煤田地质与勘探Issue(6)：49-52,4.DOI:10.3969/j.issn.1001-1986.2013.06.012
综合考虑宏微观复合损伤的节理岩体本构模型
Constitutive model of jointed rock mass by combining macroscopic and microcopic composite damage
摘要
Abstract
The current study on damage constitutive model of jointed rock mass considers only the macroscopic damage caused by defects such as joints without considering the microscopic damage caused by defects such as micro-crack in rock blocks. Aiming at the above-mentioned shortage, the jointed rock mass constitutive model combining macroscopic and microscopic damage is proposed. The microscopic damage model is a statistical dam-age based on strain strength theory and the strength characteristics of rock micro-unit with Weibull distribution, which is used in rock blocks cut by joints. While the macroscopic damage model is mainly based on continuous media mechanics principle, deterioration of rock mass property caused by joints is regarded as damage. On the basis of considering compression and shear transfer coefficient of the joint, the constitutive model of jointed rock mass by combining macroscopic and microscopic composite damage is proposed. The calculation example indi-cates that existence of the joint greatly weakens the strength of rock mass, reduces its stiffness and enlarges its flexibility. So, the proposed constitutive model can reflect the effect of macroscopic and microscopic damage on rock mass stress-strain relationship and strength, which is rational.关键词
节理岩体/本构模型/宏观损伤/微观损伤/损伤张量Key words
jointed rock mass/constitutive model/macroscopic damage/microscopic damage/damage tensor分类
天文与地球科学引用本文复制引用
张吉宏,刘红岩..综合考虑宏微观复合损伤的节理岩体本构模型[J].煤田地质与勘探,2013,(6):49-52,4.基金项目
中央高校基本科研业务费专项资金项目(2010ZY45)；国家自然科学基金项目(41002113 （2010ZY45）
41162009)；教育部科学技术研究重点项目(211175) （211175）
