对规范中铁路桥梁桩基计算方法的补充  

Supplement to Calculation Method for Bridge Pile Foundation in Railway Code

作　　者：高欣梅[1] 

机构地区：[1]铁道第三勘察设计院集团有限公司,天津300142

出　　处：《高速铁路技术》2013年第3期58-61,共4页High Speed Railway Technology

摘　　要：在铁路桥梁桩基计算工程中,经常会遇到不等长桩、不等径桩和不对称桩的计算,以及山区陡坡上单桩水平承载力的验算,岩溶、液化土、湿陷性黄土等不良地质的桩基计算。文章根据《铁路桥梁地基和基础设计规范》m值法的原理推导引申出不等长桩、不等径桩和不对称桩的计算方法,并参考《建筑桩基技术规范》的计算方法验算山区陡坡上单桩水平承载力,结合多年来铁路多条线路的设计经验,总结了陡坡处自由桩长计算、湿陷性黄土摩阻力取值、地震液化土层力学指标折减、岩溶区桩端顶板安全厚度计算这些不良地质情况下桩基计算参数的取值。从而弥补了《铁路桥梁地基和基础设计规范》中铁路桥梁桩基计算方法的不足,在实际设计过程中得到很好地应用。In the calculation of pile foundation for railway bridges,calculations are always required for unequal-length pile,unequal-diameter pile and asymmetric pile,and for the horizontal bearing capacity of single pile on abrupt slope in mountainous area and the calculation of pile foundation in unfavorable geology such as karst caves,liquefied soil and collapsible loess.In the paper,according to principle of m value method in“Code for Design on Subsoil and Foundation of Railway Bridge”,a calculation method is derived for unequal-length pile,unequal-diameter pile and asymmetric pile;A check is made on horizontal bearing capacity of single pile on abrupt slope in mountainous area referring to the calcu-lation method in “Technical code for building pile foundations”;Combined with the design experiences of various rail-way lines for many years,a summarization is made on parameter values for calculation of pile foundation under such un-favorable geology conditions as abrupt slope,collapsible loess,earthquake liquefied soil and karst area,which will make up the shortage of calculation method for pile foundation of railway bridge in“Code for Design on Subsiol and Foundation of Railway Bridge”and are successfully applied in the design.

关 键 词：桩基计算 铁路桥梁 不良地质 单桩水平承载力 不对称桩 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]