冻土横观各向同性非线性本构模型的实验研究

Study on the constitutive model of transversely isotropic frozen soil

通过对冻土形成过程及组构特点的分析,指出冻土属正交各向异性材料;并对-5℃～-9℃之间冻土试件3个主方向应力–应变关系曲线、切线模量E以及各向泊松比μ进行了全面实验测定,应用复合材料力学理论,分析证实了冻土可以足够精确地认为是非线性横观各向同性材料,为建立新的冻土本构模型及强度准则,并为冻土与建筑物相互作用的数值分析提供了理论依据。

Based on the forming process and the characteristics of frozen soil, it was pointed out that frozen soil could be named as orthotropic material. With the application of mechanics of composite materials and the tests on stress and strain, elastic modulus, Poison＇s ratio in three principal planes under different temperatures, frozen soil could be regarded as the nonlinear transversely isotropic material. It could provide the basis for new constitutive model of frozen soil and numerical analysis on interaction between frozen soil and buildings.