大直径桩连续打桩过程中桩周土阻力衰减规律  

Attenuation Law of Soil Resistance Around Large Diameter Pile During Continuous Driving

作　　者：刘润[1] 孟祥然 练继建[1] 赵迎九 贾沼霖 王龙[3] LIU Run;MENG Xiangran;LIAN Jijian;ZHAO Yingjiu;JIA Zhaolin;WANG Long(School of Civil Engineering,Tianjin University,Tianjin 300350,China;Huadian Heavy Industries Co.,Ltd.,Tianjin 300010,China;Tianjin Port(Group)Co.,Ltd.,Tianjin 300461,China)

机构地区：[1]天津大学,天津300350 [2]华电重工股份有限公司,天津300010 [3]天津港(集团)有限公司,天津300461

出　　处：《中国海洋平台》2021年第3期1-6,12,共7页China offshore Platform

基　　金：国家自然科学基金委杰出青年基金(编号:51825904)。

摘　　要：详细阐述标准贯入法、美国石油协会(API)规范法和港口规范法等3种确定桩周静态土阻力的方法,并分别采用常系数法、线性法、非线性法、指数法和应力历史法模拟连续打桩过程中桩周土体强度衰减规律,结合实际工程进行打桩分析。结果表明,基于GRLWEAP程序中的标准贯入法确定桩周土体静阻力,并采用常系数折减法模拟连续打桩导致的桩周土体强度衰减,所得分析结果更接近工程实际的打桩记录。在连续打桩过程中,深度较浅的黏土层强度弱化显著,在预测溜桩等极端状况时应重点关注。Three static soil resistance analysis methods,i.e.standard penetration method,API code method and port code method,are introduced in detail.The constant coefficient method,linear method,non-linear method,index method and stress history method are used to simulate the law of the strength attenuation of the soil during the continuous driving process,and the driving analysis is carried out in combination with the actual project.The results show that when the static resistance of the soil around the pile is determined based on the standard penetration method in GRLWEAP program and the constant coefficient reduction method is used to simulate the strength attenuation of the soil around the pile caused by continuous driving,the analysis results are closer to the actual driving records of the project.In the process of continuous pile driving,the strength of the clay layer with shallow buried depth weakens significantly,which should be paid more attention to in the prediction of pile-running.

关 键 词：大直径桩 打桩 土体强度衰减 数值模拟 

分 类 号：TU43[建筑科学—岩土工程]