非等长双排桩在武汉地区基坑工程中的应用

Application of unequal length double-row piles in a foundation pit project in Wuhan

摘要:

以武汉仁恒公园世纪深基坑支护项目为研究背景，通过设置前长后短非等长双排桩进行基坑支护，并利用天汉设计软件对该项目的某一个支护段进行设计计算分析。结果表明：该支护段的前后排桩的最大位移为37.9 mm，在地面以下1.0 m处（即桩顶），被动区弹性抗力安全系数为3.90。而本项目基坑预警控制指标为支护结构水平位移≤40 mm，能够满足设计监测要求，为以后非等长双排桩在基坑中的应用提供参考借鉴。

关键词:基坑支护;非等长双排桩;桩顶位移;武汉地区

Abstract:

Taking the deep foundation pit support project of Wuhan Renheng Park Century as the research background, design calculation and analysis is conducted with Tianhan Design Software on some support section of the project, where the foundation pit was supported by unequal double-row piles, that is, the front row piles were longer and the rear row piles were shorter. The results of calculation and analysis shows that the maximum displacement of the front row and rear row piles of the support section is 37.9mm, that occurs at 1.0m below the ground (at the top of the pile), and the elastic resistance safety factor in the passive zone is 3.90. The early warning control index for the foundation pit of this project is the horizontal displacement of the supporting structure not greater than 40mm, which can meet the design monitoring requirements and provide reference for the future application of unequal length double-row piles in the foundation pit.

Key words:foundation pit support; unequal length double-row piles; pile top displacement; Wuhan area