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本文通过应力控制式固结不排水剪切试验，研究三峡围堰基淤砂的流滑特性．整理出淤砂的稳定状态线和稳定状态强度曲线，在此基础上，把饱和松砂的抗剪强度指标区分为大应变有效应力摩擦角Φ′、峰值有效应力内摩擦角Φ′ｐ、峰值总应力内摩擦角Φｐ以及稳定状态内摩擦角Φｒ４种类型供不同工程条件选用．文中还提出进入流滑状态的３个条件及土体内流滑区分布范围的分析方法．
In this paper, stress-controlled consolidation undrained shear test to study the silt flow characteristics of the Three Gorges cofferdam silt. On the basis of this, the shear strength index of saturated sands is divided into the large strain effective stress friction angle Φ ’, the peak effective stress internal friction angle Φ’p, the peak value The total internal stress Φp friction angle and internal friction angle Φr4 types for different engineering conditions selected. The article also puts forward three conditions for entering the slippery state and the analysis method of the distribution range of the slippery zone in the soil.