土体两种各向异性的区别与联系精选.pdf

第 24 卷 第 9 期 岩石力学与工程学报 Vol.24 No.9 2005 年 5 月 Chinese Journal of Rock Mechanics and Engineering May ，2005 土体两种各向异性的区别与联系 1 1 2 张坤勇 ，殷宗泽 ，梅国雄 (1. 河海大学 岩土工程研究所，江苏 南京 210098 ；2. 南京工业大学 土木工程学院，江苏 南京 210009) 摘要：原生和次生各向异性是土体的重要特性，两种各向异性既有区别，又有联系，都与土体所具有的结构性特 点密切相关，但所产生的条件和机理有所不同。两种各向异性的区别集中体现在应力–应变关系矩阵上。复杂应 力状态下砂土真三轴试验结果表明，次生各向异性对土体应力–应变关系有很大影响，是土体特性的本质体现， 在某些工程实践中，对于土体应力变形分析的结果影响很大，土工数值分析中应当充分考虑其影响。 关键词：土力学；原生各向异性；次生各向异性；真三轴 中图分类号：TU 43 文献标识码：A 文章编号：1000 –6915(2005)09 –1599 –06 DIFFERENCE AND CONNECTION OF TWO KINDS OF ANISOTROPY OF SOILS 1 1 2 ZHANG Kun-yong ，YIN Zong-ze ，MEI Guo-xiong (1. Institute of Geotechnical Engineering ，Hohai University ，Nanjing 210098 ，China； 2. College of Civil Engineering，Nanjing University of Technology ，Nanjing 210009 ，China) Abstract ：The inherent anisotropy and the induced anisotropy are important characters of soil. There are difference and connection between them. They are both related to the structural character of soils，but the mechanism and conditions are different. The most important difference can be observed from the stress-strain matrix ，which has much influence on stress-strain relationship of soils. It can be drawn from the results of true triaxial tests that induced anisotropy has much influence on behavior of soils under complex stress conditions，which should be considered in numerical analysis on soils. Key words ：soil mechanics；inherent anisotropy ；induced anisotropy ；true triaxial 性，即次生各向异性对于土体应力变性特性也有显