一种非饱和土的非线性抗剪强度包络壳模型

doi:10.13722/j.cnki.jrme.2018.0608

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摘要为了更直观和全面地揭示非饱和土的抗剪强度变化规律，针对土体剪切破坏面上抗剪强度与法向应力呈非线性关系以及基质吸力关联摩擦角随基质吸力改变呈非线性变化这2种试验现象，提出非饱和土的非线性抗剪强度包络壳模型，并据此提出相应的基于土水特征曲线参数的非饱和土非线性抗剪强度计算方法。研究表明：模型中各参数较易获取且无需增加额外的试验；与Fredlund包络(平)面模型相比，本模型参数获取过程更为客观，可有效保证计算的唯一性和准确性；通过与多个文献案例进行对比分析，本模型的适用性与可靠性得到验证，尤其是对于不便于直接测定吸力而应力水平又较高的非饱和土样，本法可获取更精确的抗剪强度。

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	方薇

关键词 ：土力学, 非饱和土, 非线性抗剪强度, 基质吸力, 土水特征曲线, 包络壳

Abstract：To reveal the variation of shear strength of unsaturated soil more intuitively and entirely，a nonlinear envelope shell model for shear resistance of unsaturated soil was put forward considering the fact that the shear resistance develops nonlinearly with the normal stress acting on the failure surface and that the friction angle varies nonlinearly with the matric suction. A method calculating the shear resistance based on the soil-water characteristic curve of unsaturated soil was suggested. The parameters in the suggested model are easily obtained without the additional tests. Moreover，comparing to Fredlund?s plane envelope model，the acquisition process of parameters is more objective，and hence，the uniqueness and accuracy of the calculation are guaranteed. The applicability and reliability of the suggested model for nonlinear shear strength of unsaturated soil were verified by comparing with some cases from literatures. Especially，this method can obtain more accurate shear strength for the unsaturated soil samples which are not easy to measure suction directly under high stress levels.

Key words： soil mechanics unsaturated soil nonlinear shear strength matric suction soil-water characteristic curve envelope shell

引用本文:

方薇. 一种非饱和土的非线性抗剪强度包络壳模型[J]. 岩石力学与工程学报, 2018, 37(11): 2601-2609.
FANG Wei. An envelope shell model of nonlinear shearing strength for unsaturated soils. , 2018, 37(11): 2601-2609.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0608 或 http://www.rockmech.org/CN/Y2018/V37/I11/2601

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