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《Tunnel Construction》 2012-05
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Studies on Fragmentation Zone Distribution Laws of Deep Tunnel Based on Drucker-Prager Yield Criterion

LU Wen,GU Shaofeng,HOU Yirun(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510641,China)  
The broken zone,plastic zone and elastic zone appear in the surrounding rock due to the stress redistribution cased by excavation of deep tunnels.The fragmentation zone distribution laws of surrounding rock of deep tunnel are proposed on basis of Drucker-Prager yield criterion.The developing situations of 3 zones under different cover depths are analyzed by means of ANSYS and compared with load height recommended in the criterion.Influence of cover depth on radius of broken zone and plastic zone.The study results show that there is a linear relation between Rp,Rc and cover depth H,the trend of Fenner Formula.When the cover depth exceeds a critical depth,the broken zone develops rapidly and presents exponential growth.The distribution and the scope of broken zone the cover depth.
【CateGory Index】: U451
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