摘要
毛细水上升会引起路基含水率变化,进而影响路基边坡稳定性.因此,设计制作3个坡度变化的路基模型,填筑开封粉砂土,边坡采用未处理、硬化及绿化3种工况,进行毛细水上升实验,研究毛细水上升高度、速度,分析毛细水上升引起的土的含水率变化;建立有限元模型,分析不同工况时含水率对路基竖向位移的影响.实验表明:坡度1∶1.8路基毛细水上升高度最低,土的含水率最小;毛细水作用下,边坡硬化及绿化后土的含水率变大,而未处理边坡土的含水率最小.数值分析表明:路基竖向位移随着含水率的增大而增大;在含水率小于15%时坡度1∶1.8的路基竖向位移最小,在含水率大于18%时坡度1∶2的路基竖向位移最小.总之:毛细水对坡度1∶1.8的路基含水率影响较小,此时路基竖向变形最小.
The water ratio of subgrade changes with the capillary water rising,which will affect the stability of subgrade slope.Therefore,three types of subgrade models with different slopes were designed and constructed,which was filled with the silt soil from Kaifeng.Three kinds of working conditions,such as untreatment,hardening and greening,were set for the tests.The capillary water experiments were carried out to study the rising heights and speeds.Moreover,the variations of water contents caused by capillary water were discussed.The finite element model was established to analyze the influence of moisture content on the vertical displacement of subgrade in different working conditions.The experiment results show that the rising height of capillary water,in the subgrade with a gradient of 1∶1.8,is the lowest,and the water ratio of silt soil is minimal.Due to capillary water rise,the water ratios of soil in hardening and greening slope become larger,and those in untreatment are minimal.Numerical analysis shows that the vertical displacement of subgrade increases with the increase of water content.When the moisture content is less than 15%,the vertical displacement of the subgrade with a slope of 1∶1.8 is the minimum.However,when the water ratio is more than 18%,the vertical displacement of the subgrade with a gradient of 1∶2 is minimum.To sum up,the water ratio of the subgrade with a slope of 1∶1.8 is a little affected by the capillary water;meanwhile,the minimum vertical deformation of the subgrade is obtained.
作者
袁玉卿
王晶晶
王祎沛
张业
张峰
李慧斌
郑万洲
YUAN Yuqing;WANG Jingjing;WANG Yipei;ZHANG Ye;ZHANG Feng;LI Huibin;ZHENG Wanzhou(Henan University Laboratory for Recycled and Functional Building Materials,Henan Kaifeng475004,China;Henan University School of Civil Engineering and Architecture,Henan Kaifeng475004,China)
出处
《河南大学学报（自然科学版）》
CAS
2019年第2期218-226,共9页
Journal of Henan University:Natural Science
基金
河南省科技发展计划项目(162102210026)
河南大学省校区合作奖励补助资金项目(2016S12)
开封市科技发展计划项目(1602014)
关键词
道路工程
粉砂土
毛细水
模型实验
数值模拟
路基工程
边坡
稳定性
road engineering
silty soil
capillary water
model test
numerical simulation
subgrade engineering
slope
stability
作者简介
袁玉卿(1972-),男,河南洛阳人,博士,教授.研究方向:道路工程.E-mail:yroad@126.com
