CN115478893A - A grouting filling method for gobs and separation layers in fully mechanized mining face - Google Patents

Abstract

The invention provides a grouting filling method for a gob and a separation layer of a fully mechanized mining working surface, which comprises the following grouting steps during grouting: a, injecting large-particle paste into a goaf along a first grouting pipeline by using self weight to form a filling body; b, injecting the large-particle paste into the goaf along a second grouting pipeline by using self weight, and simultaneously injecting the slurry into the goaf in a first grouting pipeline by using grouting pressure until a top plate fracture zone is full; c, injecting clear water into the first grouting pipeline, cleaning the grouting pipeline, increasing the grouting pressure of the first grouting pipeline, and injecting grout into the delamination zone until the delamination zone is full; and repeating the grouting steps for the subsequent grouting pipeline along with the advancing of the working surface. The method can sequentially complete grouting of the separation layer while grouting the goaf, and the pipes are sequentially carried out, so that a set of ordered filling process is formed.

Description

A grouting filling method for gobs and separation layers in fully mechanized mining face

technical field

The invention belongs to the technical field of grouting filling in coal mines, and in particular relates to a grouting filling method for collecting goafs and separation layers in fully mechanized mining working faces.

Background technique

In recent years, more and more mines have been mined in the fully mechanized mining face, but the filling process of the working face has become more stringent, and there is no matching filling process corresponding to it, which affects the production of the working face efficiency. Under the background of protecting the ecological environment and ground construction, the filling requirements of mines are becoming higher and higher. Under the premise of ensuring safe production, the effect of filling is becoming more and more stringent. This further makes the filling process more difficult and the cost increases dramatically.

Moreover, the current filling process of the fully mechanized mining face does not take into account the gaps in the separation zone, and the separation zone will gradually sink as time goes by. The traditional filling process of the fully mechanized mining face has a great impact on the normal production of the fully mechanized mining operation area, resulting in a decrease in coal production efficiency.

Contents of the invention

In order to solve the technical problems existing in the prior art, the present invention proposes a grouting filling method for collecting the goaf and separation layer in the fully mechanized mining face. This method can be completed in an orderly manner while grouting the goaf. For the grouting of the separation layer, the pipes are carried out in an orderly manner, forming a set of orderly filling process.

A grouting filling method for gobs and separated layers in a fully mechanized mining face, comprising, before arranging grouting pipelines, determining the distance from the roof of the coal seam to the surface and the damage range of the separated layers;

From the cut hole, the working face advances L meters for the first time, and drills from the ground to the gob roof at a distance of R meters from the cut hole, and arranges the grouting pipeline. The distance of a single row of drilling holes is 2R; meters, that is, drill holes from the ground to arrange grouting pipelines;

L is the safety distance, where L is the distance between the cutting eye and the fully mechanized mining operation area, or the distance between the filling surface that has been filled with grouting and the fully mechanized mining operation area; R is the radius of grouting, and S is the distance affected by grouting diffusion; 2R+S+VT≤L, V is the mining speed of the working face, and T is the mining time. ;

The grouting pipeline arranged in the borehole is provided with a plurality of grouting holes at positions corresponding to the separation zone;

When performing grouting, it includes the following grouting steps: a. inject the large-grained paste into the gob by its own weight along the first grouting pipe to form a filling body; b. utilize the large-grained paste along the second grouting pipe. Inject the goaf by gravity, and at the same time, use the grouting pressure to inject the grout into the gob in the first grouting pipe until the roof fissure zone is full; c inject clear water into the first grouting pipe, and carry out Clean, then increase the grouting pressure of the first grouting pipe, and inject the grout into the separation zone until the separation zone is full; as the working face advances, repeat the above grouting steps for the subsequent grouting pipelines.

Further, the damage range of the detached layer is determined by microseismic method or drilling method.

Further, the length of the grouting pipeline is determined according to the distance from the top plate to the ground surface, and the range of the grouting outlet of the grouting pipeline is determined by the damage range of the separation layer.

Further, in the process of grouting and working face mining, it is necessary to ensure that the distance between the grouting pipeline and the fully mechanized mining operation area is L meters.

Further, the grouting radius R is directly proportional to the drilling depth, gob height and grouting pressure, and inversely proportional to the drilling angle.

Further, a plurality of grouting holes provided at positions corresponding to the grouting pipeline and the separation zone are uniformly arranged along the pipe wall of the grouting pipeline.

Further, the particle size of the large-grain paste is below 15 mm, which is determined by the size of the goaf.

Further, the grouting pressure is 0.5MPa to 3MPa.

The invention utilizes the goaf grouting pipeline to simultaneously complete the grouting of the detached layer, and a set of grouting device completes the grouting process in the two areas, which minimizes the impact of the grouting filling operation on the normal production of the fully mechanized mining work area. The impact of coal production is guaranteed, and at the same time, production costs and time costs are saved.

Description of drawings

Fig. 1 is a schematic diagram of the grouting filling method for gobs and separated layers in fully mechanized mining face of the present invention.

detailed description

In order to solve the technical problems existing in the prior art, the present invention proposes a grouting filling method for collecting the goaf and separation layer in the fully mechanized mining face. This method can be completed in an orderly manner while grouting the goaf. For the grouting of the separation layer, the pipes are carried out in an orderly manner, forming a set of orderly filling process. The present invention will now be described in conjunction with FIG. 1 .

