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为了研究饱和黄土强度的影响因素,以原状饱和黄土为研究对象,应用TSZ30-2型台式三轴仪,进行了不同剪切速率及围压下的固结不排水三轴试验(CU)研究,试验结果表明剪切速率对饱和黄土的应力应变关系及强度特性有重要影响。在相同围压下,饱和黄土的峰值剪切强度随着剪切速率的增大呈现出先增后减的变化趋势,存在临界剪切速率;随着剪切速率的增大,内摩擦角逐步减小,黏聚力先增大后减小。
In order to study the influencing factors of saturated loess strength, intact saturated loess was taken as research object. The study of consolidated undrained triaxial tests (CU) under different shear rates and confining pressures was conducted by using TSZ30-2 benchtop triaxial apparatus. The experimental results show that the shear rate has an important influence on the stress-strain relationship and strength characteristics of saturated loess. Under the same confining pressure, the peak shear strength of saturated loess shows the trend of increasing firstly and then decreasing with the increase of shear rate, and there exists the critical shear rate. With the increase of shear rate, the internal friction angle decreases gradually Small, cohesion increases first and then decreases.