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

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长江科学院院报 ›› 2013, Vol. 30 ›› Issue (6) : 68-71. DOI: 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¹，唐照平²，唐欣薇³

作者信息 +

Numerical Simulation of Rock’s End Constraint Effectunder Uniaxial Compression

MAI Ge¹, TANG Zhao-ping², TANG Xin-wei³

Author information +

文章历史 +

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。

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.

导出引用

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

MAI Ge, TANG Zhao-ping, TANG Xin-wei. Numerical Simulation of Rock’s End Constraint Effectunder Uniaxial Compression[J]. Journal of Changjiang River Scientific Research Institute. 2013, 30(6): 68-71 https://doi.org/10.3969/j.issn.1001-5485.2013.06.015

中图分类号： TU 458.4

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