多年冻土地区宽幅公路路基稳定性模拟  

Simulation on Stability of Large-width Highway Embankment in Permafrost Regions

作　　者：田亚护[1] 房建宏[1,2] 沈宇鹏[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]青海省交通科学研究所,青海西宁810008

出　　处：《中国公路学报》2015年第1期17-23,共7页China Journal of Highway and Transport

基　　金：国家重点基础研究发展计划("九七三"计划)项目(2012CB026104);国家自然科学基金项目(41271072);中央高校基本科研业务费专项资金项目(2011JBZ009);多年冻土地区公路建设与养护技术交通行业重点实验室青海研究观测基地开放基金项目(20121208)

摘　　要：为研究多年冻土地区宽幅高等级公路路基的稳定性,采用拉格朗日法描述的大变形固结理论及具有相变的传热理论,对G214（共和至玉树）高等级公路中不同宽度和高度路基的温度场和融沉变形进行了数值计算。结果表明：当路面宽度从12m增加到24m时,2-6m高路基中心位置冻土上限埋深增大3-6倍;随着路面宽度的增加,黑色沥青路面的热聚集效应和路基中心下冻土的融沉变形都显著增大;当路基高度为3m时,路基竣工50年后12,24m宽路基的中心和路肩位置沉降变形差值分别约为130,59mm;当路面宽度为12m时,路基中心与路肩位置的沉降值之差随路基高度增加而减小,当路面宽度为24m时则相反,且路基更易产生纵向裂缝。In order to study the stability of large-width highway embankment in permafrost regions, numerical computations of thermal regimes and thawing settlements of G214 highway （Gonghe County to Yushu City） embankments with various widths and heights were conducted by combining large strain consolidation theory with Lagrangian description and thermal conduction equation with phase change. The results show that when the width of pavement varies from 12 m to 2zL m, the permafrost table depth will increase by 3-6 times at the center of embankment of 2-6 m in height. The wider the pavement is, the more obvious the effect of thermal aggregation on asphalt pavement is and the larger the thawing settlement of permafrost beneath embankment center is. When the height of embankment is 3 m, the settlement differences of centers and shoulders between pavement of 12 m and 24 m in width are 130 mm and 59 mm after 50 years of construction respectively. For the pavement of 12 m in width, the higher the embankment, the less the settlement difference between the center and shoulder, however, for the pavement of 24 m in width, it is opposite and the longitudinal embankment crack will occur easily.

关 键 词：道路工程 宽幅公路路基 数值模拟 融化固结 大变形理论 

分 类 号：U416.1[交通运输工程—道路与铁道工程]