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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 heaving effect of the refill method in the alpine valley area, a reasonable replacement depth of the soft soil subgrade is given through numerical simulation and set at K18 + 100 ~ K18 + 400 of Dangchang ~ Diego Section II Highway Three kinds of test sections with different replacement depths were monitored, and temperature and pavement deformation data were monitored. The results show that the maximum season freezing depth of 1.86m after replacing 1m with tunnel spoil is larger than the seasonal freezing depth of 1.68m without replacing embankment. During the cold season, soil under the embankment after refilling process started to freeze earlier. The deformation of the road surface with 2m of replacement has less fluctuation, and no obvious frost heave occurs. The deformation of the road surface without replacement is dominated by frost heave deformation. The method of using tunnel spoil to replace original natural foundation has good anti-frost heaving effect in the treatment of soft foundation in the alpine valley area, which can provide reference for subsequent construction.