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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第14卷    第2期    总第83期    2017年2月

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文章编号:1672-7029(2017)02-0264-07
砾类土动弹性模量和阻尼比的影响因素试验研究
刘大鹏1,杨晓华2,刘恒任1,王婧1,张红伟3

(1. 江苏建筑职业技术学院,江苏 徐州 221116;2. 长安大学 公路学院,陕西 西安 710064;
3. 中铁二院工程集团有限责任公司,四川 成都 610031
)

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。

 

关键字: 砾类土;动三轴;动弹性模量;阻尼比;影响因素

Experimental study on influence factors of gravel soil dynamic elastic modulus and damping ratio
LIU Dapeng1, YANG Xiaohua2, LIU Hengren1, WANG Jing1, ZHANG Hongwei3

1. Jiangsu Vocational Institute of Architectural Technology, Xuzhou 221116, China;
2. School of Highway, Chang’an University, Xi’an 710064, China;
3. China Railway Eryuan Enginerring Group Co. Ltd., Chengdu 610031, China

Abstract: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.

 

Key words: gravel soil; dynamic triaxial test; dynamic elastic modulus; damping ratio; influence factors

ISSN 1672-7029
CN 43-1423/U

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