软土地区高层建筑桩基加固技术的应用研究

Application and research on pile foundation strengthening technology of high-rise building in soft soil area

软土地区高层建筑通常采用桩筏基础、独立承台桩基等形式。由于地层浅部土质软弱、施工速度过快、工序安排不合理、施工质量缺陷等原因,通常会造成桩基出现偏位、断桩等问题。建筑在施工完成后出现不均匀沉降,同时伴随着墙体开裂、倾斜等质量问题,后续使用存在安全隐患。本文通过对某高层建筑的基础形式、不均匀沉降原因进行研究分析,采用锚杆静压桩进行桩基加固,并针对桩基加固设计施工中遇到的技术难题提出了综合治理方法,解决了高层建筑桩基加固过程中涉及到的大吨位锚杆桩施工、低净空狭小空间压桩、独立承台桩基础无补桩空间、高地下水位封桩易渗漏等技术难题,取得了良好的效果。

Pile raft foundation,independent cap pile foundation and other forms are generally adopted for high-rise buildings in soft soil regions.Owing to the low-quality soil in the shallow strata,excessively rapid construction,ill-structured work procedures,and construction defects,issues like pile foundation deflection and breakage frequently arise.Subsequently,uneven settlement emerges post-construction,accompanied by issues like wall cracks and tilting,which pose safety risks in the future use of the building.In this work,the foundation form of a high-rise building and the cause of uneven settlement are analyzed.We further employ static anchor piles to fortify the pile foundation and offer a comprehensive solution to address technical challenges in the design and execution of pile foundation reinforcement.The study successfully resolves technical challenges in the high-rise building pile foundation reinforcement process,encompassing aspects like constructing high-capacity anchor piles,managing pile foundations within confined spaces,dealing with independent cap pile foundations lacking fill pile space,and mitigating the risk of sealed pile leakage in high groundwater conditions.