长沙地区典型砂卵石土动力参数计算模型研究  

Study on dynamic parameter calculation model of typical sandy pebble soil in Changsha area

作　　者：王薇[1] 高棱韬 赵东 朱可越 张学民[1] WANG Wei;GAO Lengtao;ZHAO Dong;ZHU Keyue;ZHANG Xuemin(School of Civil Engineering, Central South University, Changsha 410075, China;Beijing Urban Engineering Design and Research Institute Co., Ltd., Beijing 100000, China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]北京城建设计发展集团股份有限公司,北京100000

出　　处：《地震工程与工程振动》2018年第3期110-117,共8页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金资助项目(51378505);湖南省科技计划项目(2010GK3173);2018年度湖南省自然科学基金项目(2018JJ2519)~~

摘　　要：为研究长沙地区典型砂卵石土动力参数计算模型,基于大型动三轴试验,研究了围压、固结应力比及振动频率对砂卵石土动应力—动应变关系的影响,结合动参数模型及试验数据拟合出砂卵石土动弹性模量及阻尼比的经验公式,研究结果表明:围压对砂卵石土动本构关系影响显著;固结应力比大于1.0时,初始剪应力存在对砂卵石土的动强度增加不利;振动频率试验数据表现出良好的归一性,对砂卵石土动本构关系影响小;砂卵石土动力参数经验公式具有良好的可靠性。To study the parameters of typical sandy pebble soil dynamic calculation model in Changsha area,based on the large-scale dynamic triaxial test,the influence of confining pressure,consolidation stress ratio and vibration frequency on the dynamic stress-strain relationship of sandy pebble soil is studied,and combined with dynamic parameter model and test data,the experimental formula of the dynamic elastic modulus and damping ratio of sand pebble soil is fitted,the results show that: the confining pressure has a significant effect on the dynamic constitutive relation of sand and pebble soil. When the consolidation stress ratio is more than 1. 0,the existence of initial shear stress is not favorable for the increase of the dynamic strength of sandy pebble soil,the vibration frequency test data show good normality,and the dynamic constitutive relation of sandy pebble soil is small. The empirical formula based on dynamic parameters of sandy pebble soil has good reliability.

关 键 词：砂卵石土 动三轴试验 动本构关系 动力参数 计算模型 

分 类 号：TU411.8[建筑科学—岩土工程]