预应力管桩承载力不满足要求原因分析与处理方法

作者:郭金雪 刘金波 张松 李冰
单位:中国建筑科学研究院有限公司
摘要:实际工程中常出现桩基承载力不满足要求的情况,分析原因并提出合理的处理方法对工程安全至关重要。某工程采用预应力管桩基础,通过对Q-S静载曲线、高应变检测数据、桩端持力层、施工时间等进行分析,得出预应力管桩承载力不满足要求的主要原因为桩端持力层遇水软化,并针对施工进度给出不同处理方法和建议,如桩端及时封堵、改变地基基础形式、加固防水板提高刚度、增强主裙楼间的连接刚度等。
关键词:桩基础承载力桩端持力层管桩软化处理
作者简介:郭金雪,硕士,国家一级注册建造师,E-mail:371726840@qq.com。
基金: -页码-:96-99
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[2] 中国建筑科学研究院.建筑基桩检测技术规范:JGJ 106—2014[S].北京:中国建筑工业出版社,2014.
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[4] 中国建筑科学研究院.建筑地基处理技术规范:JGJ 79—2012[S].北京:中国建筑工业出版社,2012.
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Cause Analysis and Treatment Method of Insufficient Bearing Capacity of Prestressed Pipe Pile
GUO Jinxue LIU Jinbo ZHANG Song LI Bing
(China Academy of Building Research)
Abstract: In practice, the bearing capacity of pile foundation ofter doesn't meet the requirements. It is very important to analyze the reasons and put forward reasonable treatment methods. Based on a project using prestressed pipe pile foundation, through the analysis of Q-S static load curve, high strain test data, pile end bearing layer and construction time, the main reason for the failure of bearing capacity of prestressed pipe pile is that the bearing layer at the end of pile is softened when water is encountered. Different treatment methods and suggestions are given for construction progress, such as timely plugging at pile end, changing the foundation form, strengthening waterproof board to increase rigidity, strengthening the connection rigidity between main podium buildings, etc.
Keywords: piles; bearing capacity; bearing layer of pile; pipe pile; softening; treatment
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