摘要
为研究引起隧道持续沉降的原因,通过拖球试验从流体力学角度研究地下软黏土在不同含水率、不同振动频率、不同围压条件下流动特性的变化情况。试验结果表明:软黏土的流动性随着含水率和振动频率的增加而增加,随着围压的增大而减小;增加含水率对软黏土流动性的促进作用,在较低含水率时较明显,随着土样含水率的逐渐升高而变得不再显著。围压和振动频率对软黏土的流动特性有交叉影响:在高振动频率下,围压的增加对软黏土的流动特性影响不大;在高围压下,只有当振动频率超过临界值时,振动频率的增加才会影响软黏土的流动特性。
Localized vibration caused by the metro operation changes the mechanical properties of underground soft clay, which can cause engineering geological problems, such as continuous subsidence of metro tunnels, but the mechanism is still unclear. In order to study the cause of tunnel’s continuous settlement, this paper studies the flow characteristics of underground soft clay under different water contents, vibration frequencies and confining pressures by the pulling sphere experiment. The experimental results indicate that the flow characteristics of soft clay increase with the increasing water content and vibration frequency, and decrease with the increasing confining pressure. However, the effect of increasing water content on the fluidity of soft clay is more obvious at lower water content, and becomes no longer significant with the gradual increase of water content of soil sample. Confining pressure and vibration frequency have cross-effects on the flow characteristics of soft clay. Under high vibration frequency, the confining pressure has little effect on the flow characteristics of soft clay. At presence of high confining pressure, the increase of vibration frequency will affect the flow characteristics of soft clay only if the vibration frequency exceeds a critical value.
作者
殷德顺
颜庆梅
马誉鑫
YIN Deshun;YAN Qingmei;MA Yuxin(College of Mechanics and Materials,Hohai University,Nanjing 211100,China;Jiangxi Building Materials Scientific Research & Design Institute,Nanchang 330000,China)
出处
《河海大学学报（自然科学版）》
CAS
CSCD
北大核心
2019年第4期366-373,共8页
Journal of Hohai University(Natural Sciences)
基金
国家自然科学基金(11872173)
关键词
拖球试验
含水率
局部振动
围压
软黏土
流动特性
试验研究
pulling sphere experiment
water content
localized vibration
confining pressure
soft clay
flow characteristics
experimental study
