金属矿山深部巷道掘进期间地压监测系统和活动特征分析

为研究金属矿山深部巷道掘进期间围岩地压显现特点,在深部生产区域构建微震监测系统,观测巷道掘进过程围岩微震活动的时空特征,进一步研究了巷道围岩不同位置微震活动率的原因。结果表明：巷道掘进过程中微震事件矩震级范围主要集中在-4.37~0.063,微震事件矩震级平均值为-2.08,微震事件的能量释放较低。微震事件主要分为3个区域,分别为受断层构造影响的区域、受已有巷道施工爆破影响的区域及距离掘进巷道相对较远的区域；围岩体中累积视体积成核及视应力集中区域位置随着巷道掘进过程而改变,距离断层越近累积视体积成核及视应力聚集程度较高,距离断层越远累积视体积成核及视应力聚集程度发生明显降低；微震监测系统能够定量监测掘进巷道围岩体破裂情况,并能实时获取围岩体微震事件的演化规律,较传统岩体监测技术具由非常大的优势。

Analysis on characteristics of ground pressure monitoring system and activity during deep tunnel excavation in metal mine

In order to study the ground pressure behavior characteristics of surrounding rock during the excavation of deep roadway in metal mine, the microseismic monitoring system was built in the deep production area to observe the temporal and spatial characteristics of microseismic activity of surrounding rock during roadway excavation, and further studied the causes of microseismic activity rate at different positions of roadway surrounding rock. The results show that the moment magnitudes of microseismic events mainly concentrated in -4.37 ~ 0.063, and the average moment magnitudes of microseismic events are -2.08, and the energy release of microseismic events is low. Microseismic events are mainly divided into three regions, which are affected by the fault structure, the area affected by the blasting of the existing roadway and the area relatively far away from the driving roadway; the location of the accumulated apparent volume nucleation and apparent stress concentration area in the surrounding rock changes with the tunneling process, and the closer to the fault, the higher the cumulative apparent volume nucleation and apparent stress concentration are, and the distance from the fault is The results show that the more far the cumulative apparent volume nucleation and the degree of apparent stress accumulation decrease obviously; the microseismic monitoring system can quantitatively monitor the surrounding rock mass fracture and obtain the evolution law of microseismic events in surrounding rock mass in real time, which has great advantages over the traditional rock mass monitoring technology.