摘要
高速铁路对桥梁纵横向刚度要求严格,而地基系数的比例系数m是影响桥梁刚度的重要参数。为获得设计工点m的合理取值,本文通过现场单桩水平静载试验测试单桩水平承载力、位移和弯矩分布情况,得到深厚软土地段桩顶位移和桩身应变随水平力的变化规律,根据理论公式计算出m值并用公式进行拟合,从而给出了桥梁设计中单桩m值的建议值,结果表明:(1)桩基水平位移随水平力增加呈非线性变化,m值随桩基地面处位移呈幂函数衰减;(2)设计工点单桩m值为10 263~11 554 kPa/m^(2),与规范取值(3 000~5 000 kPa/m^(2))相比偏大。本文研究可为类似工程提供参考。
High-speed railways have strict requirements on the longitudinal and transverse stiffness of bridges,and the proportionality coefficient m of the foundation coefficient is an important parameter affecting the stiffness of bridges.In order to obtain a reasonable value of m at the design site,the horizontal bearing capacity,displacement,and bending moment distribution of a single pile are tested in the paper with an on-site single-pile horizontal static test,and the change rules of pile top displacement and pile body strain with horizontal force in deep and thick soft soil sections are obtained.The m value is calculated according to the theoretical formula and fitted with the formula,thus the recommended value of m for a single pile in bridge design.The results show that:(1)The horizontal displacement of the pile foundation changes nonlinearly with the increase of horizontal force,and the value of m attenuates with the displacement at the pile foundation surface as a power function.(2)The m value of a single pile at the design work site is10 263~11 554 kPa/m^(2),which is larger than the specification value(3 000~5 000 kPa/m^(2)).This study can provide a reference for the design site and subsequent similar projects.
作者
李雷
钟昌卫
徐伟宸
唐冕
宋旭明
LI Lei;ZHONG Changwei;XU Weichen;TANG Mian;SONG Xuming(China Railway Shanghai Bureau Group Co.,Ltd.,Nanjing 210024,China;China Railway Fourth Survey and Design Institute Group Co.,Ltd.,Wuhan 430063,China;Central South University,Changsha 410075,China)
出处
《高速铁路技术》
2022年第6期57-62,共6页
High Speed Railway Technology
关键词
软土地区
地基系数的比例系数
水平静载
试验研究
soft soil area
proportionality coefficient of foundation coefficient
horizontal static load
experimental study
