Similar material simulation experimental study on rockbursts induced by key stratum breaking based on microseismic monitoring

被引：0
|
作者：
Cui F. [1 ,2 ]
Yang Y. [1 ,2 ]
Lai X. [1 ,2 ]
Cao J. [1 ,2 ]
机构：
[1] Energy School, Xi'an University of Science and Technology, Xi'an, 710054, Shaanxi
[2] Key Laboratory of Western Mines and Hazard Prevention of Ministry of Education, Xi'an University of Science and Technology, Xi'an, 710054, Shaanxi
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2019年 / 38卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Key stratum; Large energy event; Microseism; Mining engineering; Rock burst; Similar simulation;
D O I：
10.13722/j.cnki.jrme.2018.1423
中图分类号：
学科分类号：
摘要：
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. © 2019, Science Press. All right reserved.
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页码：803 / 814
页数：11
相关论文
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