紧邻道路的双排桩支护的深基坑设计施工与监测
Design, Construction and Monitoring of Double-Row Contiguous Pile for Deep Foundation Pit Adjacent to Road

在复杂环境条件下，软土地区大面积基坑工程围护结构选型关系到基坑工程的经济与安全，双排桩围护结构是一种韧性好、开挖便利的支护形式，很受业界欢迎。但是双排桩的受力机理比较复杂，以至于一些重要参数如何取值，现行基坑规程仍难明确，需待更多工程实践予以丰富。本文结合江苏南沿江城际铁路武进站综合交通枢纽基坑工程，对双排桩的工程应用进行了现场实测和数值模拟。结果表明，悬臂双排桩围护在周边环境复杂的武进软土地区也是适用的，位移控制效果良好。鉴于某些设计中双排桩变形高估导致过于保守的情况，有限元数值模拟却得到了与实测值较为吻合的结果，证明有限元数值模拟是工程设计中需要特别重视的辅助手段。
Under complex environmental conditions, the selection of contiguous structure for large-scale foundation pit engineering in soft soil areas is related to the economy and safety of foundation pit engineering, and cantilever double-row contiguous pile (CDRCP) is a support form with good toughness and convenient excavation, which is very popular in the industry. However, the mechanical mechanism of double-row piles is complicated, so the value of some important parameters is still difficult to determine the current rules of the foundation pit, which needs to be enriched by more engineering practice. In this paper, combined with the foundation pit engineering of Wujin Transportation Hub of Express Railway Station in Jiangsu Province, the field measurement and numerical simulation of the double-row pile are carried out. The result shows that the double-row pile is also suitable for the soft soil area of Wujin where the surrounding environment is complex, and the displacement control effect is good. In view of the overestimation of the deformation of double-row piles in some designs, the results obtained by finite element numerical method (FEM) are in good agreement with the measured values, which proves that finite element numerical method (FEM) is an auxiliary means that needs special attention in engineering design.