Multi-point drainage filling method for underground goaf

Abstract

The invention relates to the technical field of underground goaf treatment, in particular to an underground goaf multi-point drainage filling method which comprises the following steps that S1, a first drilling machine is used for conducting construction of a plurality of horizontal filling holes in the inner wall of a transverse drift, the distance between every two adjacent filling holes is kept consistent, and multi-point communication of the transverse drift and the goaf is achieved; s2, a second drilling machine and a well drill are simultaneously and sequentially used for carrying out construction of an inclined drainage hole and a vertical shaft on the rock layer, so that the inclined drainage hole is communicated with the goaf, then a water filtering pipeline is installed at the bottom of the inclined drainage hole, and a drainage gate valve is arranged between the inclined drainage hole and the water filtering pipeline. The goaf is subjected to multi-point filling and water filtering and draining operation, so that the strength distribution of a filling body in a stope is more uniform, the safety of two-step stoping of a mine is improved, the flowing distance of filling slurry in a chamber is reduced, accumulated water in the stope is conveniently and timely emptied, and the uniform distribution of coarse and fine particles of the slurry in the stope is realized; and the non-uniform strength distribution phenomenon of the filling body is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground goaf treatment, in particular to a multi-point drainage filling method for underground goaf. BACKGROUND

[0002] When filling the underground goaf of most mines, filling holes are arranged in the filling roadway to realize filling of the stope, and the goaf without the filling roadway is often filled by using a single-point distribution method, which may cause segregation and stratification of the filling slurry during flow, mainly manifested as a trend that the particle size of the filling body material increases first and then decreases along the flow direction of the slurry.

[0003] The strength of the filling body is affected by the stratification and segregation of the filling slurry, which may cause uneven distribution, and when the length of the mine chamber is short, the degree of stratification and segregation is small, but the length of the middle stope is generally more than 100m, and the degree of stratification and segregation is more serious when the single-point distribution filling method is used, which is mainly manifested as that the filling body far from the feeding point is easily affected by the blasting vibration when the adjacent two-step mine chamber is blasted, thereby causing collapse, and when the surrounding rock fissure is not developed during the continuous filling of the high-stage mine chamber, the water separated from the filling slurry cannot be discharged in time, which may cause the slurry to be diluted by the upper accumulated water during subsequent filling, and the strength of the filling body may not meet the standard. SUMMARY

[0004] The present application aims to provide a multi-point drainage filling method for underground goaf, which can solve the problems of the above background technology, i.e., the stratification and segregation of the filling method using a single-point distribution are more serious, which may cause uneven distribution of the strength of the filling body, and when the high-stage mine chamber is continuously filled, the water separated from the filling slurry cannot be discharged in time, the slurry is diluted by the upper accumulated water, and the strength of the filling body may not meet the standard.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a multi-point drainage filling method for underground goaf, comprising the following steps:

[0006] S1: using a first drilling machine to construct a plurality of horizontal filling holes on the inner wall of the through vein, the interval between every two adjacent filling holes being kept consistent, to realize multi-point communication between the through vein and the goaf;

[0007] S2: simultaneously using a second drilling machine and a drilling machine to construct a slanting drainage hole and a vertical shaft in the rock layer, so that the slanting drainage hole is communicated with the goaf, then installing a filter water pipeline at the bottom of the slanting drainage hole, and setting a drainage gate valve between the slanting drainage hole and the filter water pipeline;

[0008] S3: respectively laying filling branch pipes and filling main pipes in the filling holes and the vein, connecting the filling main pipes with the filling branch pipes, building a material station on the ground of the mining area, mixing the fine tailings, concrete and dry powder mortar in the material station according to the proportion to form mixed grouting material, and conveying the mixed grouting material into the goaf through the filling main pipes and the filling branch pipes by using a grouting pump;

[0009] S4: switching the material conveying of the filling branch pipes by using the grouting gate valves to realize the uniform rising of the material level of the mixed grouting material in the goaf, and filtering the water in the rising state through the filter pipeline while the water in the goaf gradually rises with the uniform injection of the mixed grouting material;

[0010] S5: when the water level rises to the bottom of the inclined drainage hole, the water filtered by the filter pipeline can be conveyed under the guidance of the inclined drainage hole by opening the drainage gate valve, so as to stably remove the accumulated water in the goaf, and the degree of water removal can be determined by monitoring the height of the mixed grouting material in the inclined drainage hole.

