A filling method for the thick coal seam layered mining working face to pass through the old roadway of the lower layer

Abstract

The invention discloses a method for filling a lower slice old working roadway when a thick coal seam slicing working face passes through the lower slice old working roadway. The method comprises the following steps (1) a slice position relation arrangement diagram of the lower slice old working roadway and an upper slice working surface is drawn, wherein the position of the lower slice old working roadway and the position relation between the lower slice old working roadway and the upper slice working surface are marked in detail; (2) a filing roadway is arranged, wherein a coal roadway which is parallel to the long axis of the lower slice old working roadway is excavated along a top plate of the upper slice working surface and used as the filling roadway; (3) the lower slice old working roadway is sealed; (4) a peeping drill hole and a filling drill hole are arranged; (5) the lower slice old working roadway is filled, wherein filling materials are injected through a filling pipe, the lower slice old working roadway is filled in sequence from the lower end to the upper end, and the filling effect is observed in real time through a drill hole peeping instrument via the peeing drill hole in the filling process. Compared with the prior art, the method has the advantages that the filling roadway is arranged, so that the phenomenon of incompact filling caused by the situation that the filling materials are solidified early and block part of space inside the lower slice old working roadway is effectively eliminated, and the lower slice old working roadway filling effect is improved.

Description

technical field [0001] The invention relates to the field of layered mining of thick coal seams, in particular to a method for filling an old roadway through a lower layer in a layered mining face of a thick coal seam, especially for an old roadway with a lower layer where there is a high risk area. Background technique [0002] Layered mining of thick coal seams can effectively solve the problem of roof support and goaf treatment in thick coal seam mining, which is conducive to realizing safe production under such coal seam conditions, improving resource recovery rate and obtaining better coal mining work Surface technical and economic indicators. At present, thick coal seam layered mining has mature experience in coal mining technology, roadway layout and working face technical management in my country. [0003] Shanxi Province is rich in coal resources and thick coal seams are widely distributed. However, the disorderly mining of thousands of small coal mines has caused ...

AI Technical Summary

Problems solved by technology

[0004] Due to the unreasonable mining planning of private small coal mines in the past, and the backward high-drop mining method, there are a large number of old lanes and high-drop damage areas in these thick coal seams, and there are basically no whole blocks of resources.

With the integration of coal resources in Shanxi Province in recent years, the traditional small private coal mines have been eliminated, making them resource-integrated mines. The equipment on the surface limits the height of coal seam mining, and the cost of purchasing advanced fully mechanized mining equipment with large mining heights is too high) to achieve full height mining at one time. Therefore, these resource-integrated mines generally adopt the downward layered mining method to mine thick coal seams. In the process of layered mining of thick coal seams in the coal mining face, due to the existence of a large number of lower layered old roads and high-fall damage areas, when the upper layered working face advances above the lower layered old roadway, if the lower layered layer is not properly The filling treatment of the old roadway will cause ground pressure to appear, roof to fall, and support to sink, causing safety accidents and causing the upper stratified working face to fail to advance normally.

In the past, the method of passing through the old alleys of the lower stratification basically relied on the method of moving and reversing, which required a large number of protective coal pillars, resulting in a large loss of coal resources

In addition, due to the long-term disrepair of the lower layered old alley, there are safety hazards such as gas accumulation, roof collapse, and old empty water, which restrict safe production and make it difficult to achieve safe recovery of the entire resource. The upper and lower layered working faces cannot be recovered normally, and frequent It takes up a lot of production time and increases mining costs, which seriously threatens the safe production of coal mines, and at the same time reduces the recovery rate and recovery efficiency of coal resources.

[0005] Filling the old roadway with lower stratification can solve the above-mentioned problem of the impact of the old roadway with lower stratification on mining to a certain extent, but the traditional filling method for old roadway with lower stratification has the problem of inaccurate filling of the old roadway with lower stratification

The main reasons are: most of the old lanes in the lower strata are in disrepair for a long time, the support is invalid, there are a large number of high-falling damaged areas, and the falling gangue 13 is accumulated in the old lanes in the lower strata. When the traditional filling method is adopted, the filling material 7 is the natural The fluid flows along the direction A in the figure, and fills the old roadway in the lower layer by the flow potential energy. The caving and accumulated gangue greatly reduces the fluidity of the filling slurry, causing the filling material to appear early setting phenomenon, forming the filling area 9, causing the lower subdivision The layered old alley is partially blocked, and it is no longer possible to fill the lower space of the old alley and the high risk area, and an unfilled area 10 appears, resulting in poor overall filling effect of the old alley in the lower layer, such as figure 1 shown

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