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。
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 mag- nitude and failure characteristics, the induced model of microseismic activity is divided into three types ： strain burst, pillar - founda- tion 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/Δt）, apparent volume （VA） and energy index （El） 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/Δt） and apparent volume （VA） will sharply in- crease, energy index （EI） quickly decrease.
出处
《铜业工程》
CAS
2011年第6期1-6,共6页
Copper Engineering
基金
教育部长江学者和创新团队发展计划资助(IRT0950)
国家自然科学基金重点资助项目(50934002)
关键词
深井开采
微震活动
时空分布
预测预报
deep underground mining
microseismic activities
temporal and spatial distribution
prediction and forecast
