STIFFNESS JOINT SLIP INDUCED ROCKBURST AT DEPTH-A CASE STUDY USING DISTINCT ELEMENT METHOD
In August 2008, a major stiffness joint was exposed over tens meters behind tunnel face during TBM tunneling on deep Level (1400m below surface) of JP-II Dewater tunnel at Sichuan province, China, which provides a unique opportunity to study the recent joint-slip induced rockburst. Since rockbursts are the results of a violent release of energy from high stress bulb or clutch joint, it is appropriate to check the stress path and significant high stress area when TBM approaching and departing from the stiffness joint to explain the mechanics of joint-slip behaviour and the nsk of rockburst occurrence. In this paper, the TBM excavation sequences and joint geometries are examined and simulated through using the 3D distinct element code. The detail of simulation such as in-situ stress, rockmass constitutive model and property is also discussed. The simulated results exhibit significant different area of high stress bulb when tunnel face on hanging of stiffness joint and underlying which give an adequate explanation of where and when the rockburst occurrence.
WEI-JIANG CHU CHUN-SHENG ZHANG JIN HOU
East China Investigation and Design institute under CHECC, Hangzhou, China Hangzhou, 310014, P.R.China
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
673-678
2009-08-21（万方平台首次上网日期，不代表论文的发表时间）