填土高度对冻融区填石通风路基沉降变形的影响分析  

Impact Analysis of Earth-filling Height on the Settlement Deformation of Rock-filled Ventilation Roadbed in Freeze-thaw Zone

作　　者：王正伟 文良 丁延明 张明喜 黄维蓉 张盟田 任海生 Wang Zhengwei;Wen Liang;Ding Yanming;Zhang Mingxi;Huang Weirong;Zhang Mengtian;Ren Haisheng(Xinjiang Road&Bridge Nanjiang Engineering Construction Co.,Ltd.,Kashi 844099,Xinjiang,China;School of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Chongqing Juneng Construction Group Co.,Ltd.,Chongqing 401120,China;Intelligent Transport System Research Center,Southeast University,Nanjing 211189,China)

机构地区：[1]新疆路桥南疆工程建设有限公司,新疆喀什844099 [2]重庆交通大学材料科学与工程学院,重庆400074 [3]重庆巨能建设(集团)有限公司,重庆401120 [4]东南大学智能运输系统研究中心,南京211189

出　　处：《科技通报》2024年第8期68-73,共6页Bulletin of Science and Technology

基　　金：新疆交通科技项目(E1230043)。

摘　　要：本文针对新藏公路高海拔冻融区填石通风路基不均匀沉降病害频发问题,充分考虑该地区气温、太阳辐射、风速以及“阴阳坡”等边界条件,建立热-力耦合有限元数值模型,研究了填土高度分别为0.5、1.5、3.5 m时,填石通风路基的沉降特性。结果表明:冻融区道路不同位置温度场存在较大差异,阳坡侧温度全年最高,温度远高于其他位置,天然地面与阴坡侧温度较低。提高填石通风路基上侧填土高度能够改善道路前期沉降问题,如3.5 m填土高的路基沉降差仅为0.5 m填土高的1/3倍,对应的横向沉降差仅为1.16 m,但过高的填土由于“阴阳坡”效应易导致路基产生较大的不均匀沉降。In response to the frequent occurrence of uneven settlement diseases in the high-altitude freeze-thaw zone of the Xinjiang-Tibet Highway.A thermal-mechanical coupled finite element numerical model was established by taking into account boundary conditions such as temperature,solar radiation,wind speed,and"sunny-shady slope".The settlement deformation characteristics of the rock-filled ventilation roadbed were studied when the filling heights were set as 0.5 m,1.5 m,and 3.5 m,respectively.The results indicate that there are significant differences in the temperature field at different locations of roads in the freeze-thaw zone.The highest temperature on the sunny slope side throughout the year is much higher than other locations,and the temperature on the natural ground and the shaded slope side is lower.Increasing the height of the earth-filling on the upper side of the ventilation roadbed can improve the settlement problem in the early stage of the road.For example,the roadbed settlement difference of a 3.5 m earth-filling is only 1/3 times that of a 0.5 m earth-filling,and the corresponding lateral settlement difference is only 1.16 m.However,excessive earth-filling height can easily cause significant uneven settlement of the roadbed due to the"sunny-shady slope"impact.

关 键 词：填土高度 填石通风路基 数值模拟 沉降变形 阴阳坡 

分 类 号：U416[交通运输工程—道路与铁道工程]