原状和重塑海洋粉土动力特性对比试验研究

发布时间：2018-04-19 03:24

本文选题：海洋粉土 + 原状样　；参考：《地震工程学报》2014年04期

【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。
[Abstract]:The dynamic strength, dynamic shear modulus and damping ratio of undisturbed and remolded marine silt were studied by means of vibration triaxial apparatus and resonance column instrument, and the difference of dynamic characteristics between the original and remolded samples was compared and analyzed.The experimental results show that the dynamic shear modulus and reference shear strain of undisturbed marine silt are higher than that of remolded samples under the same conditions, and the damping ratio is close to that of remolded samples.The normalized G / Gmax- 纬 / 纬 r and 位-纬 / 纬 r curves can well eliminate the influence of disturbance on remolded samples, and the liquefaction stress ratio and dynamic strength of undisturbed marine silt are smaller than those of remolded samples under the same conditions.The difference of the dynamic strength between the original and remolded samples at the same equivalent cyclic vibration times decreases with the increase of the consolidation ratio, and when the specimen is about to be destroyed, the pore pressure of the remolded sample increases sharply, and the pore pressure of the original sample tends to be stable.
【作者单位】：河海大学岩土力学与堤坝工程教育部重点实验室;河海大学岩土工程科学研究所;
【基金】：国家自然科学基金项目(U1134207,51109068)
【分类号】：TU435

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