含水率和应力水平对粉质黏土动力性能影响研究

Effect of Moisture Content and Stress Level on Dynamic Performance of Silty Clay

摘要: 基于室内动三轴试验，对不同含水率、不同应力水平下土体动态回弹模量和长期变形特性进行了研究。结果表明：增大围压、减小含水率可有效提高动态回弹模量。其中，动态回弹模量随着偏应力比(即附加应力与围压比)的增加而呈指数式衰减；同时土体塑性变形随着振次的增加逐渐累加，荷载水平较低时，塑性变形发展速率比较缓慢，而当荷载水平较高时，塑性变形发展速率明显增加。

Abstract: The dynamic resilient modulus and long-term deformation characteristics of soil under different water contents and different stress levels were studied through indoor dynamic triaxial tests. The results show that increasing confining pressure and reducing water content can effectively improve the dynamic resilient modulus. The dynamic resilient modulus decreases exponentially with the increase of deviatoric stress ratio (the ratio of additional stress to confining pressure). At the same time, the plastic deformation of soil gradually accumulates with the increase of vibration times. When the load level is low, the development rate of plastic deformation is slow, and when the load level is high, the development rate of plastic deformation increases significantly. When the compaction degree is 94%, the optimal moisture content is 20%, and the plastic deformation is the smallest, which can be used to guide the subgrade design.