不同支护结构的桩身应力及其分析

In Situ Measured Data and Systematic Study of Pile Body Stress in Different Retaining Structures

钻孔灌注桩悬臂支护结构和单层支点混合支护结构是常用的深基坑支护结构型式 ,钻孔灌注桩连拱式组合拱结构是一种新型的支护结构型式。通过对南京某大厦深基坑开挖过程中 ,桩身应力的实测研究和对比分析 ,获得了在相同的工程水文地质、施工和降水条件下 ,3种不同支护结构的受力主筋在不同深度的应力大小及其分布形态 ,为设计计算和钻孔灌注桩连拱式组合拱结构的推广应用积累了宝贵资料。

Borehole cast-in-place concrete pile cantilever retaining structure and single-pivot mixed retaining structure are usually deep-foundation retaining structures. Borehole cast-in-place concrete pile multi-arch retaining structure is a new retaining structure. Based on the in situ measured data and discussion on pile body stress at certain deep-foundation pit excavation in Nanjing city,the magnitudes and distribution patterns of force acted on single retaining pile at different excavation depths in different retaining structures under same engineering geological and hydrogeological conditions,but in the same conditions of construction and cut down groundwater were obtained. Valuable information is provided in this paper for retaining structure design of pit excavation and extending use of borehole cast-in-place concrete pile multi-arch retaining structure.