岩石单轴压缩端部效应的数值仿真分析

麦戈; 唐照平; 唐欣薇

doi:10.3969/j.issn.1001-5485.2013.06.015

长江科学院院报 >

2013 , Vol. 30 >Issue 6: 68 - 71

DOI: https://doi.org/10.3969/j.issn.1001-5485.2013.06.015

岩土工程

岩石单轴压缩端部效应的数值仿真分析

麦戈 ,
唐照平 ,
唐欣薇

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1.仲恺农业工程学院城市建设学院，广州 510225；
2.中交第三航务工程勘察设计院有限公司，上海 200032；
3.华南理工大学亚热带建筑科学国家重点实验室，广州 510640

麦戈（1970-），女，广东广州人，高级工程师，主要从事建筑工程结构设计和岩土工程的研究，（电话）13310898001

收稿日期: 2012-06-15

修回日期: 2013-06-04

网络出版日期: 2013-06-04

基金资助

国家自然科学青年基金项目(51109083) ；中央高校基本科研业务费专项资金资助(2012ZM0091) ；华南理工大学亚热带建筑科学国家重点实验室开放基金(2011KB28)

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Numerical Simulation of Rock’s End Constraint Effectunder Uniaxial Compression

MAI Ge ,
TANG Zhao-ping ,
TANG Xin-wei

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1.School of Urban Construction, Zhongkai University of Agriculture and Engineering, Guangzhou 510225,China 2.CCCC Third Harbor Consultants Co. Ltd., Shanghai 200032, China 3.State Key Laboratoryof Subtropical Building Science, South China University of Technology, Guangzhou 510640, China

Received date: 2012-06-15

Revised date: 2013-06-04

Online published: 2013-06-04

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摘要

为了研究端部摩擦对岩石强度的影响，基于连续介质力学的方法，采用非线性损伤本构关系，描述岩石材料的力学行为。在此基础上，引入岩石力学性能的Weibull随机概率分布，以表征岩石力学参数的非均质特性与损伤局部化现象，建立了岩石细观力学模型，并对一系列不同摩擦系数下的岩石试件单轴压缩试件进行了数值试验。计算结果表明，在岩石单轴压缩试验中存在着端部效应，端部效应对岩石试件（特别是长度较小）的单轴压缩强度、应力-应变曲线及破裂形态影响显著。因此，为获取真实的岩石力学特性，需有效地控制实验室试验条件，降低端部效应对测量结果的影响。

关键词： 端部效应; 单轴抗压强度; 细观力学; 非均匀性; 数值仿真

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麦戈 , 唐照平 , 唐欣薇 . 岩石单轴压缩端部效应的数值仿真分析[J]. 长江科学院院报, 2013 , 30(6) : 68 -71 . DOI: 10.3969/j.issn.1001-5485.2013.06.015

Abstract

The present research is to explore the influence of end friction on the strength of rock. On the basis of continuum mechanics, a mesoscale model of rock with nonlinear damaged stress-strain constitutive relations is presented to describe the mechanical behaviors of rock. Furthermore, the Weibull random probabilistic distribution for the heterogeneities of mechanical properties of rock and the damage localization is introduced. Numerical simulation of rock’s uniaxial compression tests with different friction coefficients is carried out. The results indicate that the effect of end constraint occurs during rock’s uniaxial compression test. The uniaxial compressive strength, stress-strain curve and fracture pattern of rock specimen(in particular, short specimen)are significantly affected by the end effect. It is necessary to control the experimental condition to reduce the influences of end effect on measurement results.

Key words： end effect; uniaxial compressive strength; meso-mechanics; heterogeneity; numerical simulation

参考文献

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