裂隙岩体松弛模量分析  

Analysis of relaxation moduli of fissured rock mass

作　　者：徐卫亚[1] 杨松林[1] 

机构地区：[1]河海大学岩土工程研究所,江苏南京210098

出　　处：《河海大学学报（自然科学版）》2003年第3期295-298,共4页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金资助项目(50128908);国家重点基础研究发展规划项目(973)(2002CB412707);法国国家科研中心(CNRS)资助项目

摘　　要：利用线粘弹性断裂力学原理和Betti能量互等定理,推导了裂隙岩体单轴松弛模量和体积松弛模量的理论表达式,对比了两者之间的差异.并通过自洽理论来考虑裂隙相互作用的影响,计算结果指出裂隙间的相互作用将导致岩体松弛模量增大,这些研究成果为根据室内岩石流变试验推测裂隙岩体的流变特性提供了一种可能.同时还分析了几种流变材料的长期松弛稳定,并指出不同裂隙密度下岩体裂隙应力强度因子将随裂隙半径的增大而增加.Theoretical expressions of the relaxation moduli of fissured rock mass under uniaxial and hydrostatic strains are derived by use of the Betti reciprocal theorem and viscoelastic fracture theory, and the difference between the moduli is analyzed. The effect of the interaction between cracks is discussed based on the selfconsistency theory, and the calculated result indicates that the interaction will result in the increase of the relaxation moduli. The present method provides an approach to predicting the rheological parameter of fissured rock mass by laboratory tests on rock materials. Besides, the relaxation stability of several kinds of fissured rocks under hydrostatic strain is discussed, and the analysis reveals that the stress intensity factor increases with the crack radius at different crack densities.

关 键 词：裂隙岩体 松弛模量 岩石工程 弹塑性 室内土工试验 

分 类 号：TU433[建筑科学—岩土工程]