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针对公路因开挖而出现的路基水分失衡现象,在张家口—涿州高速公路工程选取试验段埋设温度和电阻传感器,测试不同挖方深度路段(深挖、浅挖和填挖过渡段)路基在开挖渗沟前后不同深度处的电阻率;通过室内试验建立电阻率和含水率之间的关系,分析了挖方路段路基水分迁移特性。分析表明:随着挖方深度的增加,深秋与初春的含水率差值△W不断增大,即在挖方边坡水分补给和温度共同作用下,水分迁移的强度随着挖方深度的增加越来越强烈;渗沟和一定深度的换填有助于抑制挖方路段水分迁移作用,改善路基工作状态;对比填挖过渡段和深挖方路段季节性水分迁移,夏季降水对2处路段影响显著,所测土基含水率较之其他季节明显增大,季节性因素对深挖方路段水分迁移强于填挖过渡段。
In view of the imbalance of subgrade moisture caused by excavation, the temperature and resistance sensors are embedded in the test section of Zhangjiakou-Zhuozhou Expressway to test the excavation of subgrade with different excavation depths (deep excavation, shallow excavation and filling-excavation transition) The resistivity at different depths before and after the infiltration ditch; the relationship between the resistivity and the water content was established through laboratory tests, and the water migration characteristics of the embankment at the excavation section were analyzed. The analysis shows that with the increase of excavation depth, the difference of water content △ W in late autumn and early spring increases continuously. Under the combined effect of water supply and temperature, the water migration intensity increases with the increase of excavation depth Strong; The infiltration of furrows and the replacement of a certain depth can help to restrain the migration of water in the excavation section and improve the working status of the subgrade. Comparing the seasonal water migration in the section of filling and excavation and deep excavation, the summer precipitation has a significant impact on the two sections. The moisture content of soil foundation significantly increased compared with other seasons, seasonal factors on the deep excavation of the road section of water migration is stronger than the filling and excavation transition section.