Water Science and Engineering 2009, 2(3) 71-77  DOI:   10.3882/j.issn.1674-2370.2009.03.007   ISSN: 1674-2370 CN: 32-1785/TV

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multi-body finite element method
discontinuous deformation
surrounding rock deformation
elastic contact
coordination displacement
Wan-jin LIANG
Chao SU
Xiao-jun TANG
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Surrounding rock deformation analysis of underground caverns with multi-body finite element method

Wan-jin LIANG*; Chao SU; Fei WANG;Xiao-jun TANG

College of Water Conservancy and Hydropower Engineering, Hohai University,
Nanjing 210098, P. R. China


Discontinuous deformation problems are common in rock engineering. Numerical analysis methods based on system models of the discrete body can better solve these problems. One of the most effective solutions is discontinuous deformation analysis (DDA) method, but the DDA method brings about rock embedding problems when it uses the strain assumption in elastic deformation and adopts virtual springs to simulate the contact problems. The multi-body finite element method (FEM) proposed in this paper can solve the problems of contact and deformation of blocks very well because it integrates the FEM and multi-body system dynamics theory. It is therefore a complete method for solving discontinuous deformation problems through balance equations of the contact surface and for simulating the displacement of whole blocks. In this study, this method was successfully used for deformation analysis of underground caverns in stratified rock. The simulation results indicate that the multi-body FEM can show contact forces and the stress states on contact surfaces better than DDA, and that the results calculated with the multi-body FEM are more consistent with engineering practice than those calculated with DDA method.

Keywords multi-body finite element method   discontinuous deformation   surrounding rock deformation   elastic contact   coordination displacement   
Received 2009-04-14 Revised 2009-07-16 Online:  
DOI: 10.3882/j.issn.1674-2370.2009.03.007
Corresponding Authors: Wan-jin LIANG
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