摘要
含水率、围压、压实度、初始静偏应力和循环荷载作用频率是影响动弹性模量和阻尼比的重要因素,通过动三轴试验分析这些因素对砾类土动弹性模量和阻尼比的影响并得出了相关规律,围压和压实度越大,含水率越接近最佳含水率,动弹性模量越大,阻尼比越小。0~10 kPa范围的初始静偏应力对砾类土的动弹性模量和阻尼比影响较小。循环荷载作用频率在1~2 Hz变化时,砾类土的动弹性模量和阻尼比也变化较小。给出了砾类土的动弹性模量幂函数模型参数,得出不同条件时模型参数的变化规律。
Water content, confining pressure, compaction degree, the initial static deviatoric stress and cyclic loading frequency are important factors that affect the dynamic elastic modulus and damping ratio. The dynamic triaxial experiments were conducted to study the effects of these factors on the gravel soil dynamic elastic modulus and damping ratio, and then the laws were gotten. Dynamic elastic modulus is bigger and damping ratio is smaller when confining pressure and compaction degree is higher and moisture content is close to the optimal water content rate. Dynamic elastic modulus and damping ratio have fewer changes when the initial static deviator stress is changing from 0 kPa to 10 kPa. Dynamic elastic modulus and damping ratio also have little difference when cyclic loading frequency is changing from 1 Hz to 2 Hz. Power function models of dynamic elastic modulus of gravel soil were given and the change rules of parameters were gotten under different conditions.
作者
刘大鹏
杨晓华
刘恒任
王婧
张红伟
LIU Dapeng;YANG Xiaohua;LIU Hengren;WANG Jing;ZHANG Hongwei(Jiangsu Vocational Institute of Architectural Technology, Xuzhou 221116, China;School of Highway, Chang’an University, Xi’an 710064, China;China Railway Eryuan Enginerring Group Co. Ltd., Chengdu 610031, China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2017年第2期264-270,共7页
Journal of Railway Science and Engineering
基金
交通运输部西部交通建设科技资助项目(2011318797600)
江苏建筑职业技术学院校级科研项目(JYZRJJ-15-3)
江苏建筑职业技术学院高层次人才科研启动项目(JSJY003)
江苏省住建厅科技项目(2016ZD81)
关键词
砾类土
动三轴
动弹性模量
阻尼比
影响因素
gravel soil
dynamic triaxial test
dynamic elastic modulus
damping ratio
influence factors
