摘要
为了研究换填法在高寒沟谷区的防冻胀效果，通过数值模拟，给出了软土路基合理的换填处理深度，并在宕昌～迭部二级公路K18＋100-K18＋400段设置了3种不同换填深度的试验段，对温度及路面变形数据进行了监测。结果表明：采用隧道弃渣换填处理1m后的最大季节冻结深度为1．86m，大于未换填路基下的季节冻结深度1．68m。在冷季期间，经过换填处理的路基下部土体较早开始冻结。换填2m的路面变形具有较小波幅的波动，未见明显的冻胀发生；未换填的路面变形则以冻胀变形为主。利用隧道弃渣换填原天然地基的方法在高寒沟谷区软基处置中具有良好的防冻胀效果，可为后续的施工提供参考。
In order to study the anti-frost heave effect of the replacement method in the gully soft foundation of highway in the alpine cold areas, a reasonable replacement depth is determined by numerical simulation. Three test cross-sections are set up on G212 Tanchang to Diebu section （K18＋ 100-K18 ＋ 400）. The ground temperature, water content and deformation of road are monitored. Results show that the maximum frozen depth is 1. 86m with a replacement depth of 1 m, which is larger than that of the nature ground. In the cold season, the roadbed with replacement depth is earlier to freeze. With a replacement depth of 2 m, the roadbed deformation has a smaller fluctuations and no obvious frost heave occurred. The section without any replacement is given priority to with frost heave. All the results indicate that the replacement method in the gully soft foundation in the alpine cold areas has a good anti-freeze effect. The results can provide some reference for similar projects in future.
出处
《公路》
北大核心
2015年第12期15-24,共10页
Highway
基金
国家科技支撑计划项目
项目编号2014BAG05B05
国家自然科学基金创新群体项目
项目编号41121061
甘肃省交通运输厅科研项目
项目编号2012-09
关键词
高寒地区
软土路基
冻胀变形
温度场
数值分析
alpine cold districts
gully soft foundation
frost heave deformation
temperature field
numerical simulation
