两徽高速公路软土地基管桩处理设计研究

Study on Design of Soft Soil Foundation Pipe Pile Treatment for Lianghui Expressway

新建两徽高速公路地处甘肃省陇南秦巴山区东部,南北两侧均为秦岭,项目区地形为崇山峻岭与河谷盆地相间。路线经过厚层冲积淤泥质土(软土)分布区,局部淤泥质土层中夹有冲积砂砾层,软土路基不均匀沉降控制是需要解决的重要问题。对此,从地基承载力、地基沉降、施工可行性等方面进行研究,并经多方案比选,确定采用高强度预应力混凝土管桩对软土地基进行处理,施工后地基满足工后沉降控制要求。

The newly-built Lianghui expressway is located in Longnan of Gansu province, east of Qinba mountain area and both the north and south sides are passed by Qinling mountains.The terrain is alternating berwern with mountains and river valleys in the project area. The route goes through the distribution area of thick alluvial silty soil(soft soil). Alluvial sand and gravel layer is sandwiched in local silty soil layer. The control of uneven settlement of soft soil subgrade is an important problem to be solved. Hence, the high strength prestressed concrete pipe pile was adopted to treat the soft soil foundation based on the study of the foundation bearing capacity, foundation settlement, construction feasibility, etc. and through the selection of multiple schemes. The fourdation meets the requirements of post-construction settlement control after construction.