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

ZHANG Yu-jun; ZHANG Wei-qing

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

更新时间：2026-06-25

- Finite element analysis of underground opening model considering constitutive and structural size effects
- Vol. 33, Issue 1, (2012)
- 作者机构：
  
  1. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉,430071
  2. 西南交通大学土木工程学院,成都,610031
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU457
- Online First：17 January 2012，
  
  Published：2012
- 稿件说明：
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ZHANG Yu-jun, ZHANG Wei-qing. Finite element analysis of underground opening model considering constitutive and structural size effects[J]. 2012, 33(1).
DOI：

ZHANG Yu-jun, ZHANG Wei-qing. Finite element analysis of underground opening model considering constitutive and structural size effects[J]. 2012, 33(1). DOI：

摘要

对于地下洞室围岩稳定而言，存在两种尺度效应：一是本构尺度效应，二是结构尺度效应。在地下洞室模型的有限元分析中考察了两种尺度效应的作用。拟定了两种工况：①围岩中任一点的力学性质是该点到洞室中心距离的负幂函数，洞室由小到大，即同时考虑本构尺度效应和结构尺度效应；②围岩的力学性质一定，洞室由小到大，即只考虑结构尺度效应。对两种工况进行了平面应变弹塑性计算，分析了围岩中的应力、位移、及塑性区。从研究结果可知：当考虑岩体力学性质的尺度效应时，洞室围岩中的位移及塑性区均较小；而应力值较高，而不考虑岩体力学性质的尺度效应时的情况与之相反。

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.

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