桩基施工对防汛墙的影响分析与控制限值研究

Analysis on Impact of Pile Foundation Construction on Flood Control Walls and Research on Control Limits

摘要:

黄浦江防汛墙作为上海市防洪体系的组成部分，是保障城市安全与人民生命财产安全的重要屏障，具有长远的战略意义。近年来，在堤防管理及保护范围以外实施的施工项目日益增多，桩基施工对邻近防汛墙结构安全造成的潜在风险逐渐显现，为实现针对该类工程潜藏安全隐患的事前防控，选定有限元法作为主要分析工具，结合回归分析等统计方法，开展挤土桩基施工对防汛墙变形特性的影响规律研究。研究发现断面型式、施打桩基的间距变化对防汛墙的影响有限，施打桩基的桩长、桩径及桩墙距离是影响防汛墙变形的主控因素，在此基础上根据黄浦江上、中、下游不同条件，提出了以桩长、桩径为查询条件，以不同防汛墙距离为查询结果的限值表。

Abstract:

The flood control wall of Huangpu River, as a component of flood control system in China, is an important barrier for safeguarding the urban safety and the lives and property of the people, and has the long-term strategic significance. In recent years, the number of construction projects carried out outside the management and protection scope of embankments is increasing day by day. The potential risks posed by pile foundation construction to the structural safety of the adjacent flood control wall are gradually emerging. To achieve pre-emptive prevention and control of potential safety hazards in such projects, the finite element method is selected as the primary analytical tool to study the impact of displacement pile foundation construction on the deformation characteristics of flood control wall by combining the statistical methods such as regression analysis. It is found that the cross-sectional type and spacing variations of driven piles have limited effects on flood control walls, while the pile length, pile diameter and pile wall distance are the primary factors influencing the deformation of flood control walls. Based on this and according to the different conditions along the upper, middle and lower reaches of the Huangpu River, a limit table is proposed with pile length and pile diameter as the query conditions, and with different distances of flood control walls as the query results.