›› 2011, Vol. 32 ›› Issue (5): 1568-1574.

• Numerical Analysis • Previous Articles     Next Articles

Study of support optimization of large underground cavern group excavation using elastoplastic damage finite elements

YUE Xiao-lei1, WANG Han-peng2, ZHENG Xue-fen3, SHI Xiang-rong1   

  1. 1. School of Civil Engineering, Shandong Jianzhu University, Ji?nan 250101, China; 2. Research Center of Geotechnical and Structural Engineering, Shandong University, Ji?nan 250061, China; 3. Shandong Urban Construction Vocational Collage, Ji?nan 250014, China
  • Received:2010-05-26 Online:2011-05-10 Published:2011-09-23

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Abstract: The geological conditions of large underground cavern group are complicated, of which the support project affects stability of surrounding rock. So it is important to study the support optimization of large underground cavern group excavation. In order to simulate rock mass veritably and analyze its damage in construction, the elastoplastic damage model and damage evolution equation are presented on the basis of the irreversible thermodynamics theory. The 3D elastoplastic damage finite element code D-FEM is programmed by using Fortran language, which has the capabilities of simulating excavation and support, computing quickly and group function. 3D numerical model of underground cavern group is established, input initial geostress is inversion of field stress measurement. The cavern group excavation by different support projects is simulated by D-FEM. The stress, displacement and damage of surrounding rock under three different cases are analyzed. The effect of No.2 support project is best and so is proposed. Considering damage evolvement, damage zones compared to plastic zones of FLAC3D, damage zones in side wall of cavern group increase remarkably. So the elastoplastic damage finite elements can analyze stability of underground cavern engineering.

Key words: elastoplastic damage model, 3D finite elements, underground cavern group, support optimization, stability

CLC Number: 

  • U 453.2
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