at least 0.2m longer than the corresponding end of the dewatering pipe, and the dewatering pipe should be hoisted by using the reverse-filling feed pipe hoisting method until the end of the positioning pipe being pulled is flush with the roof in the goaf, and the positioning pipe and dewatering pipe are fixed; Construction of backfill retaining wall: construct a 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 all pass through the backfill retaining wall and are 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 then 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 top pillar stope of an underground mine according to claim 1, characterized in that: The steps of constructing the backfill feed pipe specifically include the following steps: When the mining preparation project of the top pillar stope is completed, a filling auxiliary hole is constructed from bottom to top in the lower connecting channel of the top pillar stope far from the main feed inlet and close to the goaf, in a direction inclined toward the top of the goaf. The filling auxiliary hole is located on one side of the diagonal area of ​​the main feed inlet; the bottom of the filling auxiliary 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 droops 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 fix the back-filling feed pipe in the joint at least 1m away from the end; Pull the flexible steel wire rope in the channel to drive the end of the back-filling feed pipe to be gradually lifted up until the binding point of the flexible steel wire rope and the back-filling feed pipe rises to the bottom of the filling auxiliary hole, stop pulling the flexible steel wire rope, and fix the back-filling feed pipe.

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

4. A method for roof filling construction of a mountain pillar stope in an underground mine according to claim 1 or 2, characterized in that: The projection of the filling auxiliary hole in the horizontal direction coincides with the direction of the connecting channel.

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 main feed port specifically include the following steps: Plan the mining plan of the entire top pillar stope according to the situation of the top pillar stope, and pre-form the rock drilling roadway and the connecting road connected to the rock drilling roadway during the mining process of the top pillar stope; A number of 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.

6. The method for roof filling construction of a top pillar stope of 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: The steel wire mesh is rolled into a circular steel wire tube with a diameter of 0.18-0.22m, and then the gauze is wrapped around the outside of the steel wire tube and the gauze is tied and fixed on the steel wire tube with a binding tape. 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 extending outward is at least 0.2 m longer than the end of the corresponding end of the dehydration pipe, so as 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 connected to the free surface of the goaf, use a tool to hook the flexible steel wire rope into the joint, and use the flexible steel wire rope to tie and fix the positioning pipe and dehydration pipe combination in the joint at least 1m away from the end; 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.

7. The method for roof filling construction of a top pillar stope of an underground mine according to claim 6, 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.

8. The method for roof filling construction of a top pillar stope of an underground mine according to claim 1, characterized in that: In the steps 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.

9. The method for roof filling construction of a top pillar stope of an underground mine according to claim 1, characterized in that: 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.

10. The method for roof filling construction of underground mine top pillar stope 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.

Images