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| 1 | Creep behavior of EPS composite soil显示文摘EPS composite soil is one type of premixed lightweight fills studied by numerous researchers.However,one aspect that has not been fully understood is the creep behaviors which may have significant effect on the design and application of EPS composite soil.In this paper,the results of a series of oedometer creep tests and triaxial undrained creep tests on EPS composite soil were presented.Four main influencing factors were identified and their effects on the creep behaviors of EPS composite soil were studied.Three well established creep models,namely,Findley model,Singh & Mitchell model,and Mesri model,were used to simulate the creep behavior of EPS composite soil.This study shows that the Findley creep model fits the test results the best.A semi-empirical creep model was also proposed to model the creep behavior under axisymmetric conditions.In this model,the creep strain was divided into instant and viscous elastic strain as well as instant and viscous plastic strain which were simulated by element models and empirical equations,respectively.It was shown that the proposed creep model was able to precisely predict the creep strain of EPS composite soil. | GAO HongMei CHEN YuMin LIU HanLong LIU JinYuan CHU Jian | 2012 | Science China(Technological Sciences)2012，55，11： | 7 |
| 2 | 正弦波下砂岩ms级损伤预测模型显示文摘为获得毫秒(ms)级正弦波损伤变量预测模型,对岩样在不破坏情况下进行了不同波形不同频率的轴向力加卸载试验。提出了不同步时间段的定义,进而获得不同峰值荷载下不考虑不同步时间条件下的动态泊松比分别与即时荷载、即时横向长度、即时轴向高度之间的线性关系,从而得到线性关系中系数与峰值荷载间的拟合公式,即可联立不同已知条件,通过少量几个加载力峰值下的试验数据,对任意峰值荷载下动态泊松比与相关参数间的线性关系进行预测。以此为基础研究得到,在误差允许的范围内,采用动态泊松比与即时横向长度的线性关系,推导出体积应变、损伤变量的计算公式和方法,可以很好地对加卸载过程中岩样的体积应变、损伤的变化做出ms级的精确预测,也为在已知少量循环试验下获得岩石动态参数,即可对ms级的损伤进行精确预测的模型提供了方法。 | 刘杰 谢晓康 兰俊 高素芳 高进 王飞 | 2020 | 长江科学院院报2020，37，1： | 0 |
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