【摘要】 对天津滨海地区典型结构性软黏土进行了压缩试验和不同固结应力下的循环三轴试验。结果表明:结构性软黏土的静力变形特性以先期固结应力和结构屈服应力为分界点可分为3个阶段;不同固结应力下的动应变-振次关系曲线上存在着一个临界动应力比,且该值随着围压的增大而降低;孔隙水压力的变化以结构屈服应力为转折点呈现出不同的变化规律;当振动频率为2Hz时固结应力的改变对轴向动应变的影响不明显。更多还原

【Abstract】 A series of compression tests and cyclic triaxial shear tests under different consolidation stress are performed on the typical structural soft soil in Binhai region of Tianjin,which reveals the law of cyclic deformation under dynamic loading.The results show that the static deformation of structural soft clay can be divided into three parts by preconsolidation stress and structural yield stress.The relation curves of cyclic strain with cycle number under different consolidation stress has a critical dynamic stress ratio,which is not a fixed value,but reduces as the pressure increases.The changes of pore water pressure show different variation law taking the structural yield stress as a turning point.When vibrating frequency is 2 Hz,the influence of different consolidation stress on the dynamic strain is so little.更多还原