RESEARCH ON INFLUENCE MECHANISM OF CONFINING PRESSURE ON ROCK BREAKAGE BY TBM CUTTERS
PENG Qi1,2,3,4
(1. Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;2. School of Civil Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;3. College of Water Resources and Hydropower,Sichuan University,Chengdu,Sichuan 610065,China;4. Shenzhen Municipal Design and Research Institute Co.,Ltd.,Shenzhen,Guangdong 518029,China)
Abstract:TBM tunnels through the high mountain will inevitably encounter high stress problem,and the research on the influence mechanism of high stress on TBM breakage is very important. The influence of confining pressure on rock fragmentation by TBM cutters is successfully studied by using mechanical analysis and numerical simulation,and it implies that the impact of confining pressure is very complicated. The depths of crushed zone and lengths of cracks parallel to normal force decrease with increasing confining pressure,but confining pressure facilitates rock fragmentation and promotes chipping process,and the side cracks will develop rapidly and smoothly. The TBM in-situ penetration experiment shows that the rock is excavated more easily by TBM with increasing confining pressure. Considering the difficulty of rock chipping by TBM cutters,the results of mechanical analysis and numerical simulation and TBM in-situ penetration experiment all prove that confining pressure is favorable to TBM cutter breakage and penetration.
彭 琦1,2,3,4. 围压对TBM滚刀破岩影响机制研究[J]. 岩石力学与工程学报, 2014, 33(sl): 2743-2749.
PENG Qi1,2,3,4. RESEARCH ON INFLUENCE MECHANISM OF CONFINING PRESSURE ON ROCK BREAKAGE BY TBM CUTTERS. , 2014, 33(sl): 2743-2749.
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