承压水对抗拔桩施工的影响及对策  

Influence of confined water on uplift pile construction and countermeasures

作　　者：韩丽 夏长华 李德志 丁保华 江宁 HAN Li;XIA Changhua;LI Dezhi;DING Baohua;JIANG Ning(Infrastructure Construction Department of Peking University Health Science Center,Beijing 100191,China;State Key Laboratory of Building Safety and Built Environment,Beijing 100013,China;China Academy of Building Research Foundation Institute,Beijing 100013,China;Beijing Engineering Technology Research Center of Foundation and City Underground Space Development and Utilization,Beijing 100013,China;China Building Technique Group Co.,Ltd.,Beijing 100013,China)

机构地区：[1]北京大学医学部基建工程处,北京100191 [2]建筑安全与环境国家重点实验室,北京100013 [3]中国建筑科学研究院有限公司地基基础研究所,北京100013 [4]北京市地基基础与地下空间开发利用工程技术研究中心,北京100013 [5]中国建筑技术集团有限公司,北京100013

出　　处：《建筑结构》2023年第9期137-140,共4页Building Structure

摘　　要：针对某具体工程实例,通过磁测检测、取芯检测、开挖检测、静载试验试桩检测,分析了抗拔桩抗拔承载力不足的原因及承压水对抗拔桩带来的危害,指出承压水及抗拔桩施工工艺引起的桩侧摩阻力的降低是导致抗拔桩抗拔承载力不足的原因。提出了具有承压水水文地质条件下抗拔桩施工工艺与质量控制措施即试桩、降止水、提高泥浆质量、采用后压浆工艺及增加上覆土,以期对类似工程地质及水文地质条件下抗拔桩的施工提供参考。In view of a specific engineering example,the reasons for the insufficient uplift bearing capacity of uplift piles and the harm caused by confined water to uplift piles were analyzed through magnetic testing,core testing,excavation testing,and static load test pile testing.It is pointed out that the reduction of pile side friction resistance caused by confined water and the construction technology of uplift piles is the reason for the insufficient uplift bearing capacity of uplift piles.The construction technology and quality control measures of uplift piles under hydrogeological conditions of confined water were put forward,namely test pile,dewatering and water sealing,improving mud quality,adopting post grouting technology and increasing overlying soil in order to provide reference for the construction of uplift piles under similar engineering geology and hydrogeological conditions.

关 键 词：承压水 抗拔桩 后压浆 泥浆 上覆土 

分 类 号：TU318.1[建筑科学—结构工程]