陡坡地形处桥梁深基坑开挖技术研究

Technology Research on Bridge Deep Foundation Pit Excavation in Steep Slope Topography

对陡坡地形上的桥梁基坑来讲,一般都是临河或是临路。现在的环保要求,不允许向下溜碴,从上向下逐级开挖,势必需要修建多条水平出碴便道,而陡坡地形不具备平行修建多条便道的条件,经多次研究论证,并经南盘江特大桥两大拱座基坑开挖实践验证,总结出一套实用、高效的陡坡地形上深基坑的开挖方法,为类似工程提供借鉴。

Foundation pits of the steep slope terrains are generally adjacent to rivers or roads. All of the projects are not allowed to slip down muck according to the environmental protection requirements. It is necessary to build a number of horizontal service roads for transporting the muck in order to excavate from top to bottom step by step. But steep slope terrains are short of the conditions to build parallel constructions of a number of sidewalks. After discussing, and based on the verification of two arch foundation excavation practice of Nanpan River Bridge, this paper summed up a set of practical and efficient excavation methods for deep foundation pit on steep slope terrains, which could provide reference value for similar projects.