Unified Solutions for Unsaturated Soil Shear Strength and Active Earth Pressure

作者：Ch. Zhang, Jing Wen Zhao, Qiangqiang Zhang, Feng Xu · 年份：2010 · DOI：10.1061/41103(376)28 · 被引用次数：28 · 研究领域：Geotechnical Engineering and Soil Mechanics、Geotechnical Engineering and Soil Stabilization、Geotechnical Engineering and Underground Structures

The unified solution for shear strength for unsaturated soil in terms of two independent state stress variables is presented based on both Unified Strength Theory (UST) and Fredlund's shear strength theory for unsaturated soil, which can be especially versatile in reflecting the effect of intermediate principal stress. Considering different distributions of matric suction, the unified solution of active earth pressure for unsaturated soil is deduced, which could avoid some shortages of Rankine's active earth pressure. The influence of the intermediate principal stress and matric suction on the active earth pressure is also investigated. It is shown that the active earth pressure decreases significantly with an increase in the unified strength theory parameter or matric suction.