地铁列车动荷载作用下饱和软黏土累积塑性应变计算模型研究*
- 摘 要
-
（1 铜陵学院建筑工程学院， 铜陵 244000； 2 同济大学道路与交通工程教育部重点实验室，上海 201804）
［摘要］针对宁波地区②层淤泥质黏土和④层黏土进行了竖向应力与水平应力比值K0分别为0.7,0.6固结下的动三轴试验。结果表明，该两层土的累积塑性应变与振次成指数关系，振动频率对其累积塑性应变存在一定影响。在既有累积塑性应变计算模型基础上，通过引入等效系数δ将最小动偏应力qds等效为循环动应力的一部分，建立了考虑最小动偏应力影响的饱和软黏土累积塑性应变计算模型，并利用试验数据验证了此模型的适用性。［关键词］地铁; 动荷载; 饱和软黏土; 累积塑性应变中图分类号：TU435 文献标识码：A 文章编号：1002-848X(2015)21-0085-04
Study on the accumulative plastic strain calculation model of saturated soft clay under subway dynamic loadsSun Yuyong1, Zhou Shunhua2, Xiao Hongju1(1 College of Civil Engineering, Tongling University, Tongling 244000, China; 2 Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai 201804, China)Abstract: Based on the slit clay soil layer ② and clay soil layer ④ in Ningbo region, the dynamic triaxial tests were conducted under the consolidation in which the ratio K0 of vertical stress and horizontal stress is 0.7 and 0.6 respectively. The results show that the relationship between accumulated plastic strain and vibration of the two soil layers is exponential and vibration frequency has certain influence on accumulated plastic strain. Based on the existing cumulative plasticstrain calculation model and the introduction of the equivalent coefficient δ to make minimum dynamic deviator stress qds equivalent to part of cyclic dynamic stress, the cumulative plastic strain calculation model for saturated soft clay was set up considering the influence of the minimum dynamic deviator stress. The applicability of the cumulative plastic strain model was verified by the experimental results.Keywords: subway; dynamic load; saturated soft clay; accumulative plastic strain
*国家博士后基金资助（2013M541827），安徽省教育厅高校自然科学研究重点项目（KJ2015A176），安徽省自然科学基金资助（1408085ME98）。作者简介：孙玉永，博士后，副教授，Email：sunyuyong2@126.com。
