Qingdao Technological University

Geological structure characteristics in a coal mine is described and underground mining activity is summarized at first. Then, the characteristics and laws of microseismicity induced by underground mining and geological structure activation are analyzed. The relationship between underground mining and structure activation is derived. Finally, the laws of failure induced by microseismicty in the coal mine are summarized. The result can be used in studying of microseismic phenomena in other mines with similar geological setting. 1 The Characteristics of Geological Structure in Mining Area The Beipiao coalfield is located in the complex position between the Tianshan-Yinshan zonal structural belt and the new cathaysian system subsidence belt. Subsidiary fractures lie in compound joint positions of Heichengzi of new Cathaysian, the north part of Kezuo depression and NW-trending Pingzhuang and Fuxin depression. It is a coal-forming basin with wave depressions. 1.1 Regional Fault Structure There are four faults from north to south in the mining area. The Longtan fault is located in the north border of the mining area. The Tayingzi fault is a buried structure. The Jianshanzi fault, more widely disputed in history as the Feilaifeng fault by Mr.Weng initially, is at the present thought to be a pressure wrench fracture. The Nantianmen fault located in the southeast border of the coalfield forming boundary of Hecheng and Kezu