堆填作用下滨海软土地层既有建筑桩基病害治理实践  

Practice of reinforcing pile foundation of existing buildings in coastal soft soil layers under landfill action

作　　者：钟贵荣 ZHONG Guirong(Fujian Academy of Building Research Co.,Ltd.,Fuzhou 350108,Fujian,China;Fujian Key Laboratory of Green Building Technology,Fuzhou 350108,Fujian,China)

机构地区：[1]福建省建筑科学研究院有限责任公司,福建福州350108 [2]福建省绿色建筑技术重点实验室,福建福州350108

出　　处：《地基处理》2024年第6期611-617,共7页Journal of Ground Improvement

基　　金：福厦泉国家自主创新示范区协同创新平台项目(35022CQXT202202);福建省对外合作科技计划项目(2022I0014);福建省建设科技项目(2022-K-143)。

摘　　要：滨海软土地层开发前常需进行地表堆填处理,堆填土层内碎石含量高及地下水丰富等特性对工程建设产生不利影响,堆填土层产生的附加载荷作用会影响已建建筑的基础稳定。通过分析地下室结构的变形特性,并采用开挖方式检查既有建筑桩基的变形情况,研究堆填作用下滨海软土地层中既有建筑桩基产生病害的原因,并提出适合地下室结构特点及堆填土层特性的锚杆静压桩治理方案和关键技术。实践表明,通过设置临时钢支撑及在底板增加配重堆载,均可提高压桩阶段地下室结构的稳定性;采用跨承台压桩及降低外墙承台压桩速率等方式可以有效控制附加沉降;在地下室外墙开孔泄压及承台内布置降水井可有效降低地下水位。本工程的顺利实施可为类似项目的桩基病害分析、加固方案设计及实施提供参考。Before using coastal soft soil layers,surface filling treatment is often required.The loading effect of the filling and the characteristics of the filling soil layer will have an impact on engineering construction and foundation stability.This paper analyzes the deformation characteristics of underground structures and examines the deformation of foundation piles of existing buildings through excavation methods.This study investigates the causes of foundation pile defects for existing buildings in coastal soft soil layers under landfill action and proposes a technical remediation plan and key remediation technologies for foundation piles using anchor jacked piles,tailored to the structural features of basements and the characteristics of landfill soil layer.The practice of pile foundation treatment has shown that the stability of basement during piling can be improved by setting temporary steel supports and adding counterweight stacking loads to the bottom plate.The additional settlement caused by piling can be effectively controlled by using methods such as cross-cap piling and lengthening the piling process.Creating pressure-relief openings in the external basement walls and installing dewatering wells inside the caps can effectively lower the groundwater level.The successful remediation of foundation pile defects provides a reference for defect analysis,reinforcement scheme design,and remediation implementation for similar projects.

关 键 词：滨海软土 堆填 桩基 病害治理 锚杆静压桩 

分 类 号：TU473[建筑科学—结构工程]