多年冻土区路桥过渡段变形及地温场试验多年冻土区路桥过渡段变形及地温场试验.pdfVIP

第 20 卷 第 4 期 中 国 公 路 学 报 Vol. 20 No. 4 2007 年 7 月 China Journal of Hig hw ay and T ransport July 2007 文章编号: 10017372( 2007) 040019 06 多年冻土区路桥过渡段变形及地温场试验 田亚护, 刘建坤, 彭丽云 ( 北京交通大学 土木建筑工程学院, 北京 100044) 摘要: 根据多年冻土区路桥过渡段路基在竣工后 3 a 内的现场试验数据, 分析了路基不同位置的地 温变化、路基基底沉降变形和路基不同位置沿横向及纵向的沉降变形规律。结果表明: 采用粗颗粒 土填筑的过渡段路基对多年冻土区土体有明显的冷却效果, 可防止多年冻土上限的下降; 路基阳坡 的沉降大于阴坡, 而沿路基纵向, 距离桥台越远路基沉降越大, 但路基沿横向和纵向的沉降均满足 工程要求; 这种粗颗粒土填筑的路桥过渡段可适用于多年冻土区。 关键词: 道路工程; 路桥过渡段; 试验研究; 沉降变形; 多年冻土; 土体温度 中图分类号: U 416. 168 文献标志码: A Experiment on Ground Temperature Field and Deformation of Bridgesubgrade Transition Section in Permafrost Regions T IAN Yahu, LIU Jiankun, PENG Liy un ( School of Civ il Eng ineering and Architect ure, Beijing Jiaoto ng U niversity, Beijing 100044, China) Abstract: Accor ding to the field test data of the bridg esubgrade transition section in perm afro st reg ions during 3 y ears after the co nstr uctio n, the g round temperature variation inside different locations of subgrade and the settlement defo rmatio n rules of subgrade basement and subgrade in different locations o f the cross and the long itudinal sectio n w ere analyzed. T he r esults show that the co oling effect of so il under g round is obvious and the decline of permafrost upper limit may be restrained by the abutment filled w ith coarse g rained soil. In the cross section o f subgr ade, the settlement of the southern slope is larg er than that of the northern slope. T he settlement of subg rade in the lo ng itudinal section increases w ith the increasing distance aw ay f