【摘要】 利用振动三轴仪和共振柱仪对原状和重塑海洋粉土的动强度、动剪切模量和阻尼比进行试验研究,并对原状和重塑样所表现出的动力特性的差异进行对比分析。试验结果表明:在相同工况下,原状海洋粉土的动剪切模量和参考剪应变均大于重塑样,阻尼比与重塑样比较接近;归一化的G/Gmax-γ/γr和λ-γ/γr关系曲线可以很好地消除重塑样的扰动性所引起的影响;原状海洋粉土的液化应力比和动强度比在相同工况下的重塑样小,原状和重塑样在相同等效循环振次下的动强度的差异性随着固结比的增大而减小;在试样即将破坏时,重塑样的孔压急剧增大,原状样的孔压趋于稳定值。更多还原

【Abstract】 The behaviors of dynamic strength,dynamic shear modulus,and damping ratio of undisturbed and remolded marine silt by dynamic triaxial and resonant column tests are analyzed.The test results show that under the same conditions,the dynamic shear modulus and reference shear strain of undisturbed silt are greater than those in the remolded soil,although the damping ratios are closer in value.In addition,the normalized G/Gmax-γ/γrandλ-γ/γrcan weaken the influence caused by disturbance of the remolded silt.Moreover,the stress ratio of liquefaction and dynamic strength of undisturbed marine silt are smaller than remolded soil in the same conditions.Along with the increase in consolidation ratio,the difference in dynamic strength of undisturbed and remolded silt decreases under the same equivalent vibration cycle times.Further,the pore water pressure of remolded silt increases sharply,and the pore water pressure of remolded soil tends to be stable when the samples are about to be damaged.更多还原