›› 2012, Vol. 33 ›› Issue (1): 262-267.

• Numerical Analysis • Previous Articles     Next Articles

Finite element analysis of underground opening model considering constitutive and structural size effects

ZHANG Yu-jun1，ZHANG Wei-qing2   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
  • Received:2010-05-10 Online:2012-01-10 Published:2012-01-17

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Abstract: The authors think that there exist two kinds of size effects for the stability of surrounding rock mass of an underground opening; namely they are the constitutive size effect and the structural size effect. As a tentative inquiry, the authors try to investigate the actions of the two kinds of size effects in the finite element analysis (FEA) for an underground opening model. So two cases are assumed: the first one, the mechanical properties at any point in surrounding rock mass are the negative power functions of distance between the point and the opening center; and the opening span changes from small to large, that is, the constitutive size effect and the structural size effects are considered simultaneously; the second one, the mechanical properties of surrounding rock mass are constants, but the opening span changes from small to large; that is, only the structural size effect is considered. The elastoplastic calculations under a plane-strain condition are carried out for the two cases; and the stresses, displacements and plastic zones in the surrounding rock mass are analyzed. The results show that: the displacements and plastic zones in the the surrounding rock mass are smaller; and the stresses are comparatively large, considering the constitutive size effect of the mechanical properties; but the situation of without considering the constitutive size effect is the other way round.

Key words: constitutive size effect, structural size effect, underground opening model, finite element analysis

CLC Number: 

  • TU 457
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