摘要
以鲁南高速铁路曲阜东站联络线接轨工程为研究背景,利用ABAQUS软件建立有限元模型,分析并线高速铁路间的隔离桩桩长、桩径、桩间距、排数对既有路基附加沉降隔离效果的影响,提出并线高速铁路隔离桩关键设计参数确定方法。研究结果表明:隔离桩越长,对既有路基附加沉降控制效果越明显,且隔离桩桩长应大于新建铁路复合地基处理深度;隔离桩桩径与既有路基附加沉降控制效果呈正相关,但当桩径超过0.4 m时,桩径增加对隔离效果的提升效应相对减弱;隔离桩桩间距是影响隔离效果的关键因素,宜取3倍桩径;双排桩对既有路基附加沉降的控制效果与桩间距相关,桩间距相对较大(约为6倍桩径)时双排桩相较于单排桩能够显著提高隔离效果,但当桩间距较小(约为3倍桩径)时,双排桩隔离效果与单排桩基本相当。
Taking Rizhao-Lankao high speed railway Qufu east station connecting line project as the research background,the finite element model was established by using ABAQUS software.The influence of the length,diameter,spacing and row number of isolation piles on the additional settlement isolation effect of existing subgrade was analyzed.The determination method of key design parameters of isolation pile for high speed railway of Co-line line was proposed.The research results show that the longer the isolation pile is,the more obvious the additional settlement control effect of the existing subgrade is,and the length of the isolation pile should be greater than the treatment depth of the new railway composite foundation.The pile diameter of the isolation pile is positively correlated with the additional settlement control effect of the existing subgrade.When the pile diameter exceeds 0.4 m,the increase in the pile diameter will relatively weaken the improvement of the isolation effect.The distance between isolation piles is the key factor affecting the isolation effect,which should be 3 times of pile diameter.The control effect of double-row piles on the additional settlement of the existing subgrade is related to the pile spacing.When the pile spacing is relatively large(about 6 times the pile diameter),the double-row piles can significantly improve the isolation effect compared with the single-row piles.However,when it is smaller(about 3 times the pile diameter),the isolation effect of doublerow piles is basically equivalent to that of single-row piles.
作者
李帆
周宝岐
郭帅杰
黄海新
LI Fan;ZHOU Baoqi;GUO Shuaijie;HUANG Haixin(School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China;China Railway Design Corporation,Tianjin 300251,China)
出处
《铁道建筑》
北大核心
2020年第10期83-88,共6页
Railway Engineering
基金
中国铁路设计集团科技开发计划(721743)
天津市交通运输科技发展项目(2018-35)
河北省交通运输厅科技项目(TH-201916)。
关键词
铁路路基
隔离效果
数值计算
隔离桩
附加沉降
并线高速铁路
railway subgrade
isolation effect
numerical calculation
isolation pile
additional settlement
co-line high speed railway
