摘要
基于冻土路基温度场数值模型,结合室内模型试验,对保温隔水路基进行热-应力耦合计算,并用试验结果验证计算模型,旨在研究普通路基与保温隔水路基在环境温度变化时路基温度场和位移场的变化规律,对比评价保温隔水路基防冻胀效果。结果表明:相比普通路基,保温隔水路基保温效果明显,其冻结时间推迟约22%,冻胀速率减小60%,冻胀量减小35%~60%。此外,保温隔水路基竖向变形相对较小,变形过渡平缓,横向变形显著减小,由变形引起的破坏作用减弱,说明保温隔水路基是一种较好的防冻胀路基结构。
Based on the numerical simulation of frozen soil embankment temperature field and combined with laboratory model test,the coupled thermal and stress calculation of heat insulation-water proof embankment was carry out,then experimental results were used to verify the calculation model. The aim was to investigate the variation characteristics of the temperature field and displacement field of the ordinary and heat insulation-water proof embankments in case of external temperature changing. Compared to the ordinary embankment,the results showed that the freezing time of the heat insulation-water proof embankment delayed about 22%,the frost heave rate reduced by 60 % and the frost heave amount reduced by 35% ~ 60%. The vertical deformation of the new embankment was smaller and smooth,the transverse deformation was significantly reduced as well. Therefore,the damage due to deformation will be diminished. So it is a better anti-frost embankment.
作者
张文清
李承成
刘德仁
杨成
牛亚强
ZHANG Wenqing, LI Chengcheng, LIU Deren, YANG Cheng, NIU Yaqiang(School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Chin)
出处
《冰川冻土》
CSCD
北大核心
2017年第6期1258-1264,共7页
Journal of Glaciology and Geocryology
基金
冻土工程国家重点实验室开放基金项目(SKLFSE201607)资助
关键词
冻土路基
模型试验
冻胀
热-力耦合
数值模拟
frozen soil embankment
model test
frost heave
coupled thermal and stress
numerical simulation
