季节冻土区黄土路基水分与温度变化规律研究

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.

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

In order to resolving the issue of compacted loess roadbed deformation in seasonally frozen ground regions, 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 performs 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 freezing-thawing 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.