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,监测巷道掘进过程围岩破裂产生的微震活动及其时空特征,并进一步分析了巷道围岩不同位置破裂产生微震活动率的原因.结果表明:微震监测技术相比传统监测技术具有非常大的优势;发现了巷道掘进过程岩体破裂产生微震事件的震级范围主要集中在-4.37～-0....

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.