Evolution Analysis of Microseismic Events before and after Mining through Large-Scale Weak Zone with High Confined Water

The existence of large-scale weak zone will have a great adverse impact on coal mining in high confined aquifer. Taking the Wutongzhuang Coal Mine which is threatened by high-pressure water as an example, this paper studies difference between microseismic events before and after analyzes influence large size research results show that characteristics soft belt are small number events, spatial distribution concentrated, energy level large. amplitude higher, proportion larger than events; caused face more, loose, roof floor less, smaller, medium events. Due to joint mining, middle area working affected each aquifer increases suddenly, karst fissures aquifers further developed, there trend transfixion. Therefore, measures such grouting should be taken reinforce mining.