A method for grouting filling of gobs and separation layers in a fully mechanized mining face, comprising, before arranging grouting pipelines, determining the distance from the coal seam roof to the ground surface and the damage range of separation layers, so as to arrange the grouting pipelines subsequently;

From the cutout, the working face advances L meters for the first time, and drills from the ground to the goaf roof at a distance of R meters from the cutout, and arranges the grouting pipeline. The distance of a single row of drilling holes is 2R to ensure that the grouting slurry Covering the entire area; every 2R meters in the follow-up working face, drill holes from the ground to arrange grouting pipelines;

L is the safety distance, where L is the distance between the cutting eye and the fully mechanized mining operation area, or the distance between the filling surface that has been filled with grouting and the fully mechanized mining operation area; R is the radius of grouting, and S is the distance affected by grouting diffusion; 2R+S+VT≤L, V is the mining speed of the working face, and T is the mining time. ;

The grouting pipeline arranged in the borehole is provided with a plurality of grouting holes at positions corresponding to the separation zone;

When performing grouting, it includes the following grouting steps: a. inject the large-grained paste into the gob by its own weight along the first grouting pipe to form a filling body; b. utilize the large-grained paste along the second grouting pipe. Inject the goaf by gravity, and at the same time, use the grouting pressure to inject the grout into the gob in the first grouting pipe until the roof fissure zone is full; c inject clear water into the first grouting pipe, and carry out Clean, then increase the grouting pressure of the first grouting pipe, and inject the grout into the separation zone until the separation zone is full; as the working face advances, repeat the above grouting steps for the subsequent grouting pipelines. Because the gap between the abscission zone may be relatively small, it is necessary to increase the grouting pressure so that the grout can fill the abscission zone after the goaf is filled. When the grouting pressure reaches a certain value, the grout cannot be injected again. The separation zone is filled with slurry.

Wherein, the damage range of the detached layer is determined by the microseismic method or the drilling method. The length of the grouting pipeline is determined according to the distance from the top plate to the ground surface, and the range of the grouting outlet of the grouting pipeline is determined by the damage range of the separation layer, so as to inject grout into the separation layer zone.

Among them, in the process of grouting and working face mining, it is necessary to ensure that the distance between the grouting pipeline and the fully mechanized mining operation area is L meters. The slurry filling space is relatively separated to minimize the impact on coal production. The grouting radius R is proportional to the drilling depth, gob height and grouting pressure, and inversely proportional to the drilling angle. A plurality of grouting holes provided at positions corresponding to the grouting pipeline and the separation zone are evenly arranged along the pipe wall of the grouting pipeline. The particle size of the large particle paste is below 15mm, which is determined by the size of the goaf. The grouting pressure is 0.5MPa to 3MPa.

The invention utilizes the goaf grouting pipeline to simultaneously complete the grouting of the detached layer, and a set of grouting device completes the grouting process in the two areas, which minimizes the impact of the grouting filling operation on the normal production of the fully mechanized mining work area. The impact of coal production is guaranteed, and at the same time, production costs and time costs are saved.

Claims (8)

1. A kind of grouting filling method of fully mechanized mining face goaf and separation layer, comprising, before arranging the grouting pipeline, determine the distance from the coal seam roof to the ground surface and the damage range of the separation layer; From the cut hole, the working face advances L meters for the first time, and drills from the ground to the gob roof at a distance of R meters from the cut hole, and arranges the grouting pipeline. The distance of a single row of drilling holes is 2R; meters, that is, drill holes from the ground to arrange grouting pipelines; L is the safety distance, where L is the distance between the cutting eye and the fully mechanized mining operation area, or the distance between the filling surface that has been filled with grouting and the fully mechanized mining operation area; R is the radius of grouting, and S is the distance affected by grouting diffusion; 2R+S+VT≤L, V is the mining speed of the working face, and T is the mining time; The grouting pipeline arranged in the borehole is provided with a plurality of grouting holes at positions corresponding to the separation zone; When performing grouting, it includes the following grouting steps: a. inject the large-grained paste into the gob by its own weight along the first grouting pipe to form a filling body; b. utilize the large-grained paste along the second grouting pipe. Inject the goaf by gravity, and at the same time, use the grouting pressure to inject the grout into the gob in the first grouting pipe until the roof fissure zone is full; c inject clear water into the first grouting pipe, and carry out Clean, then increase the grouting pressure of the first grouting pipe, and inject the grout into the separation zone until the separation zone is full; as the working face advances, repeat the above grouting steps for the subsequent grouting pipelines. 2. The grouting filling method for a fully mechanized mining face goaf and separation layer according to claim 1, characterized in that the damage range of the separation layer is determined by microseismic method or drilling method. 3. the grouting filling method of a kind of fully mechanized mining face goaf and separation layer according to claim 1, is characterized in that, the length of grouting pipeline is determined according to the distance from top plate to ground surface, and grouting pipeline grouting The range of the mouth is determined by the damage range of the abscission layer. 4. A kind of grouting filling method for collecting fully mechanized mining face goaf and separation layer according to claim 1, characterized in that, in the process of grouting and working face mining, it is necessary to ensure that the grouting pipeline and the fully mechanized mining operation The distance of the zone is in L meters. 5. the grouting filling method of a kind of fully-mechanized mining face goaf and separation layer according to claim 1, is characterized in that, the grouting radius R is related to drilling depth, goaf height and grouting pressure Proportional to and inversely proportional to the drilling angle. 6. The grouting filling method of a kind of fully-mechanized mining face goaf and separation layer according to claim 3, characterized in that, a plurality of grouting pipes are provided at positions corresponding to the separation layer zone The holes are evenly arranged along the pipe wall of the grouting pipe. 7. A kind of grouting filling method for collecting fully mechanized mining face goaf and separation layer according to claim 1, characterized in that, the particle diameter of the large particle paste is below 15mm, determined by the size of the goaf . 8. A grouting filling method for collecting gobs and separation layers in fully mechanized mining face according to claim 1, characterized in that the grouting pressure is 0.5MPa to 3MPa.

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