Anisotropic shear strength behavior of a compacted soil and its application to slope stability analysis

压实土各向异性抗剪强度特性及其在边坡稳定性分析中的应用

• 批准号: 05650475
• 负责人: YAMAGAMI Takuo
• 金额: $ 1.41万
• 依托单位: The University of Tokushima
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650475/
• 关键词: Anisotropy; Compacted soil; Shear strength; Cohesion; Angle of internal friction; Stability analysis; Slip surface; Factor of safety

The purpose of this study is to clarify experimentally the anisotropic shear strength characteristics of a compacted soil and to develop a computer program for the slope stability analysis of embankments consisting of the soil considering the anisotoropic effect. The results may be summarized as follows :1.A number of triaxial compression tests were conducted on the samples extracted at various angles from a compacted model ground. Then an anisotropic shear strength equation has been derived from the Coulomb equation, Mohr circles at failure and the inclination angle of the failure plane in each specimen.2.Cohesion and angle of internal friction appearing in the shear strength equation are both functions of sample orientations. It is interesting to note that the functions have the same form as those proposed by McLamore et al.for anisotropic sedimentary rocks.3.The cohesion and angle of internal friction are also expressed as functions of the angle between the shear plane and the bedding plane in each specimen. Stability analyzes performed based on these functions show that the shear strength anisotropy leads to smaller values of the factor of safety and flatter critical slip surfaces in shape than those obtained from the isotropic shear strength assumption.

本研究的目的是通过试验阐明压实土的各向异性抗剪强度特性，并编制考虑各向异性效应的压实土边坡稳定性分析的计算机程序。主要研究结果如下：1.对从压实模型地基上不同角度取下的土样进行了三轴压缩试验。根据库仑方程、破坏时的莫尔圆和各向异性试件中破坏面的倾角，推导出了各向异性抗剪强度方程。2.抗剪强度方程中出现的粘聚力和内摩擦角都是试件方向的函数。有趣的是，这些函数的形式与McLamore等人提出的各向异性沉积岩的函数形式相同。3.粘聚力和内摩擦角也表示为每个试样中剪切面与层面之间夹角的函数。基于这些功能进行的稳定性分析表明，剪切强度各向异性导致较小的值的安全系数和平坦的临界滑动面的形状比从各向同性剪切强度假设得到的。