[0011] Preferably, the plurality of filling holes are linearly arranged along the center line of the vein, and the plurality of filling holes are arranged in parallel and perpendicular to the center line of the vein.

[0012] Preferably, the vein is connected with the goaf through the plurality of filling holes, and the diameter of the filling hole is 165-175 mm.

[0013] Preferably, the filling branch pipe is inserted into the inner side of the filling hole, the filling main pipe is connected with the plurality of filling branch pipes, and the connection part of the filling main pipe and the plurality of filling branch pipes is provided with a grouting gate valve.

[0014] Preferably, the proportion of the fine tailings, concrete and dry powder mortar in the mixed grouting material is 6:1.5:2.

[0015] Preferably, the models of the first drilling machine and the second drilling machine are T150 and T100 respectively.

[0016] Preferably, the inclined drainage hole and the filter pipeline form a drainage channel, the vertical shaft is connected with the goaf through the drainage channel, the drainage gate valve is used to control the opening and closing of the drainage channel, and the inclined drainage hole and the filter pipeline are connected through the drainage gate valve.

[0017] Preferably, the upper part of the vertical shaft is provided with a water pump, the inner side of the vertical shaft is fixedly provided with a drainage pipe, and the input end of the water pump is connected with the inclined drainage hole through the drainage pipe.

[0018] Preferably, the filter pipeline is arranged on the inner side of the goaf, and the surface of the filter pipeline is provided with a plurality of filter holes.

[0019] Preferably, the outer side of the water filtering pipeline is sleeved with spiral blades, which are coaxial with the water filtering pipeline and rotate in the outer side of the water filtering pipeline.

[0020] Compared with the prior art, the present application has the following advantages:

[0021] 1、The present application adopts multi-point filling grouting material and synchronous filtering and draining operation in the goaf, uniformly constructs multi-point filling drilling holes in the length direction of the penetrating pulse, facilitates the uniform rising of the grouting material in the mine chamber, thereby reducing the distance of the slurry flow, and constructs an inclined drainage hole in the upper part of the goaf, controls the filling speed when the internal water in the stope reaches the bottom position of the inclined drainage hole, and then discharges the slurry through the inclined drainage hole, and then seals the inclined drainage hole, which is convenient to operate, easy to construct, small investment, high return, makes the strength distribution of the filling body in the stope more uniform, and improves the safety of the two-step mining of the mine.

[0022] 2、The present application can timely and fully drain the water in the stope, so that the coarse and fine particles of the slurry in the stope are uniformly distributed, the phenomenon of uneven distribution of the filling body strength is reduced, the filling body mixed with ore due to blasting vibration in the two-step mining process is obviously reduced, the stability of the filling body is further improved, the phenomena of segregation due to single-point distribution and water accumulation in the goaf cannot be timely drained in the process of filling the mine without filling roadway are reduced, thereby reducing the phenomena of substandard filling body strength and uneven distribution. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The present application is a filling hole construction profile schematic diagram.

[0024] Figure 2 The present application is a filling hole construction profile schematic diagram.

[0025] Figure 3 The present application is an inclined drainage hole structure schematic diagram.

[0026] Figure 4 The present application is a single-point filling slurry trajectory schematic diagram.

[0027] Figure 5 The present application is a whole construction flowchart. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all.

