Similar material simulation experimental study on rockbursts induced by key stratum breaking based on microseismic monitoring#br#
CUI Feng1，2，YANG Yanbin1，2，LAI Xingping1，2，CAO Jiantao1，2
(1. Energy School，Xi?an University of Science and Technology，Xi?an，Shaanxi 710054，China；
2. Key Laboratory of Western Mines and Hazard Prevention of Ministry of Education，Xi?an University of Science and Technology，Xi?an，Shaanxi 710054，China)
Abstract：In order to study the breakage and energy release regularity of impact tendency roofs，physical similar material simulation experiment was carried out，and the distribution characteristics of microseismic events under the solid coal and the goaf and the relationship between microseismic events and the rock pressure were studied combined with microseismic monitoring instruments and pressure sensors. The influence of the rock pressure on energy accumulation and release of coal and rock mass was analyzed，and the mechanism of rockbursts induced by breakage of the key strata was revealed. The results show that the microseismic events under the solid coal mainly occur in the roof strata in front of the working face and that the energy release value of microseismic events under the solid coal is higher than that under the goaf. The microseismic events under the goaf mainly occur in the roof strata behind the working face，and the frequency of the microseismic events is higher than that under the solid coal. Based on the similarity theorem，the formula of the energy similarity ratio was deduced，and the energy value of large events in the physical similar material model was defined as 333.33 J. It was found that large events mostly occur near the inverted trapezoidal structure in the stress increasing area. With shortening the distance between the working face and the open-cut roadway，the period of energy accumulation and release of microseismic events decreases. When rockburst is induced by breakage of the key stratum，the elastic energy accumulated in the main key stratum provides energy for rockburst. The location of rockburst is generally in the stress increasing area affected by mining. The control strategies of controlling source，reducing stress concentration and conduction efficiency were put forward. The engineering monitoring results show that the roof of the working face is effectively controlled and safety production is guaranteed.
崔 峰1，2，杨彦斌1，2，来兴平1，2，曹建涛1，2. 基于微震监测关键层破断诱发冲击地压的物理相似材料模拟实验研究[J]. 岩石力学与工程学报, 2019, 38(4): 803-814.
CUI Feng1，2，YANG Yanbin1，2，LAI Xingping1，2，CAO Jiantao1，2. Similar material simulation experimental study on rockbursts induced by key stratum breaking based on microseismic monitoring#br#. , 2019, 38(4): 803-814.
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2019, Vol. 38 
