考虑桩-土共同作用的减沉桩设计方法适用性分析  

Applicability Analysis of Design Method for Settlement Reducing Pile Considering Pile-Soil Interaction

作　　者：杨军 杨敏[2] 陈海兵 Yang Jun;Yang Min;Chen Haibing(Guangzhou Municipal Engineering Testing Co.,Ltd.,Guangzhou 510520,Guangdong,China;College of Civil Engineering,Tongji University,Shanghai 210092,China;Institute of Foundation and Structure Technologies,Zhejiang Sci-Tech University,Hangzhou 310018,Zhejiang,China)

机构地区：[1]广州市市政工程试验检测有限公司,广东广州510520 [2]同济大学土木工程学院,上海210092 [3]浙江理工大学建筑工程学院,浙江杭州310018

出　　处：《岩土工程技术》2024年第6期680-691,共12页Geotechnical Engineering Technique

基　　金：国家自然科学基金项目(41372274);广东省住房和城乡建设科技计划项目(2022-K26-503115);广州市建筑集团有限公司科技计划项目([2021]-KJ052)。

摘　　要：针对复杂地层中减沉桩基础适用性的问题,基于大量实际工程探讨场地地基与建筑类型、最大沉降控制标准与桩土刚度分布等因素对减沉桩基设计结果的影响,提出以节约用桩量为优化目标的减沉桩基础应用准则和设计方法,并通过工程案例验证了方法的合理性。结果表明:减沉桩基础对多种场地和建筑物类型具有较好的适应性,基础重要性等级、天然地基承载力和桩土刚度分布是决定其应用的关键因素;从节约用桩量和保证基础整体安全性出发,建议软土和硬土地区建筑物所在场地的天然地基承载力满足率不低于0.5和0.65;从保证筏板承载力贡献率考虑,Gibson地基和分层地基的无量纲影响系数建议不低于2.3和1.5;满足上述各项要求可作为判定减沉桩基础适用的基本前提。Regarding the applicability of settlement-reducing piles in complex stratum conditions,the influence of factors such as the site condition and building type,maximum settlement control standard,and pile and soil stiffness distribution on the design of settlement-reducing piles based on a large number of practical engineering projects were discussed.The application criteria and design methods of settlement reducing pile as the optimization objective were proposed,and the rationality was verified by engineering cases.The results show that the settlement-reducing pile has good adaptability to various sites and building types.The important grade of the foundation,the bearing capacity of the foundation,and the stiffness distribution of the pile and soil are the key factors to determine its application.To save the amount of piles and ensure the overall safety of the foundation,it was recommended that the bearing capacity of the foundation in soft and hard soils should not be less than 0.5 and 0.65,respectively.Considering the contribution of raft-bearing capacity,the dimensionless influence coefficient of Gibson soil and layered soil was recommended not to be less than 2.3 and 1.5,respectively.Meeting the above requirements can be used as the premise to determine the applicability of the settlement-reducing pile.

关 键 词：桩–土共同作用 减沉桩设计 适用性 无量纲影响系数 天然地基承载力满足率 

分 类 号：TU473[建筑科学—结构工程]