孤岛工作面回采期间冲击危险性及防冲要求

Rock burst risk and anti-impact requirements during mining on island working face

由于前期矿井局部区域工作面布置不合理,滥开滥采,在矿井末期孤岛工作面形成应力集中区域已是必然。需要做到尽可能避免应力集中区,合理且有效地进行工作面布置,解决在工作面后期开采期间面临的诸多问题及灾害防治,如冲击地压防治、防灭火等。通过对孤岛工作面冲击地压显现、防治现状及影响因素进行分析,发现区段煤柱、底煤厚度、临近采空区等因素均对工作面开采期间冲击地压的产生有较大影响,对煤岩结构与动力灾害关系均做出危险性分析评价,对孤岛工作面回采期间冲击地压区域防范措施做出明确要求。

Due to the prior unreasonable layout of the working face in some areas of the mine and illegally indiscriminate mining,the formation of the stress concentration area on isolated island faces at the final period of mining is an inevitable outcome.Need to avoid the stress concentration area as much as possible and arrange the working face reasonably and effectively,solve many problems and disaster prevention during the late mining of the working face,such as rock burst prevention,fire prevention and so on,must be addressed.Based on the analysis of the rock burst behavior,prevention status and influential factors on the island working face,we find that the sectional coal pillar,the thickness of bottom coal and the adjacent goaf have great influence on the forming of rock burst during mining.In this paper,the risk analysis and evaluation of the relationship between coal-rock structure and dynamic disasters are carried out,and the locally preventive measures of rock burst during mining on the island working face are proposed.