【摘要】 对不同超固结比以及超固结形成条件下原状软黏土在主应力轴循环旋转条件下的孔压、应力应变关系等性状进行试验研究。研究结果表明,随着超固结比的提高,试样在主应力轴循环旋转过程中的动强度及等效瞬时刚度均有显著提高,而其孔压开展特征则受前期超固结形成过程中反压控制条件影响:若超固结卸载时不提供反压恒定控制条件,试样在后续主应力轴循环旋转过程中的孔压迅速呈现负压的变化趋势,负孔压的持续开展程度随超固结比的增大而提高;而当超固结卸载时恒定控制反压,土体在后续的主应力轴旋转过程中,仅在强超固结比条件下孔压才会产生负向开展特征。但不同的反压控制条件未对土体在主应力轴循环旋转中的振次–应变关系以及动强度等特性产生显著影响。更多还原

【Abstract】 Experimental study on the overconsolidated clay under the cyclic principal stress rotation(CPSR) was performed.Emphasis was put on the influence of different overconsolidation conditions on the characteristics of samples during CPSR.It was found that with the increase of the over consolidation ratio,the equivalent dynamic stiffness and dynamic strength of samples during CPSR increased obviously,while these characteristics were independent of the back pressure control condition during overconsolidation.But whether or not the back pressure was kept constant greatly influenced the generation and level of development of negative pore pressure during the following CPSR stage.更多还原