基于微震监测技术的断层活化规律及预警研究

为更好地研究自然崩落法开采过程中断层活化及顶板冒落规律,并在顶板发生大范围崩落前进行有效预警,利用微震监测技术对岩体活动进行监测。发现大部分微震事件发生在断层附近,且生产过程中主要断层附近岩体破裂较为严重。基于微震监测数据分析得出顶板大范围崩落前兆信息,提出衡量岩体内部损伤程度的能量指数与累积视体积之比EV值,并基于归一化处理量化EV值下降程度,成功对现场顶板冒落进行了预警。

Investigation on activation characteristics and predicting of faults based on microseismic monitoring

Microseismic monitoring technology is used for monitoring and predicting of rock mass activities, in order to better study the activation characteristics of fault and roof caving in natural caving mining process, and conduct prediction before large-scale roof collapse occurs. Results indicated that most of the microseismic events occur near the faults, and the rock mass of the analytical model near the faults was seriously fractured. The precursor information of large-scale roof caving was obtained based on the microseismic data, and the ratio of energy index to cumulative apparent volume (EV value) was proposed to measure the degree of rock mass damage, moreover, the roof caving on site was successfully predicted based on the normalization process to quantify the decline of EV value.