季节冻土区黄土路基水分与温度变化规律研究  

Research on the moisture and temperature variation of loess roadbed in seasonally frozen ground regions

作　　者：毛云程[1,2] 李国玉[1] 张青龙[1,2] 张坤[1,2] 穆彦虎[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州730000 [2]甘肃省交通科学研究院有限公司,甘肃兰州730050

出　　处：《冰川冻土》2014年第4期1011-1016,共6页Journal of Glaciology and Geocryology

基　　金：交通运输部西部交通建设科技项目(200831800025);甘肃省科技重大专项计划项目(143GKDA007);冻土工程国家重点实验室青年基金项目(SKLFSE-ZQ-20);冻土工程国家重点实验室开放基金项目(SKLFSE201107);中国科学院"西部之光"重点项目资助

摘　　要：为研究季节冻土区压实黄土路基变形的影响因素,通过现场监测得到路基水分场与温度场的变化规律,并结合室内试验与数值模拟分析路基变形规律.结果表明,天然地面以上路堤土体具有明显的季节性,水分场及温度场变化剧烈,而天然地面以下土体温度场及水分场变化较平缓,季节性不强.路堤最大冻深约1 m,经历强烈的冻融循环和干湿交替过程,含水率变化量为5%-29%.冻融循环作用在路肩处产生的变形较大,而干湿循环作用在路基中心处产生的变形较大,且后者引起的变形大于前者.In order to resolving the issue of compacted loess roadbed deformation in seasonally frozen ground re- gions, the variations of temperature and moisture of subgrade were studied on the base of in-situ monitoring. And then, the principal factors of roadbed deformation were analyzed in combination of laboratory test data and numerical simulation. It is found that temperature and moisture have a significant seasonal variation, which per- forms greatly within the embankment above the original ground surface, and not obvious under the original ground surface. The maximum frost depth in the embankment is about 1 m, along with strong freezing-thawing and dry-wet alternations. Water content varies between 5% and 29%. The deformation caused by freezingthawing cycles on shoulder is larger than that in the middle of roadbed. However, the settlement due to dry-wet cycles is smaller in shoulder. The deformation due to dry-wet cycles is larger than that due to freezing-thawing cycles.

关 键 词：季节冻土区 冻融循环 干湿循环 黄土路基 

分 类 号：U416.1[交通运输工程—道路与铁道工程]