高构造应力区矿震规律研究

Study of mining shock in high tectonic stress zones

利用华亭煤矿微震监测系统,研究了处于褶皱区域矿震灾害严重的250102工作面开采过程中矿震时空演化规律.结果表明:强矿震大部分发生在向斜轴部,向斜轴处冲击动力灾害危险高于其他位置.向斜轴部强矿震周期短,频次高;强矿震发生前,震动次数持续上升,但震动能量出现"平静"或下降趋势,可作为高应力向斜构造区强矿震预测的前兆信息.高构造应力区强矿震波形持续时间长,频谱呈高频多峰分布,破坏性大.降低产量,工作面匀速推进与超前卸压相结合,能控制高构造应力区矿震灾害强度.

The space-time evolution of mining shock during the extraction of the 250102 work face that was subject to the disasters in the fold region was studied using the micro-seismic system installed in the Huating colliery.The results show that most large mine shock occurs along the synclinal axis.Hence,these are much more dangerous than other areas.Large tremors along the synclinal axis are characterized by short cycles and a high frequency of occurrence It also seems that the number of tremors continued rise while the energy level was trending downward or ＂calm＂.The waveforms from large tremors last much longer and have a multi-peak high frequency spectrum characteristic of great destructive power.Methods suggested for controlling tremor intensity are reduced output and uniform advance at the working face combined with stress relief ahead the work face.