关键词: 巨型逆冲断层, 深部煤层, 断层活化, 冲击灾变, 相似试验

Abstract: Taking typical fault rockburst mine for example, using similar simulation test to analyze overlying strata movement and the stress variation rule of fault plane and dip abutment pressure after the coal seam of the giant thrust fault footwall has been exploited based on coupling disaster-causing mechanism between spatial structure instability of overlying strata and fault activation, and the rockburst characteristics of extra-thick hard roof and easy burst coal seam influenced by giant thrust fault are studied. The results show that there are three stages in rockburst catastrophe process of the giant thrust fault induced by mining ultra thick seam. The first stage, high stress concentration region forms under the influence of overlying strata movement when mining coal seam. The second stage, overlying strata spatial structures evolution induce fault activation, and fault activation leads to external rock mass of spatial structures rotation applying extraneous load to spatial structures, causing instability increased, stress increased and influence scope enlarged. The third stage is the fault slip with releasing energy and providing dynamic load . Ultimately, the scope of significantly affect areas of thrust fault is delimited combining with the stress observation data. The results provides reliable basis for the protection strategy and control design of rockburst for coal mining influenced by giant thrust fault.

Key words: giant thrust fault, deep coal seam, fault activation, rockburst catastrophe, similar experiment