微震监测参数主要特性及关系的研究

Study on the Major Characteristics and Relationship of Microseismic Monitoring Parameters

通过对会泽铅锌矿微震监测系统记录的大量数据的分析,利用系统自带软件对其中主要参数进行了深入研究,发现微震震级与微震事件频率之间、微震能量与地震矩之间以及视应力与地震矩之间都存在幂律分布特性。同时,基于井下重点监测区域发生的岩体失稳现象,分析了岩体失稳前兆和事件频度、累计视体积等微震参数随时间变化的关系,发现微震监测主要参数在岩体失稳之前呈现出异常变化趋势,利用这些参数变化征兆来研究岩体失稳时间阈值完全可以满足预测预报要求。

A large amount of data from the microseismic monitoring system in Huize lead-zin c mine was analyzed,then in-depth study on the major parameters of microseismic events was made by the software come with the system.It was found that there wer e power law distribution characteristics between microseismic magnitude and freq uence,microseismic energy and moment,and the apparent stress of rock and microse ismic moment.At the same time,based on rock destabilization events occurred in m ajor underground monitoring areas,the changes of the premonition of rock destabi lization,the event frequency and the accumulated apparent volume depending on ti me were analyzed. It was found that before rock destabilization occurred the maj or microseismic monitoring parameters showed abnormal changes.It can fully meet requirements of prediction and forecast to use the changing signs of these param eters to study the threshold time of rock destabilization.