A New Approach of Modeling Generation and Progress of Cracks in Discontinuous Rock Masses by Using Distinct Element Method

Nakagawa, Mitsuo; Jiang, Yujing; Esaki, Taito

doi:10.2208/jscej.1999.631_397

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…In this study, an Expanded Distinct Element Method (EDEM) [15] was developed for simulating the crack generation and propagation due to the shear and tension failures in the matrix blocks based on the distinct element code UDEC [16]. Using this method, excavation simulations of a deep underground cavern have been carried out on a series of models with differing depths and differing geometrical distributions of existing discontinuities.…”

Section: Introductionmentioning

confidence: 99%

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

Jiang

Yamashita

2009

International Journal of Rock Mechanics and Mining Sciences

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ABSTRACT: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.

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Section: Introductionmentioning

confidence: 99%

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

Jiang

Yamashita

2009

International Journal of Rock Mechanics and Mining Sciences

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Mechanical Behaviour and Support Design of Large Underground Opening in Discontinuous Rock Masses.

Jiang¹,

Xiao²,

Yamaguchi³

et al. 2001

Shigen-to-Sozai

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A rock mass in in-situ is not continuum and its mechanical behaviour is strongly affected by the behaviour of the existing discontinuities, such as bedding, joints, faults and fractures. Several experimental and numerical investigations have demonstrated the influence of discontinuities on mechanical, thermal and hydraulic behaviour of jointed rock masses. It has also been indicated based on the experimental and in-situ investigations that deformational mechanism and stability of rock structures in the discontinuous rock masses extremely depend on not only the existing discontinuities but also new cracks, which are generated and progress due to loading and/or excavation.This study is to develop an expanded distinct element method (EDEM) for simulation of generation and progress of new cracks due to shear and tension failure in the matrix blocks. As the applications, changing the depth of opening and geometrical distributions of the existing discontinuities carries out excavation simulations of deep underground opening. For the verification of the proposed approach, scale model experiments by using the base friction experiment apparatus are also carried out. Finally, effects of cable bolts on controlling deformations of the rock masses surrounding opening and movements of key blocks are discussed.

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A New Approach of Modeling Generation and Progress of Cracks in Discontinuous Rock Masses by Using Distinct Element Method

Cited by 2 publications

References 7 publications

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

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

Mechanical Behaviour and Support Design of Large Underground Opening in Discontinuous Rock Masses.

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