摘要
以太原地铁项目现场原状土为基础,通过一系列不排水循环三轴试验,对太原砂-黄土重塑混合料的液化特性进行了试验研究.结果表明:黄土含量(Lc)对太原砂液化特性影响显著;在循环荷载作用下,太原砂-黄土混合料试样与太原砂试样液化破坏过程不同;混合料的液化强度(CRR)随着Lc的增加呈现非线性变化的规律;有效围压、动荷载频率、相对密度等因素均会对混合料CRR产生影响.最后根据试验数据提出了不同细粒含量混合料CRR评价模型.该模型适用性较好,可为工程实践提供参考.
A series of undrained cyclic triaxial tests of remodeling Taiyuan sand-loess mixtures with various loess content(Lc)were conducted to study the liquefaction behavior based on the soil from Taiyuan metro project.The test results show that the liquefaction behavior of Taiyuan sand is influenced significantly by Lc.The liquefaction process of the mixture samples is different from that of Taiyuan sand samples under cyclic load.The liquefaction resistance(CRR)of the samples changes non-linearly with the increasing of Lc.CRR of the samples can also be influenced by the effective confining pressure,the frequency of the dynamic load and the relative density.A new model is proposed for the evaluation of CRR of sand-fines mixtures under various fines content based on the test results.The model is in good applicability and can be reference for the engineering practice.
作者
程科
苗雨
彭涛
CHENG Ke;MIAO Yu;PENG Tao(School of Civil Engineering and Mechanics,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第7期83-87,共5页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(51978304,51778260)。
关键词
砂类土
不排水循环三轴试验
黄土含量
液化强度
评价模型
sandy soil
undrained cyclic triaxial test
loess content
liquefaction resistance
evaluation model
