软弱地质大流速区域钢管桩夹桩设计与分析  

Design and analysis of steel pipe pile clamping in soft soil layer of high-flow river

作　　者：乐利光 杨磊 张广宇 Yue Liguang;Yang Lei;Zhang Guangyu(NO.5 Engineering Co.,Ltd.of CCCC First Harbor Engineering Co.,Ltd.,Qinhuangdao Hebei 066000,China)

机构地区：[1]中交一航局第五工程有限公司,河北秦皇岛066000

出　　处：《港口航道与近海工程》2024年第S01期1-4,共4页Port,Waterway and Offshore Engineering

摘　　要：几内亚力拓西芒杜港口项目钢管桩施工区域,局部浅层软土层较厚,当该位置处钢管桩打入到风化岩表层,未进行嵌岩处理时,桩基的抗水平力会较差,且本项目位于河流入海口,雨季涨落潮时,河流流速最大可达到3 m/s,在极端流速的加持下,钢管桩发生桩顶较大位移的概率非常大,如不采取有效夹桩措施,钢管桩打设将很难满足设计与规范要求。为了保证打桩精度,对钢管桩夹桩措施进行了设计和受力分析,可有效解决软弱地质条件下,大流速水流对钢管桩施工精度的影响,具有先进性和适用性,可为类似项目提供技术借鉴与参考。Steel pipe piles are used in the construction of a port terminal of Rio Tinto Simandou t in Guinea.Part of the site presents a thick layer of local shallow soft soil.When the steel pipe piles are driven into the surface layer of the weathered rock at this location,the horizontal resistance of the pile foundation will be poor when the pile tips are not embedded in rock socket.In addition,the project site is located at the mouth of the river,where the curreent flow velocity can reach 3 m/s during the flooding tide or ebbing tide in the rainy season,and the probability of large displacement of the steel pipe pile is very large in the case of the extreme flow velocity.If effective pile clamping measures are not taken,it will be difficult for the steel pipe pile to meet the design and specification requirements.In order to ensure the accuracy of the piling work,analyses are made on the stresses in the piles,having resulted in the proposal and application of a series of measures for the clamping of the steel pipe pile.The proposed measures can effectively solve the influence of large flow rate on the accuracy of pile driving work performed in weak soil,Being technically advanced and applicable,the techniques can provide technical reference for similar projects.

关 键 词：软土层 大流速 位移 夹桩 

分 类 号：U655.55[交通运输工程—港口、海岸及近海工程]