CHARACTERS AND NUMERICAL SIMULATION OF ROCKBURST IN TUNNELS UNDER 2500M DEPTH
Rockburst is one of the most serious problems in assistant tunnels of the JinPing II hydropower station, the deepest run-through tunnels in China. For reducing the hazard brought by rockburst, some typical rockburst characteristics of assistant tunnels under 2500 m burial depth arc summarized in the paper, which reveals that the intrinsic reason for rockburst is the energy release. In order to understand the outburst mechanism, a new energy index, named local energy release rate (LERR), is put forward to simulate the rockburst. By tracking the peak value and valley value of elastic strain energy intensity before and after brittle failure, the evolution of LERR can be gained, which is helpful to easily understand the rockburst from the viewpoint of energy. To test its reliability, the brittle break of Mine-by tunnel in Canada is simulated successfully by LERR. What is more, a typical rockburst in assistant tunnels is analyzed by LERR. All of the simulated results show that LERR can satisfactorily predict the depth of outburst pit and intensity of rockburst, which paves a new way to evaluate the rockburst orientation for deep-buned underground engineering.
QUAN JIANG XIA-TING FENG TIAN-BING XIANG GUO-SHAO SU XIANG-BING WAN
State Key laboratory of Geomechanics and Engineering, Institute of Rock and Soli Mechanics, Chinese Department of Civil and Architecture Engineering, Guangxi University Naming, 530004, China East China Investigation and Design Institute.China Hydropower Engineering Consulting Group Co.Hangz
国际会议
The 7th International Symposium on Rockburst and Seismicity in Mines(2009年第七届国际岩爆与微振动性学术研讨会)
大连
英文
657-662
2009-08-21（万方平台首次上网日期，不代表论文的发表时间）