千秋煤矿冲击地压发生特点及成因分析

Analysis on Occurrence Characteristics and Causes of Rock Burst in Qianqiu Coal Mine

在对千秋煤矿冲击地压发生特点进行分析的基础上,研究煤矿地质因素和开采技术因素对冲击地压形成的影响。煤层具有冲击倾向性且采深达到冲击地压频发的临界深度、水平构造应力增加冲击危险性、覆岩存在厚硬岩层,是冲击地压形成的地质因素和内在因素。下巷位于工作面跳采形成孤岛高应力区的中间位置,且巷道较工作面支护强度薄弱,是下巷易发生冲击地压的开采技术因素和诱发因素。研究结果表明下巷采掘过程中形成的高应力集中是诱发冲击地压的最主要因素。

Based on the analysis on the occurrence characteristics of rock burst in Qianqiu Coal Mine, the influence of geological and mining technology factors on the rock burst formation was studied. The geological and internal causes of rock burst could be that, the coal seam had the out - burst proneness and the mining depth reached the critical depth of rock burst, the risk of rock burst was increased by horizontal tectonic stress, and thick hard rock existed in overlying strata. The technological and inducing factors could be that the transportation roadway was in the middle position of the isolated high stress area, and the supporting intensity of roadway was not enough compared with the mining face. The results show that high stress concentration caused by tunneling and mining is the main cause of rock burst.