饱和黄土稳态强度特性的试验研究

饱和黄土的稳态强度（残余强度）是黄土边坡是否发生流滑的关键因素，为了评价饱和黄土的残余强度就需要很好地了解饱和黄土的不排水剪切性能。通过对重塑黄土的固结不排水三轴试验，研究了饱和黄土的稳态强度特性。试验研究发现饱和黄土有两种典型的不排水剪切特性：稳态特性和准稳态特性，且大多数情况下饱和黄土总表现为稳态特性，只有疏松的黄土表现出准稳态特性。根据试验结果得出了黄土的稳态线与稳态强度线，用来分析黄土边坡的流滑机理。同时证明了饱和黄土稳态线的存在性和惟一性；探讨了描述黄土稳态性质的参数内摩擦角和黏聚力的物理含义；比较了饱和黄土与砂土稳态特性的差异。

Experimental research on steady strength of saturated loess

Through analyzing the mechanism of flow slide of loess landslides, it can find the steady state strength (residual strength) plays a major role. The evaluation of residual strength requires a better understanding of undrained saturated loess behavior. The steady strength of saturated loess is discussed under stress-controlled undrained consolidation triaxial test. There are two typical stress-strain behaviors of saturated loess: steady state behavior and quasi-steady state. In majority situations, it exhibits steady state behavior. Only loose loess exhibits quasi-steady state behavior. According to the test results, steady state line and steady state strength line of saturated loess are obtained. These lines can be used to analyze the mechanism of flow slide. The existence and uniqueness of steady state line are proofed. The internal friction angle and cohesion can be used to describe the steady state behavior of saturated loess. The meaning of these parameters is discussed. The difference of saturated loess and sand is analyzed.