结构性软黏土的循环累积应变特性研究  

STUDY ON CUMULATIVE STRAIN CHARACTERISTICS OF STRUCTURED SOFT CLAY

作　　者：陈峰 张金鑫 王能兴 贺波 张晗辉 CHEN Feng;ZHANG Jinxin;WANG Nengxing;HE Bo;ZHANG Hanhui(China United Engineering Co.,Ltd.,Hangzhou 310000,China)

机构地区：[1]中国联合工程有限公司,杭州310000

出　　处：《低温建筑技术》2023年第1期138-142,146,共6页Low Temperature Architecture Technology

摘　　要：针对动力作用下软黏土结构破坏而造成的变形问题,对杭州地区的原状软黏土进行了循环加载的动力特性试验。结果表明相同试验条件下,轴向应变在低有效固结围压、较低振动频率和较高动应力比作用下发展速率更快,且这三者存在耦合关系。综合考虑有效固结围压、振动频率以及动应力比的影响,建立了能够描述土样轴向累积变形的表达关系式。Aiming at the deformation problem caused by the damage of the soft clay structure under cyclic loading,the dynamic characteristics of the undisturbed soft clay in Hangzhou area are tested.The research results show that under the same test conditions,the axial strain develops faster under the action of lower effective consolidation confining pressure,lower vibration frequency,and higher dynamic stress ratio,with a coupling relationship among the three aspects.Considering the effects of effective consolidation confining pressure,vibration frequency,and dynamic stress ratio,an equation that express the cumulative axial deformation of the soil sample is established.

关 键 词：结构性 循环荷载 动应力比 振动频率 累积应变 

分 类 号：TU753[建筑科学—建筑技术科学]