“桩墙合一”支护结构协同作用及影响因素分析

Effect and Influencing Factors of “Soldier Pile-Slurry Wall Integration” Supporting Structure

以武汉市某基坑工程为研究背景,分析了桩墙合一支护结构的协同作用机理,讨论了传力板带截面尺寸的变化对桩墙合一支护结构的影响。研究结果表明:①与传统支护桩支护结构相比,“桩墙合一”支护结构中支护桩最大水平位移降低51.89%,地下外墙最大水平位移也显著减小。②在永久使用阶段中,相对于传统支护桩支护结构,“桩墙合一”支护结构中地下室外墙弯矩降低59.88%。③传力板带截面尺寸的变化对“桩墙合一”支护结构影响较小,在满足有效传力及施工间距的前提下,可适当减少传力板带的宽度或厚度,节省建筑材料及工程成本。

This paper presents a case history of a deep excavation project in Wuhan.The cooperative mechanism of the soldier pile-slurry wall integrated supporting structure is evaluated and the influence of the change of the section size of the force transfer plate on the soldier pile-slurry wall integrated supporting structure is discussed.The results show that the soldier pile-slurry wall combined supporting structure has significant synergistic effect,which can effectively reduce the displacement and the internal force acting on the underground structures.The change of the section size of the force transfer plate has little impact on the underground structure.On the premise of meeting the effective force transfer and the required construction spacing,the section size of the force transfer plate can be appropriately reduced to save the construction materials and costs.