摘要
研究目的:郑西客运专线三门峡至灵宝段为湿陷性黄土深厚地区,桥梁桩基由于存在负摩阻力而发生过量沉降。而针对湿陷性黄土地区桩基沉降的计算方法至今未见报道,因此有必要通过相关研究寻求适合本线湿陷性黄土地区桥梁桩基沉降计算方法以便在设计阶段控制总沉降值。研究结论:(1)湿陷性黄土地区桥梁桩基沉降计算必须考虑负摩阻力的影响;(2)桩基采用总沉降不大于规定值控制设计是合理的;(3)郑西线三门峡至灵宝段湿陷性黄土地区桥梁采用修正的铁路桥规方法计算桩基总沉降是可以控制设计的,施工期间应按相关规范进行沉降观测,并根据观测结果采用曲线回归法进行沉降评估分析;(4)桩底以下土层压缩模量是影响沉降计算值的主要因素,勘探时务必准确测定桩底以下土层压缩模量。
Research purposes： As the Sanmenxia- Linbao section of Zhengzhou -Xi＇an Passenger Dedicated Line lies in the deep collapsible loess zone, the over - settlement of bridge pile foundation occurs due to the negative friction resistance. No computing method for pile foundation settlement in collapsible loess zone is reported up to now, so it is necessary to do the searches on the computing method for the settlement of the bridge foundation pile in collapsible loess zone to control the total settlement in design. Research conclusions： （1） In the settlement computation of bridge pile foundation in collapsible loess zone, the influence of negative friction resistance should be considered. （2） In design, it is reasonable that the total settlement of not more than the specified value is adopted for controlling the settlement of bridge pile foundation. （3） For the bridges in collapsible loess zone along the railway from Sanmenxia to Linbao, adopting the modified code of railway bridge to compute the total settlement of pile foundation can control the design. （4） The modulus of compressibility of soil beneath the pile bottom is the main influence factor on settlement computation, so it must be preciously measured during prospecting.
出处
《铁道工程学报》
EI
北大核心
2009年第6期76-80,共5页
Journal of Railway Engineering Society
关键词
郑西线
湿陷性黄土
桥梁
桩基
沉降量
Zhengzhou - Xi＇ an Passenger Dedicated Line
collapsible loess
bridge
pile foundation
settlement computation
