碎石桩复合地基抗剪强度特性研究  

Study on Shear Strength Characteristics of Gravel Pile Composite Foundation

作　　者：杨杰[1,2] 赵磊 李凯 Yang Jie;Zhao Lei;Li Kai(Nanjing Hydraulic Research Institute;Nanjing R&D Tech Group Co.,Ltd.)

机构地区：[1]南京水利科学研究院,南京市210024 [2]南京瑞迪建设科技有限公司,南京市210029

出　　处：《勘察科学技术》2024年第3期23-27,共5页Site Investigation Science and Technology

摘　　要：振冲碎石法作为一种环保的地基加固技术广泛应用于水下软土地基,该方法在提高软土地基承载力的同时可以提高土体的抗剪强度。该文主要分析了振冲碎石桩法加固软土地基施工质量的控制因素,建立了桩体动探击数-密度-抗剪强度指标之间的关系,对桩体抗剪强度特性进行研究。研究表明:密实电流、施工顺序是影响碎石桩成桩密实度和均匀性的关键因素;通过试验数据分析建立了桩体重型动探击数与抗剪强度之间的关系,进而通过现场试验得到其抗剪强度,便于对岸坡整体稳定性的定量分析,为类似工程的设计施工和研究提供借鉴。The vibro-compacted gravel pile method,as an eco-friendly foundation reinforcement technology,is widely used in underwater soft soil foundations.This method not only improves the bearing capacity of soft soil foundations but also enhances the shear strength of the soil.This paper mainly analyzes the control factors of the construction quality of using the vibro gravel pile method to reinforce soft soil foundation,establishes the relationship between the dynamic probing number-density-shear strength indicators of the pile body,and studies the shear strength characteristics of the pile body.The research shows that the compaction current and construction sequence are key factors affecting the compactness and uniformity of gravel pile construction.The relationship between the number of dynamic probing blows and the shear strength of pile body type is established through experimental data analysis,and the shear strength is obtained through on-site tests,which facilitates the quantitative analysis of the overall stability of the bank slope and provides reference for the design,construction,and research of similar projects.

关 键 词：振冲碎石桩 复合地基 抗剪强度 稳定性 

分 类 号：U655.54[交通运输工程—港口、海岸及近海工程]