[0029] Please refer to Figures 1 to 5The application provides a kind of embodiment: a kind of goaf multi-point drainage filling method under well, comprising the following steps:

[0030] S1: using the first drilling machine is carried out in the wall of the vein, multiple horizontal filling hole construction, every two adjacent filling hole interval is kept consistent, realizes to the vein and goaf multiple point communication;

[0031] S2: simultaneously using second drilling machine and drilling machine is carried out in the rock layer, inclined drainage hole and shaft construction, so that inclined drainage hole and goaf communication, then installs filter water pipeline in the bottom of inclined drainage hole, and sets up drainage gate valve between inclined drainage hole and filter water pipeline;

[0032] S3: in filling hole and vein respectively, filling branch pipe and filling main pipe are laid, and filling main pipe is connected with multiple filling branch pipes, and material station is built on the ground in mining area, and fine particle tailing material, concrete and dry powder mortar are mixed in proportion to form mixed grouting material in material station, and mixed grouting material is transported into goaf by grouting pump through filling main pipe and filling branch pipe;

[0033] S4: using grouting gate valve, multiple filling branch pipes are switched, and the level of mixed grouting material in goaf is uniformly raised, when water in goaf can be gradually raised with the uniform injection of mixed grouting material, and the water in rising state is filtered through filter water pipeline;

[0034] S5: when water level rises to the bottom of inclined drainage hole, the water filtered by filter water pipeline can be transported under the guidance of inclined drainage hole by opening drainage gate valve, so as to stably remove the accumulated water in goaf, and the degree of water removal can be determined by monitoring the height of mixed grouting material in inclined drainage hole.

[0035] Please refer to Figure 1 And Figure 2 , the model of the first drilling machine and the second drilling machine is T150 and T100 respectively, multiple filling holes are linearly arranged along the center line of the vein, multiple filling holes are arranged in parallel and perpendicular to the center line of the vein, the vein and the goaf are connected through multiple filling holes, the diameter of the filling hole is 165-175mm, the filling branch pipe is inserted into the inside of the filling hole, the filling main pipe is connected with multiple filling branch pipes, grouting gate valves are arranged at the connection between the filling main pipe and multiple filling branch pipes, the proportion of fine particle tailing material, concrete and dry powder mortar in mixed grouting material is 6:1.5:2, the level of mixed grouting material in goaf can be uniformly raised by switching multiple filling branch pipes through grouting gate valve, and the distance of slurry flow is reduced.

[0036] Please refer to Figure 3The inclined water outlet hole and the filter water pipeline form a water outlet channel, the shaft and the goaf are connected through the water outlet channel, the water outlet gate valve is used for controlling the opening and closing of the water outlet channel, the inclined water outlet hole and the filter water pipeline are connected through the water outlet gate valve, the upper part of the shaft is provided with a water pump, the inner side of the shaft is fixedly provided with a drain pipe, and the input end of the water pump is connected with the inclined water outlet hole through the drain pipe, so that the water pump can timely and fully drain the accumulated water in the stope through the water pump, the water outlet gate valve, the inclined water outlet hole and the filter water channel, the coarse and fine particles of the slurry in the stope are uniformly distributed, and the uneven strength distribution of the filling body is reduced.

[0037] The filter water pipeline is arranged on the inner side of the goaf, the surface of the filter water pipeline is provided with a plurality of filter water holes, the outer side of the filter water pipeline is sleeved with a spiral blade, the spiral blade is coaxial with the filter water pipeline and rotates directionally on the outer side of the filter water pipeline, so that when the accumulated water is filtered through the filter water holes in the filter water channel, the spiral blade is affected by the flow of the accumulated water and rotates to continuously scrape the surface of the filter water pipeline, and the filter water holes are prevented from being blocked.

[0038] It will be obvious to a person skilled in the art that, without departing from the spirit or essential characteristics of the application, the present application can be implemented in other specific forms. The present examples are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the description given above, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the scope of the claims.

