各向异性非线性强度条件下的边坡稳定性

SLOPE STABILITY ANALYSIS WITH NONLINEAR FAILURE ENVELOPES USING JANBU'S GENERALIZED PROCEDURE OF SLICES

解释了土体强度各向异性、非线性的物理本质,结合常规直剪试验、三轴试验结果,在前人工作基础上建立了边坡稳定性分析中强度各向异性、非线性的描述方法,其中特别提出了一个各向异性函数.基于Janbu普遍条分法(GPS),运用SPREADSHEET模板程序,提出了一个能将各向异性、非线性强度准则逐点等效到Mohr-(Coulomb直线强度准则处理上的迭代方法,准确方便地获得了非线性强度下的边坡稳定性分析.最后的算例展示了方法的使用过程.

The shear strength developed in a landslide is usually anisotropic and nonlinear. The anisotropy is primarily due to the process of sedimentation predominantly followed by one-dimensional consolidations. The nonlinearity could be attributed to 'interlocking' or 'dilatancy' of the material, which is generally dependent upon the stress level. In the paper, a new anisotropci function was been developed. An analytical method considering both anisotropy and nonlinearity of the failure envelopes is pre- sented in the paper. The nonlinear failure envelopes can be obtained from routine triaxial tests. In a SPREADSHEET setup, the authors developed an approach that uses the Janbu's Generalized Procedure of Slice and incorporates anisotropic and nonlinear failure envelopes. In the analysis, an equivalent Mohr-Coulomb linear relation is obtained by drawing a tangent to the anisotropic and nonlinear envelope. An illustrative example is given to show the feasibility and numerical efficiency of the method.