关键词: 黏土, 冻融循环次数, 动态回弹模量, 演变规律, 影响因素, 预估模型

Abstract: Dynamic triaxial tests under different deviatoric stresses and confining pressures were carried out to investigate the variations of dynamic resilient modulus of subgrade clay of varied initial moisture content and compaction degree under different freeze-thaw cycles.Results demonstrate that the dynamic resilient modulus of subgrade clay declines with the rising of initial moisture content and deviator stress,but is positively correlated with the degree of compaction and confining pressure.In the mean time,dynamic resilient modulus attenuates under freeze-thaw action,but remains stable after five freeze-thaw cycles.Furthermore,an effective regression model for predicting the dynamic resilient modulus of subgrade clay was established in consideration of the influence of freeze-thaw cycles,physical state and stress conditions.

Key words: clay, freeze-thaw cycles, dynamic resilient modulus, evolution rule, influencing factors, prediction model