土体两种各向异性的区别与联系

DIFFERENCE AND CONNECTION OF TWO KINDS OF ANISOTROPY OF SOILS

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。

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.