管桩基础遇大面积孤石时的补桩措施探讨  

Discussion on Pile Filling Measures when Pipe Pile Foundation Encounters a Large Area of Solitary Stone

作　　者：何沙沙 沈敦桂 HE Shasha;SHEN Dungui(China Energy Engineering Group Guangdong Electric Power Design Institute Co.,Ltd.Guangzhou 510663,China;Guangdong Construction Engineering Quality&Safety Testing Head Station Co.,Ltd.Guangzhou 510500,China)

机构地区：[1]中国能源建设集团广东省电力设计研究院有限公司,广州510663 [2]广东省建设工程质量安全检测总站有限公司,广州510500

出　　处：《广东土木与建筑》2024年第11期34-36,共3页Guangdong Architecture Civil Engineering

摘　　要：在花岗岩孤石发育的场地内进行管桩基础施工时,经常会遇到断桩和沉桩困难的情况。文章结合工程实例,从设计角度探讨了孤石地基的补桩方案及设计验算,提出一种以孤石为桩端持力层的灌注桩补桩方案。该方案要求灌注桩桩端嵌入孤石1倍桩径的距离,按摩擦端承桩计算单桩竖向承载力特征值,并按软弱下卧层复核孤石下卧土的承载力。该方案已在工程实例中得到应用,工程桩基检测中的静载试验表明桩的承载力及沉降均满足要求,可供同类工程参考。When constructing pipe pile foundations in areas with developed granite boulders,it is common to encounter situations of pile breakage and difficulty in sinking piles.This article combined engineering examples to explore the pile filling scheme and design verification of isolated stone foundation from a design perspective.A pile filling scheme using isolated stones as the bearing layer at the pile end was proposed,which required the pile end of the cast-in-place pile to be embedded at a distance of one time the pile diameter of the isolated stone.The characteristic value of the vertical bearing capacity of a single pile was calculated by massaging and rubbing the end bearing pile,and the bearing capacity of the soil under the isolated stone was rechecked according to the weak underlying layer.This scheme had been applied in engineering examples,and static load tests in pile foundation testing had shown that the bearing capacity and settlement of the piles could meet the requirements,which could be used as a reference for similar projects.

关 键 词：孤石 桩基础 补桩 嵌岩桩 

分 类 号：TU473.12[建筑科学—结构工程]