Dynamic characteristics test of undisturbed saturated soft clay in Shanghai under intermittent consolidation and drainage conditions
For the long-term settlement of foundation caused by high-speed train load,existing studies on dynamic triaxial test usually ignore the existence of the intermittent periods during the operation of the high-speed rails,so fail to consider the staged loading mode in practical terms.Accordingly,this paper researches on the dynamic characteristics of saturated soft clay in Shanghai under the condition of the intermittent stage consolidation and drainage considering the effects of dynamic stress,and explores how different dynamic stresses and loading modes affect the axial cumulative plastic strain of soil.The results show that a non-linear decreasing trend of the axial cumulative plastic strain increment generated by consolidation drainage can be recognized during the intermittent period with the backward movement of the intermittent stage.Holding the same vibration frequency,the cumulative plastic strain generated by the staged loading is about three times over that of the continuous loading when the dynamic stress amplitude is 10 kPa.When the dynamic stress amplitude increases to 30 kPa,the excess pore pressure generated by the continuous loading is approximately 5 times greater than that of the phased loading.These findings indicate that the staged loading mode could cause a more severe settlement of the high-speed rail foundation,which puts forward a higher requirement on the safety of high-speed rail operation.
万方数据
维普
