Elastic shear modulus variations during undrained cyclic loading and subsequent reconsolidation of saturated sandy soil
Elastic shear modulus variations during undrained cyclic loading and subsequent reconsolidation of saturated sandy soil
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DOI：
10.1016/j.soildyn.2018.10.041
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发表时间：
2019
影响因子：
4
通讯作者：
Kazuhiro Ueno;S. Kuroda;T. Hori;F. Tatsuoka
中科院分区：
文献类型：
--
作者：
Kazuhiro Ueno;S. Kuroda;T. Hori;F. Tatsuoka
为了研究饱和桑迪在固结、不排水循环加载和再固结过程中弹性剪切模量G 0的变化规律，对不同干密度的饱和砂土进行了多阶段三轴剪切试验。在各向同性有效应力相同的情况下，不排水循环加载时的G0值比初始固结时的G0值小。对于相同的有效应力参数，被认为是相关的各向同性和各向异性应力状态，在不排水循环加载过程中，在相同的有效应力参数在各向同性和各向异性应力状态下的G0值减少类似的增加，在以前的应变振幅。通过重新固结到原始有效应力状态，theG0值增加，部分原因是从剪切引起的损伤中恢复，部分原因是孔隙比的降低。前一因素的影响随着试样密度的增大而减小，后一因素的影响随着试样密度的增大而增大。结果表明，与初始固结结束时的初始值相比，密实试样再固结后的G0值显著减小，而松散试样再固结后的G0值显著增大。
To evaluate the variations in the elastic shear modulusG0of saturated sandy soil during consolidation, undrained cyclic loading and reconsolidation, we performed a series of multiple-phased triaxial tests with measurements of shear wave velocity on specimens having different dry densities. At the same isotropic effective stress, theG0value during undrained cyclic loading became smaller than that during initial consolidation. For the same effective stress parameter that was found to be relevant to the isotropic and anisotropic stress states, theG0value at an identical effective stress parameter at isotropic and anisotropic stress states during undrained cyclic loading decreases similarly with an increase in the previous strain amplitude. By reconsolidation to the original effective stress state, theG0value increased partly due to recovery from the shear-induced damage and partly due to a decrease in the void ratio. The effects of the former factor decreased as the specimen became denser, while the effects of the latter factor increased as the specimen became looser. As a result, compared with the initial value at the end of initial consolidation, theG0value after reconsolidation of the same specimen became significantly smaller with dense specimens while it became significantly larger with loose specimens.