| 考虑岩体本构及结构尺度效应的地下洞室模型有限元分析 |
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| 引用本文： | 张玉军,张维庆.考虑岩体本构及结构尺度效应的地下洞室模型有限元分析[J].岩土力学,2012,33(1):262-267. |
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| 作者姓名： | 张玉军 张维庆 |
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| 作者单位： | 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 |
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| 基金项目： | 国家重点基础研究发展计划(973)资助项目(No.2010CB732101);国家自然科学基金资助项目(No.51079145) |
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| 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。
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| 关 键 词： | 本构尺度效应 结构尺度效应 地下洞室模型 有限元分析 |
| 收稿时间： | 2010-05-10 |
Finite element analysis of underground opening model considering constitutive and structural size effects |
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| ZHANG Yu-jun
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ZHANG Wei-qing.Finite element analysis of underground opening model considering constitutive and structural size effects[J].Rock and Soil Mechanics,2012,33(1):262-267. |
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| Authors: | ZHANG Yu-jun ZHANG Wei-qing |
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| Institution: | 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 |
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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. |
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| Keywords: | constitutive size effect structural size effect underground opening model finite element analysis |
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