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Simulation of cracking near a large underground cavern in a discontinuous rock mass using the expanded distinct element method


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タイトル: Simulation of cracking near a large underground cavern in a discontinuous rock mass using the expanded distinct element method
著者: Jiang, Yujing / Li, Bo / Yamashita, Yuji
発行日: 2009年 1月
出版者: Elsevier BV
引用: International Journal of Rock Mechanics and Mining Sciences, 46(1), pp.97-106; 2009
抄録: The rock masses in a construction site of underground cavern are generally not continuum due to the presence of discontinuities, such as bedding, joints, faults and fractures. The performance of an underground cavern is principally ruled by the mechanical behaviors of the discontinuities in the vicinity of the cavern. A number of experimental and numerical investigations have demonstrated the significant influences of discontinuities on the mechanical, thermal and hydraulic behaviors of discontinuous rock masses, indicating that the deformation mechanism and stability of rock structures in the discontinuous rock masses depend not only on the existing discontinuities but also the new cracks generated and thereafter keep propagating due mainly to the stress redistribution induced by excavation. In this study, an Expanded Distinct Element Method (EDEM) was developed for simulating the crack generation and propagation due to the shear and tension failures in the matrix rock blocks. Using this method, excavation simulations of deep underground caverns have been carried out on the models with differing depths of cavern and differing geometrical distributions of the existing discontinuities. Model experiments by using the base friction test apparatus were conducted to verify the proposed numerical approach. Furthermore, the support effects of rock bolts on controlling the deformations of the rock mass surrounding a cavern and movements of key blocks were evaluated by means of the EDEM approach.
キーワード: Underground Cavern / Discontinuity / Crack Generation / Deformational Behavior / Support Design / UDEC
URI: http://hdl.handle.net/10069/20857
ISSN: 13651609
DOI: 10.1016/j.ijrmms.2008.05.004
権利: Copyright © 2009 Elsevier B.V. All rights reserved.
資料タイプ: Journal Article
原稿種類: author
出現コレクション:060 学術雑誌論文

引用URI : http://hdl.handle.net/10069/20857

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