多年冻土区片石护坡路基热稳定性的分析  

Analysis of embankment with riprap slope protection thermal field in cold and arid regions

作　　者：孙文[1] 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《中国建材科技》2012年第2期64-67,共4页China Building Materials Science & Technology

基　　金：国家自然基金项目(50678076);国家十一五科技发展支撑计划重点项目(2006BAC07B02)

摘　　要：为研究片石护坡对冻土路基稳定性的影响,建立了冻土路基温度场的三维数值计算模型,并采用有限元方法对普通路基、片石护坡路基在未来50年内气温上升2.6℃情况下的温度场进行了预报分析和比较。计算结果表明:路基阴阳坡的热差异会导致路基下伏土层温度场不对称,由此可引起路基横向的不均匀变形;在气温升高条件下,未来50年内普通路基将会产生较大融沉变形,片石护坡路基融化深度均小于普通填土路基的融化深度,阴阳坡温度差异也有明显降低。随着时间的推移,片石护坡路基对于提升冻土上限起到了一定作用。片石护坡对路基左侧、右侧的上限抬升幅度存在差异,路基左侧0℃等温线的抬升相对于右侧的上升幅度小。In order to study the impact of slope protection with rubble over frozen roadbed stability,3-D numerical value calculation model of the frozen roadbed thermal field was built and finite element method was adopted to predict and compare the thermal field of general and slope protection with rubble roadbed by rising 2.6℃ in the coming 50 years. The results show that the thawing depth of slope protection with rubble is smaller than that of general roadbed. As time goes on, slope protection with rubble plays a certain role in promoting the upper limit of roadbed permafrost. Slope protection with rubble plays a different role in promoting the upper limit of right roadbed and left roadbed, uplifting range of left roadbed in 0℃ isotherm is smaller than the right roadbed,the mainly reason is that left roadbed generate more heat from acceptting the sun radiation than the right side.

关 键 词：多年冻土 路基 稳定性 数值分析 

分 类 号：U213.14[交通运输工程—道路与铁道工程]