冲击地压条件下华亭煤田底板稳定性分析

Floor Stability of Huating Coal Mine Field with Rock Burst

为了研究冲击地压条件下巷道底板的稳定性,通过对华亭煤田底板冲击型冲击地压进行实地监测,发现华亭煤田底板应力受开采活动影响较大;采用中厚板理论对巷道底板进行分析,认为其在不稳定应力下的变形为非协调变形,在这种情况下底板存在较大的失稳可能性;运用突变理论对底板的稳定性进行分析,得到了底板失稳的关键判据。计算结果表明华亭煤矿250104工作面底板在开采扰动下会产生结构性失稳,而陈家沟煤矿8512工作面底板结构较为稳定,受到扰动时较不容易发生结构性失稳,和实际情况相吻合。

In order to study roadway floor stability under rock burst,by floor type rock burst field monitoring of Huating coal mine field,the floor stress was larger influenced by mining in Huating coal mine field,roadway floor was analyzed by medium thick plate theory,incompatible deformation appeared under instability stress,there is a large possibility of instability of the floor appeared in the case,so the stability of floor could be illustrated by mutation theory,and then the critical criterion of floor failure was proposed,but the floor structure of 8512 working face of Chenjiagou coal mine was stability,and structure instability would not easily appeared under mining disturb,and similar to the practice.