砂砾桩在高速公路湿陷性黄土地基处理中的应用

A dissertation on application of sand-gravel columns in collapsible loess ground treatment of expressway

某高速公路位于青海省东南部,沿线存在连续分布的深厚湿陷性黄土地层,需要进行路堤及构造物的地基处理以消除其湿陷性。根据当地工程地质条件和具体情况,对深度5~15 m的湿陷性黄土地基采用挤密桩处理。针对当地缺乏石灰、碎石而多砂砾的特点,决定采用砂砾挤密桩处理黄土地基。结合具体工程实例对砂砾挤密桩的地基处理方案进行了论述,为今后类似湿陷性黄土地基的处理提供参考。

A highway is located in the southeastern part of Qinghai Province. There are continuous collapsible loess formations along the line,which require embankment and foundation treatment to eliminate its collapsibility. According to the local engineering geological conditions and specific conditions,the depth of 5 ~ 15 m collapsible loess foundation is treated with compaction sand-gravel piles. In this paper,the foundation treatment scheme of sand-gravel piles is discussed in the light of specific engineering examples,which provides reference for the treatment of similar collapsible loess foundation in the future.