Modeling permanent strains of granular soil under cyclic loading with variable confining pressure
Modeling permanent strains of granular soil under cyclic loading with variable confining pressure
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模拟可变围压循环荷载下粒状土的永久应变
DOI：
10.1007/s11440-019-00868-w
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发表时间：
2020-06
期刊：
影响因子：
5.7
通讯作者：
Jun Wang
中科院分区：
文献类型：
--
作者：
Qi Sun;Quanyang Dong;Yuanqiang Cai;Jun Wang
以往的试验研究表明，在大多数情况下，可变围压（VCP）促进了粒状土永久应变的发展，表明VCP不应被忽视。然而，现有的经验公式并不能完全解释VCP对永久应变的影响。为此，对三种相对密度下的饱和砂土进行了三组恒定围压和VCP循环三轴试验。这些试验的目的是探讨影响因素，可以反映VCP对永久应变的影响，并应考虑建立的经验公式。试验结果表明，初始孔隙比的增大对砂土的永久应变有较大的影响。在CCP和VCP试验中，永久应变随最大偏应力与平均围压的应力比和应力路径长度的增加而增加。在此基础上，提出了考虑初始孔隙比、应力比、应力路径长度和循环次数的四参数方程，用于预测VCP循环荷载作用下的永久应变。实测和预测的永久应变的比较表明，该方程可以很好地捕捉永久应变响应在CCP和VCP测试。
Previous experimental studies showed that variable confining pressure (VCP) promoted the development of permanent strains of granular soils in most cases and indicated VCP should not be ignored. However, existing empirical formulas do not fully account for the effect of VCP on permanent strains. Therefore, three series of cyclic triaxial tests with constant confining pressure (CCP) and VCP are performed on saturated sand at three relative densities. These tests aim at investigating the influential factors which could reflect the effect of VCP on permanent strains and should be considered in establishing the empirical formula. Test results show that an increasing initial void ratio has great effect on the permanent strains of sand. The permanent strains increase with an increase in the stress ratio of maximum deviatoric stress to average confining pressureand the length of stress pathLin both CCP and VCP tests. Based on that, a four-parameter equation considering the initial void ratio, stress ratio, length of stress path, and number of loading cycles is proposed to predict the permanent strains under cyclic loading with VCP. Comparison between the measured and predicted permanent strains shows that the equation can well capture the permanent strain response in tests with CCP and VCP.
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DOI：
--
发表时间：
1971-08
期刊：
Journal of Soil Mechanics & Foundations Div
影响因子：
--
作者：
M. L. Silver;H. Seed
通讯作者：
M. L. Silver;H. Seed
影响因子：
3.7
作者：
T. Wichtmann;A. Niemunis;T. Triantafyllidis
通讯作者：
T. Wichtmann;A. Niemunis;T. Triantafyllidis
DOI：
--
发表时间：
1969-06
期刊：
--
影响因子：
--
作者：
I. Holubec
通讯作者：
I. Holubec
DOI：
--
发表时间：
1988
期刊：
--
影响因子：
--
作者：
N. Thom;S. Brown
通讯作者：
N. Thom;S. Brown
DOI：
10.1061/(asce)te.1943-5436.0000009
发表时间：
2009-03
期刊：
Journal of Transportation Engineering-asce
影响因子：
--
作者：
H. Rondón;T. Wichtmann;T. Triantafyllidis;A. Lizcano
通讯作者：
H. Rondón;T. Wichtmann;T. Triantafyllidis;A. Lizcano