摘要
自然边坡存在初始剪应力,地震波双向振动存在相位差,两者对边坡砂土的动力特性都有影响。利用GCTS双向动三轴测试系统实现对初始剪应力和相位差的控制,研究了饱和砂土动剪切模量和阻尼比的变化规律。结果表明:在一定范围内,随着初始剪应力和相位差的增大,土体趋向于更稳定的状态,变形幅值减小,最大动剪切模量增大,最大增幅达125%;初始剪应力对阻尼比有放大效应,但相位差对其影响较为复杂;两者的耦合作用对最大动剪切模量的影响是比较显著的,根据试验结果得到了该条件下的最大动剪切模量经验预测公式。
The initial shear stress in natural slope and the phase difference of seismic wave both have effect on soil dynamic properties. The regularity of dynamic shear modulus and damping ratio of saturated sand under control of initial shear stress and phase difference are studied by controlling both of them with GCTS bidirectional dynamic triaxial testing system. The results show that the maximum dynamic shear modulus increases with the increase of initial shear stress and phase difference with a maximum 125% increment, so the soil tends to be a more stable; the initial shear stress has an amplifying effect on the damping ratio, while the effect of phase difference on damping ratio is complicated ; coupling effect of them on Gmax. is more significant, and the empirical prediction formula is derived based on the experimental results.
作者
张振华
黄向春
毕庆涛
黄志全
贾景超
吴超
ZHANG Zhenhua HUANG Xiangchun BI Qingtao HUANG Zhiquan JIA Jingchao WU Chao(School of Resources and Environment, North China University of Water Conservancy and Electric Power, Zhengzhou 450011, China Xinjiang Institute of Engineering, Urumqi 830023, China)
出处
《人民长江》
北大核心
2017年第3期70-74,共5页
Yangtze River
基金
河南省科技创新人才计划(154100510006)
河南省重点科技攻关项目(152102210111
132102210113)
新疆自治区高层次人才引进工程
华北水利水电大学研究生教育创新计划基金(YK2015-11)
关键词
双向动三轴
初始剪应力
相位差
动剪切模量
阻尼比
bidirectional dynamic triaxial
initial shear stress
phase difference
dynamic shear modulus
damping ratio
