节理岩体非线性本构模型的研究  

STUDY OF NON-LINEAR CONSTITUTIVE MODEL FOR JOINTED ROCK MASSES

作　　者：肖卫国[1] 兑关锁[1] 任青文[2] 

机构地区：[1]北京交通大学土建学院,北京100044 [2]河海大学土木学院,江苏南京210098

出　　处：《工程力学》2010年第9期1-6,共6页Engineering Mechanics

基　　金：国家自然科学基金项目(50539030);国家重点基础研究发展计划项目(2010CB7321004)

摘　　要：基于节理岩体变形的非线性特征,针对在节理剪切过程中微凸体的磨损与破碎而导致的应力下降,提出了考虑峰后软化的切向变形本构模型,将传统的双曲线剪切应力-切向位移关系采用具有驼峰的软化型曲线。对节理岩体法向与切向耦合的剪胀关系,建立了一种新的非线性曲线,修正了以往的线性行为。所得计算结果与试验曲线的比较中,具有很好的吻合性。Based on the non-linear deformation character of rock joints, a new constitutive model that describes the soften deformation after the peak is presented. The new model accounts for the stress decline due to wear and degradation under shear loading. And the traditional hyperbolic relation between shear stress and shear displacement is change into a softening curve. The dilation relation, which causes coupling of the normal and shear responses is modeled with a non-linear curve, rather than linear. The predicated results agreed well with the test results.

关 键 词：非线弹性 剪胀 节理岩体 本构模型 破坏 

分 类 号：TU452[建筑科学—岩土工程]