丘间洼地区域高渗性软弱砂土层管道沟槽开挖施工OA

This paper presents the pipe trench excavation construction for the Tieshangang Branch Water Convey-ance Pipeline,a component of the Guangxi Water Resources Allocation Project around Beibu Gulf,which encoun-tered challenging geological conditions of highly permeable weak sandy soil layers in inter-hill depression areas.Steel sheet pile was adopted for pipe trench excavation support.Through comparison and selection of construction schemes,the block stone extrusion method and mixed material replacement method were applied for foundation treatment of the weak strata in the pipe trench.The construction has been carried out achieving satisfactory results.