盐田港区复杂地质条件下桩基础设计  

Pile foundation design under complex geological conditions in Yantian port area

作　　者：杨留娟 张滔滔 YANG Liujuan;ZHANG Taotao(CCCC Third Harbor Consultants Co.,Ltd.,Shanghai 200032,China)

机构地区：[1]中交第三航务工程勘察设计院有限公司,上海200032

出　　处：《水运工程》2025年第3期96-100,132,共6页Port & Waterway Engineering

摘　　要：工程场地复杂,土层分布不均。当采用预制桩时,穿越上部碎石土层和基岩风化层困难较大;当采用灌注桩时,场地浅部分布松散碎石土层和砂土层,砂土层渗透系数较大,与地表海水水力联系较强,地下水的流动可能会受到海水涨潮和落潮的影响,对钻孔孔壁产生冲刷,增加孔壁坍塌的可能。针对场地复杂问题,现场进行了前期灌注桩和PHC桩试桩,灌注桩试桩泥浆流失严重,充盈系数过大,采用10 m钢护筒、泥浆加强配置黏度系数等措施仍出现异常现象,PHC桩试桩采用引孔辅助沉桩法进行抗压静载试验,达到极限承载力要求。从安全性、经济性、施工可行性等多角度进行桩型比选设计,确定采用PHC桩,可为工程设计提供宝贵的设计经验。The site of this project is complex and the distribution of soil layers is uneven.When choosing prefabricated piles,it is difficult to cross the upper gravel soil layer and weathered bedrock layer.When choosing cast-in-place piles,loose gravel and sand layers are distributed in the shallow part of the site.The permeability coefficient of the sand layer is high,and it has a strong hydraulic connection with the surface seawater.The flow of groundwater may be affected by the rising and falling tides of seawater,which can cause erosion of the borehole wall and increase the possibility of borehole wall collapse.In response to the complex site issues mentioned above,preliminary cast-in-place pile and PHC pile tests are conducted on site.The mud loss of the cast-in-place pile test is severe,and the filling coefficient is too high.Measures such as using a 10 m steel casing and mud reinforcement to configure the viscosity coefficient still showed abnormal phenomena.The PHC pile test is conducted using the method of using a hole to assist in pile sinking for compressive static load testing,achieving the ultimate bearing capacity requirements.This article compares and designs pile types from multiple perspectives such as safety,economy,and construction feasibility,and determines the use of PHC piles,which can provide valuable design experience for engineering design.

关 键 词：地基基础设计 PHC桩 灌注桩 

分 类 号：U655.544.1[交通运输工程—港口、海岸及近海工程]