邻近爆破作业下采空区顶板振动效应分析

Analysis of the vibration effect of the roof plate in the mining area under adjacent blasting operation

爆破振动是影响采空区顶板稳定性的因素之一,强烈的爆破振动会导致顶板失稳塌陷。结合爆破振动监测试验,通过理论分析与数值模拟对采空区顶板振动效应进行分析。结果表明:空区最小安全距离为196.825m,单段最大装药量为268.589kg;对比三种不同爆破振动波下的顶板振动效应,揭示了峰值振速越大,顶板的质点位移越大,反之越小;结合矿山开采情况给出了保护空区的降振措施。

Blasting vibration is one of the factors affecting the stability of the roof plate in the mining area,and strong blasting vibration can lead to destabilization and collapse of the roof plate.Combined with blasting vibration monitoring test,the effect of roof vibration in the empty area is analyzed by theoretical analysis and numerical simulation.The results show that:the minimum safe distance of the empty zone is 196.825 m,and the maximum charge of a single section is 268.589 kg;comparing the vibration effect of the roof plate under three different blasting vibration waves reveals that the larger the peak vibration velocity is,the larger the mass displacement of the roof plate is,and vice versa,the smaller it is;the vibration reduction measures for protecting the empty zone are given in combination with the mining situation.