摘要
为探究循环荷载对冻结粉质黏土动力学参数的影响,利用GDS动态三轴试验系统,对不同振次作用下冻结粉质黏土的黏聚力、内摩擦角、动弹性模量、阻尼比等展开试验研究。结果表明:随着振动次数的增加,土体黏聚力降低,当振动次数达到12次时,土体黏聚力基本不再随振动次数的增加而变化。内摩擦角随着振动次数的增加先增大,当振次达到12次时内摩擦角达到峰值,随后开始减小。振动次数越多,土体达到同一动应变所需的应力越小。随着动应变幅值的增加,土体的动弹性模量和动模量比均减小。在同一应变幅值下,动弹模量与振次成反比关系,动模量比与振次成正比关系。初始动弹性模量随着振动次数的增加而减小。在同一应变幅值下,阻尼比随着振动次数的增加而增大。研究结果可为寒区工程建设过程中动力参数的选取提供理论指导与参考。
In order to explore the influence of cyclic load on the dynamic parameters of frozen silty clay,the GDS dynamic triaxial test system is used to study the cohesion,internal friction angle,dynamic elastic modulus and damping ratio of frozen silty clay under different vibration times.The results show that with the increase of vibration times,the cohesion of soil decreases.When the vibration times reach 12 times,the cohesion of soil basically no longer changes with the increase of vibration times.The internal friction angle increases first with the increase of the number of vibrations.When the number of vibrations reaches 12,the internal friction angle reaches a peak and then begins to decrease.The more the number of vibrations,the smaller the stress required for the soil to achieve the same dynamic strain.With the increase of dynamic strain amplitude,the dynamic elastic modulus and dynamic modulus ratio of soil decrease.Under the same strain amplitude,the dynamic elastic modulus is inversely proportional to the vibration times,and the dynamic modulus ratio is proportional to the vibration times.The initial dynamic elastic modulus decreases with the increase of vibration times.Under the same strain amplitude,the damping ratio increases with the increase of vibration times.The research results can provide theoretical guidance and reference for the selection of dynamic parameters in the process of engineering construction in cold regions.
作者
孙超
李金明
郭浩天
茆欣
Sun Chao;Li Jinming;Guo Haotian;Mao Xin(School of Geometrics and Prospecting Engineering,Jilin Jianzhu University,Changchun 130118,China)
出处
《建筑科学》
CSCD
北大核心
2024年第7期66-73,共8页
Building Science
基金
吉林省科技发展计划项目(YDZJ202201ZYTS490)
第七届中国科协青年人才托举工程(2021QNRC001)。
关键词
循环荷载
粉质黏土
动力学参数
动三轴试验
动弹性模量
阻尼比
cyclic loading
silty clay
kinetic equation parameter
dynamic triaxial test
dynamic elastic modulus
damping ratio
