各向异性土体强度表述方法的研究

对各向异性土体的强度条件研究建立一种新的表述方法。借鉴复合材料力学中矩阵转换的数学方法,将各向异性砂样的柔度矩阵(或刚度矩阵)转化为各向同性等效参考砂的柔度矩阵(或刚度矩阵),同时导出与其相当的应力状态的表达式,以使对各向异性岩土材料的分析可转换为对各向同性状态进行分析,由此可将以前基于各向同性假设的强度条件能够用于各向异性土体。将计算结果与已有实验结果作了比较,发现两者具有较好的一致性。

Research on the Strength Formulation of Anisotropic Soil

A new method to express the strength condition of the anisotropic soil is proposed. Based on the method of matrix transformation used in the compound material mechanics, the anisotropic flexibility matrix (or stiffness matrix) of the anisotropic sand with a certain stress state is transformed to be an isotopic one of a certain isotropic reference material with the corresponding stress state, and a corresponding stress matrix is obtained simultaneously. By this step, the anisotropic soil material is transformed to the isotropic reference material. Then, the isotropic strength theory is applied on this isotropic reference material. Finally, the isotropy strength theory is expressed by the original stress matrix of the anisotropic soil. The calculation results are quite matched with the experiment results.