动力固结后饱和软土三轴剪切性状的试验研究

通过淤泥质饱和软粘土的三轴固结不排水剪切试验,研究了海相沉积原状土、重塑土以及超固结土在动力固结后的应力–应变性状表现。原状软土经过动力固结后在剪切过程中表现出应变软化,重塑软土在低围压下具有一定的应变硬化现象,而在高围压下则为应变软化型。3种状态下的软土的应力–应变关系曲线按照双曲线形式对围压均具有较好的归一性。应力路径分析表明,原状土经过动力固结后在剪切过程中表现出一定的超固结土的性状,而经过动力排水固结后,重塑土则具有明显的超固结土特性。

EXPERIMENTAL STUDY ON BEHAVIOR OF TRIAXIAL SHEAR TEST OF SATURATED SOFT CLAY TREATING WITH DYNAMIC CONSOLIDATION

Based on triaxial shear tests (CU) of saturated soft clay of marine deposit,the behaviors of stress-strain relationship of undisturbed soil of marine deposit,remolded soil and overconsolidated soil were analyzed. For the undisturbed soil treated with dynamic consolidation by drainage,the strain softening occurred in process of shearing;and remolded soil presented strain hardening in process of shearing under low confining pressure,but it has strain softening phenomenon under higher confining pressure. The stress-strain relationship curves of soft clay under these three states have better normalization to confining pressure. The test results show that the physico- mechanical properties of undisturbed soil,remolded soil and overconsolidated soil have different improvement in degree. Undisturbed soil treated with dynamic consolidation by drainage has some characteristics of overconsolidated soil;and overconsolidated characteristics of remolded soil treated with dynamic consolidation by drainage are obvious in process of shearing.