季冻区公路路基冻害监测及分析

Monitoring and Analysis of Highway Roadbed Freezing Damage in Seasonal Freezing Region

以国道109线那曲段工程项目为依托,通过监测及数据分析,分析那曲地区公路路基冻害的发育规律,并通过对路基土温度、含水率及冻胀量时程曲线分析,明确了路基土冻胀变形的阶段性变化规律,验证了路基中心位置防冻措施的有效性;坡面走向的阴面(路基右坡脚)受冻害影响更大,该区域类似走向的道路设计中应着重考虑阴阳坡效应。

Based on the project of Naqu section of National Highway 109, through monitoring and data analysis,the development regularity of roadbed freezing damage in Naqu region was analyzed. Through the analysis of subgrade soil, moisture content, the time-history curve of frost heaving, the frost heaving deformation process of subgrade soil was clarified, and effectiveness of anti-freezing measures in the center of rodebed was verified. The shady side of the slope(the slope toe of the right embankment) is more affected by freezing damage, and the Yin and Yang slope effect should be considered in the design of roads with similar trend in this area.