【摘要】 云南驰宏锌锗股份有限公司会泽铅锌矿是我国一个千米深井矿山,其下属8号矿体采深已达1200余米,矿体赋存条件复杂,地应力高,导致微地震活动频发。本文根据微震监测数据及井下开采活动,对微震活动的时空分布、诱发模式以及预测预报进行了研究。结果表明:微震活动的时空分布主要与开采活动及地质构造有关,根据发生位置、震级大小、破坏特征可将微地震的诱发模式分为应变破裂、矿柱冲击以及断层滑移破裂三类,阐述了各自的发生机制。提出以地震学参数-活动率∑N/△t、视体积VA、能量指数EI的时间序列曲线来预测矿震灾害,并对其物理意义及破坏过程中可能出现的特征进行了理论分析,现场应用后证明:地压灾害发生前,活动率∑N/△t及视体积VA急剧增加,能量指数EI突然降低。更多还原

【Abstract】 Huize Lead & Zinc mine is a deep kilometer well in Yunnan chihong Zn & Ge Co.,LTD.in China,in which 8# orebody’s mining depth has reached more than 1200m.The deep ore body has complicated condition and high ground stress,which causes microseismic occuring frequently.Based on micro-seismic monitoring date and mining activities underground,the temporal and spatial distribution,induced model,prediction and forecast of microseismic activities are studied.The results show: temporal and spatial of the microseismic activities associates with mining activities and geological structure.According to occurrence location,the size of magnitude and failure characteristics,the induced model of microseismic activity is divided into three types: strain burst,pillar-foundation failure and fault slip,occurrence mechanism and degree of damage are expatiated respectively.Predicting mine quake disaster by the time series curves of miroseismic active rate(∑N/△t),apparent volume(VA) and energy index(EI) is proposed.The physical meaning and possible characteristics in rock failure process are theoretical analyzed respectively.Field application shows: before the occurrence of ground pressure disaster occurring,microseismic activity rate(∑N/△t) and apparent volume(VA) will sharply increase,energy index(EI) quickly decrease.更多还原