Impact instability judgment and anti-impact mining method for asymmetric island working face

Abstract

The invention provides an impact instability judgment method for an asymmetric island working face. The impact instability judgment method comprises the following steps of (S1) obtaining the spatial distribution characteristics of overlying strata of the working face, and revealing the control influence of conglomerate on the movement of the overlying strata on the working face through a micro-seismic monitoring result; (S2) dividing the earth surface into three types of areas, analyzing stress transfer rules of overlying strata in different areas to the island working face, and establishing an average bearing pressure estimation model; and (S3) establishing a relation among the equivalent mining depth, the damage degree of the working face and the average bearing pressure of the working face, and judging the possibility of impact instability of the working face according to the relation. The invention further provides an anti-impact mining method for the asymmetric island working face. According to the method, the asymmetric island working face in the condition of the huge thick conglomerate is used as a research object, and the relation among the equivalent mining depth, the damage degree of the working face and the average bearing pressure is put forward and is used as the basis for judging the danger degree of the working face, so that safe mining of the working face is effectively guaranteed.

Description

technical field

[0001] The invention relates to the technical field of coal mining, in particular to an impact instability discrimination and scour prevention mining method of an asymmetric island working face. Background technique

[0002] The space structure of the overlying rock in the island working face is complex, and the concentration of mining stress is high, which can easily cause dangers such as rock burst. The instability of coal mass impact and the dynamic disasters induced by it have gradually become a difficult problem restricting mine safety production. Carrying out the research on the pre-mining impact instability of the island working face is the key to the prediction and prevention of rock burst hazards.

[0003] At present, domestic experts have conducted research on the structural characteristics of the overlying strata, the distribution of stress, and the assessment of impact hazards on the working face of the island, and have achieved fruitful results. ...

Images