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通过对海孜煤矿762工作面上覆厚度较薄、变化大、整体性较差的火成岩的微震监测,分析了此特殊条件火成岩变形破断的微震活动规律。结果表明,火成岩下微震活动以低能量震动为主,0～200 J的占83.1%,不会对工作面的回采构成顶板动力威胁;火成岩的破断形式为分层破断,并非整体劈裂破断;火成岩破断微震信号的频谱特性为振幅小、持续时间短、衰减快;主要频带范围为0～200 Hz,主频在50 Hz和150 Hz左右,呈现“双峰值”现象。此规律的获得,可以为类似条件火成岩破断的监测与预警提供有效的途径。
By means of microseismic monitoring of igneous rocks with thin thickness, large variation and low integrity over the face of 762 in Heibei coal mine, the microseismic activity law of igneous rock deformation and fracture under this special condition was analyzed. The results show that the microseismic activity under igneous rock is dominated by low-energy vibration, accounting for 83.1% of 0 ~ 200 J, which will not pose a roof-power threat to mining face. The riprap riprap is broken by layers and not fragmented. The spectral characteristics of fractured igneous seismic signals of igneous rocks are small amplitude, short duration and fast attenuation; the main frequency band is 0 ~ 200 Hz, the dominant frequency is about 50 Hz and about 150 Hz, showing “double peak” phenomenon. Obtaining this law can provide an effective way for the monitoring and early warning of igneous rocks in similar conditions.