Stability Analysis Method for Upward Mining of Shallow Buried and Near-distance Room-and-Pillar Goaf

Abstract

The invention discloses a method for analyzing the stability of rock strata in upward mining in a shallow-buried short-distance room-pillar goaf, which is characterized in that it comprises the following steps: step 1, constructing a box girder bridge model; step 2, determining the basic parameters of the box girder The third step is to analyze the stability of the box girder bridge according to the structural characteristics of the box girder bridge, including: the judgment of the stability of the web plate of the box girder bridge structure and the judgment of the stability of the room column. According to the existing mechanical theory and mine pressure theory, the present invention conducts mechanical analysis and research on the upward mining system of the shallow-buried and close-distance room-and-pillar goaf according to the structural model of the box-girder bridge, ensuring that the shallow-buried and close-distance room-and-pillar mining The scientificity, practicability and rationality of determining the stability parameters of the goaf upward mining system.

Description

technical field [0001] The invention belongs to the technical field of coal mine mining, and in particular relates to a method for analyzing the stability of rock strata in upward mining in a shallow-buried short-distance room-pillar goaf. Background technique [0002] Shallow coal seams are generally buried less than 150 meters deep. The characteristics of thin bedrock, shallow burial, and overlying thick loose layers make it difficult to form traditional theoretical cantilever beams and masonry structures in the mining process of close-distance coal seam groups. Stable load-bearing structures such as body beams and transfer rock beams. The existing research on the activity law of the overlying strata has done a lot of meaningful research on the overlying strata activity law through the combination of theoretical calculation and various monitoring methods, but the upward fully mechanized mining face in the room-and-pillar goaf However, there are few related studies on the ...

AI Technical Summary

Problems solved by technology

The existing research on the activity law of the overlying strata has done a lot of meaningful research on the overlying strata activity law through the combination of theoretical calculation and various monitoring methods, but the upward fully mechanized mining face in the room-and-pillar goaf However, there are few relevant studies on the influence of mine pressure appearance law on the stability of the entire mining system.

Due to the influence of the stability of the coal pillar and overlying rock during the upward mining of the room-and-pillar goaf, for the sake of safety, the length design of many fully mechanized mining faces in Shenfu mining area is only about 80m, and the length design of fully mechanized mining faces lacks safe and reasonable science. According to the basis, the relocation is too frequent, which increases the mining cost and the labor intensity of the staff, and consumes a lot of manpower, material resources and time

In addition, there are many coal pillars left, which reduces the resource recovery rate. A reliable and effective analysis method for the stability of upward mining rock formations in shallow buried and close-distance room-and-pillar goafs has become a major problem that needs to be solved urgently.

Images