期刊
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
卷 111, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tust.2021.103861
关键词
Roadway rockburst; Extra-thick coal seam; Quantitative mechanism; Seismic disturbance; Critical index; Case histories
资金
- National Key R&D Program of China [2017YFC0804205, 2017YFC0804208]
- Ministry of Science and Technology of the People's Republic of China
- Key Laboratory of the Ministry of Education on Safe Mining of Deep Metal Mines of Northeastern University
- Research Institute of rockburst (RIRB) of Liaoning province
Rockbursts are a severe dynamic disaster in mines, globally recognized as one of the most serious incidents. By using stability theory, this study obtained critical indexes for remotely triggered rockbursts, including key stress indicators for surrounding rock softening and fracture occurrence. Through quantitative calculations using typical case histories, the main influencing factors and laws of rockbursts were determined, laying a foundation for the development of quantitative criteria for rockbursts.
Rockbursts are globally recognized as one of most severe dynamic disasters in mines. Generally, rockbursts can be divided into self-initiated bursts type and remotely triggered bursts type in terms of their occurrence mech-anism. In recent years, various remotely triggered roadway rockburst accidents (induced by seismic disturbance) in deep extra-thick coal seam have been reported in China. In this study, using stability theory, seismic distur-bance factor was involved with in-situ stress, mechanical properties of the coal and rock mass, support strength, and roadway size to establish a mechanical model for rockburst and to obtain critical indexes of the surrounding rock fracture and rockburst occurrence. Accordingly we achieved the quantitative description of a remotely triggered roadway rockburst in extra-thick coal seams. In detail, using a rock fracture criterion, the critical ground stress indexes and corresponding formulas of surrounding rock softening and fracture occurrence were determined. Moreover, using an instability criterion, critical indexes of the roadway rockburst initiation were established, including the critical radius of the fracture zone, the critical radius of the softening zone, critical stress, maximum allowable disturbance stress, magnitude, and energy. The main influencing factors and laws of rockbursts were determined quantitatively. The critical indexes were quantitatively calculated using some typical case histories of roadway rockbursts in coal mines in China, which would lay a foundation for the development of quantitative criterion of rockbursts.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据