中国铁道科学2018，Vol.39Issue(3)：15-23,9.DOI:10.3969/j.issn.1001-4632.2018.03.03
一种斜坡桥梁桩基础自由段桩长确定方法
Calculation Method for Free Segment Length of Bridge Pile Foundation on Slope
摘要
Abstract
Taking the method for determining the free segment length of bridge pile foundation on slope as the research target,the rock and soil mass with deformation trend in the free segment length of front pile is regarded as the three-dimensional wedge-shaped force body.Considering the dead weight of the force body in front of pile,the pulling force on both sides,the ultimate sliding resistance,frictional resistance at the bottom of the force body and the contact compressive stress between pile and soil,the formula for calculating its resultant sliding force is deduced.Based on the critical stability of the force body,the free segment length of bridge pile foundation on slope is determined,and the calculation program for the free segment length of bridge pile foundation on slope is developed by C #.The sensitivity analysis of the influencing factors on the free segment length of pile foundation on slope is carried out by using this program.Results show that the slope angle,the pile-soil contact compressive stress and the internal friction angle are relatively sensitive to the free segment length of pile,while the volume-weight of the rock and soil mass surrounding the pile is less sensitive to the free segment length of pile.The proposed method is used to calculate the design values of some free segment lengths of the steep slope bridge foundation on Chang-Kun passenger dedicated line.Results show that when the slope is gentle and the stratum is hard,the influence of the free segment length of pile can be neglected in the calculation of the internal force on bridge foundation.When the slope is steep or the strength of slope rock and soil is low,the calculated value of the free segment length of pile is relatively large.The influence of the free segment length of pile on the calculation of the internal force of pile foundation should be considered in the design of bridge pile foundation on steep slope.关键词
斜坡/桥梁桩基础/楔形受力体/临界稳定状态/自由段桩长Key words
Slope/Pile foundation of bridge/Wedge-shaped force body/Critical stable state/Free segment length of pile分类
建筑与水利引用本文复制引用
董捷,杨越,徐永明,宋绪国..一种斜坡桥梁桩基础自由段桩长确定方法[J].中国铁道科学,2018,39(3):15-23,9.基金项目
国家科技支撑计划项目(2013BAG20B00) （2013BAG20B00）
河北省自然科学基金资助项目(E2017404013) （E2017404013）
河北省教育厅重点科技开发项目(ZD2017224) （ZD2017224）
河北建筑工程学院校科研基金资助项目(B _201604) （B _201604）
