Influence of cyclic loading history on small strain shear modulus of saturated clays
Influence of cyclic loading history on small strain shear modulus of saturated clays
复制标题
循环加载历史对饱和粘土小应变剪切模量的影响
DOI：
10.1016/j.soildyn.2014.06.027
复制
发表时间：
2013-12
影响因子：
4
通讯作者：
Guo Lin
中科院分区：
文献类型：
--
作者：
Gu Chuan;Wang Jun;Cai Yuanqiang;Guo Lin
小应变剪切模数Gmax是土动力学中的一个基本参数，通常根据Hardin和Richart方程进行估算。然而，许多前人对砂土的研究表明，Hardin和Richart方程没有考虑循环荷载历史对Gmax的影响。本文利用压电-陶瓷弯管单元系统和循环三轴组合装置，研究了不排水条件下循环荷载历史对饱和粘土Gmax的影响。动态预加载既包括相对较高的循环应力幅值，也包括较高的循环应变幅值。为了进行比较，还考虑了没有循环加载历史的Gmax。试验结果表明，在相同的有效应力下，循环应变历史和循环应力历史都会导致Gmax比相应的非循环加载效应下的Gmax减小。在应变控制试验中，Gmax的下降幅度较小且相对稳定，而在应力控制试验中，当有效应力下降到一定程度时，Gmax的下降幅度突然而显著地增大。双幅轴向应变与剩余超孔隙水压力特性的对比表明，Gmax的显着降低可以反映饱和粘土的循环破坏。
Small strain shear modulusGmaxis an essential parameter in soil dynamics, and it is usually estimated based on the Hardin and Richart equation. However, many previous researches on sands have indicated that the Hardin and Richart equation does not consider the influences of cyclic loading history onGmax. In this paper, effects of cyclic loading history onGmaxof saturated clays under undrained conditions are studied using a combination device of piezoelectric-ceramic bender element system and cyclic triaxial apparatus. The dynamic pre-loading includes both relatively high amplitudes of cyclic stresses and cyclic strains.Gmaxwithout cyclic loading history is also investigated for the comparison purpose. Test results show that, at the same effective stress, both cyclic strain history and cyclic stress history will induce reduction ofGmaxcompared to the correspondingGmaxvalues with non-cyclic loading effects. In strain-controlled tests, the reduction ofGmaxis slight and relatively stable; while in stress-controlled tests, the reduction ofGmaxincreases suddenly and remarkably when the effective stresses degrade to a certain degree. The comparison between double amplitude axial strain and residual excess pore water pressure behaviors show that the remarkable reduction ofGmaxcan demonstrate the cyclic failure of saturated clays.
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DOI：
10.1061/(asce)1090-0241(1998)124:11(1071
发表时间：
1998-11
影响因子：
3.9
作者：
X. S. Li;W. Yang
通讯作者：
X. S. Li;W. Yang
影响因子：
2.4
作者：
SHIRLEY, DJ;HAMPTON, LD
通讯作者：
HAMPTON, LD
影响因子：
4
作者：
C. Gu;Jun Wang;Yuanqiang Cai;Zhongxuan Yang;Yufeng Gao
通讯作者：
C. Gu;Jun Wang;Yuanqiang Cai;Zhongxuan Yang;Yufeng Gao
DOI：
--
发表时间：
1971-09
期刊：
Journal of the Soil Mechanics and Foundations Division
影响因子：
--
作者：
H. Seed;I. M. Idriss
通讯作者：
H. Seed;I. M. Idriss
DOI：
10.1061/jsfeaq.0001398
发表时间：
1970-03
期刊：
Journal of the Soil Mechanics and Foundations Division
影响因子：
--
作者：
V. Drnevich;F. E. Richart
通讯作者：
V. Drnevich;F. E. Richart