Claims

1. A method for multi-point drainage and backfilling of underground goaf areas, characterized in that, Includes the following steps: S1: The first drilling rig is used to construct multiple horizontal filling holes on the inner wall of the vein. The spacing between each pair of adjacent filling holes is kept consistent, so as to achieve multi-point connection between the vein and the goaf. S2: Simultaneously, the second drilling rig and the drilling rig are used to construct the inclined drainage hole and the vertical shaft in the rock layer, so that the inclined drainage hole is connected to the goaf area. Then, a filter pipe is installed at the bottom of the inclined drainage hole, and a drainage gate valve is set between the inclined drainage hole and the filter pipe. S3: Lay filling branch pipes and filling main pipes in the filling holes and through veins respectively, and connect the filling main pipes to multiple filling branch pipes. Construct a material station on the ground in the mining area. Through the material station, fine-grained tailings, concrete and dry mortar are mixed in proportion to form mixed grouting material. The mixed grouting material is then transported to the goaf area through the filling main pipe and filling branch pipes by the grouting pump. S4: The grouting gate valve is used to switch the material conveying of multiple filling branch pipes in sequence to achieve a uniform rise in the level of the mixed grouting material in the goaf. At this time, the water in the goaf can gradually rise as the mixed grouting material is injected evenly, and the rising water is filtered through the water filter pipe. S5: When the water level rises to the bottom of the inclined drainage hole, the water filtered by the filter pipe can be transported under the guidance of the inclined drainage hole by opening the drainage gate valve, thereby stably removing the water accumulated in the goaf. The degree of water removal can be determined by monitoring the height of the mixed grouting material in the inclined drainage hole.

2. The method for multi-point drainage and backfilling of underground goaf areas according to claim 1, characterized in that: The plurality of filling holes are arranged linearly along the center line of the perforating vein, and the plurality of filling holes are arranged in parallel and perpendicular to the center line of the perforating vein.

3. A method for multi-point drainage and filling of underground goaf areas according to claim 2, characterized in that: The perforated vein and the goaf are connected by multiple filling holes, the diameter of which is 165-175mm.

4. A method for multi-point drainage and filling of underground goaf areas according to claim 3, characterized in that: The filling branch pipe is inserted into the inside of the filling hole. The filling main pipe is connected to and fixedly connected to multiple filling branch pipes. A grouting gate valve is provided at the connection between the filling main pipe and the multiple filling branch pipes.

5. A method for multi-point drainage and filling of underground goaf areas according to claim 1, characterized in that: The ratio of fine-grained tailings, concrete, and dry mortar in the mixed grouting material is 6:1.5:

2.

6. A method for multi-point drainage and filling of underground goaf areas according to claim 1, characterized in that: The first drilling rig and the second drilling rig are model T150 and T100, respectively.

7. A method for multi-point drainage and backfilling of underground goaf areas according to claim 1, characterized in that: The inclined drainage hole and the filter pipe form a drainage channel. The vertical shaft and the goaf are connected through the drainage channel. The drainage gate valve is used to control the opening and closing of the drainage channel. The inclined drainage hole and the filter pipe are connected through the drainage gate valve.

8. A method for multi-point drainage and backfilling of underground goaf areas according to claim 7, characterized in that: A water pump is installed at the top of the shaft, and a drain pipe is fixedly installed on the inner side of the shaft. The input end of the water pump is connected to the inclined drain hole through the drain pipe.

9. A method for multi-point drainage and filling of underground goaf areas according to claim 8, characterized in that: The water filter pipe is located inside the goaf area, and the surface of the water filter pipe is provided with multiple water filter holes.

10. A method for multi-point drainage and backfilling of underground goaf areas according to claim 9, characterized in that: A spiral blade is fitted onto the outer side of the water filter pipe. The spiral blade is coaxial with the water filter pipe and rotates directionally on the outer side of the water filter pipe.

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