摘要
新建高速铁路联络线引入邻近既有线时,联络线建设引发的附加荷载可能对既有路基产生扰动。本文依托鲁南高速铁路曲阜东站联络线接轨段路基工程,开展不同桩型群桩试桩试验,研究群桩成桩对邻近场地的挤土变形影响,同时对比不同桩型成桩工艺的优缺点,进而为联络线地基加固方案提供设计依据。并在此基础上,结合接轨段路基变形监测数据,研究联络线地基加固及路基填筑对既有路基的扰动影响。研究结果表明:联络线地基加固选用灌注桩要优于预应力管桩和微型注浆钢管桩。鲁南高速铁路曲阜东站接轨段联络线采用灌注桩+钢筋混凝土承台板结构进行地基加固对既有京沪高速铁路路基扰动的影响微弱。采用轻质混凝土进行路基填筑,既有路基最大沉降变形为4.7 mm,满足规范要求。
When a new high-speed railway connecting line is introduced into the adjacent existing line,the additional load resulting from the construction of the connecting line may have adverse disturbance effects on the existing earthworks.This paper takes the earthworks for the junction section of connecting line in Qufu East Station of Rizhao-Lankao High-Speed Railway as a case,conducts the test of pile groups with different pile types to investigate the influence of pile groups on soil compaction deformation in adjacent sites,and compare the advantages and disadvantages of different pile types,thus providing design basis for earthworks reinforcement of connecting line.Combined with the monitoring data of earthworks deformation in the junction section,the disturbance of the foundation reinforcement and earthworks filling for the connecting line on the existing earthworks is studied.The results show that cast-in-place pile is better than prestressed pipe pile and miniature grouting steel tube pile in foundation reinforcement of connecting line.The foundation reinforcement of connecting line in Qufu East Station of Rizhao-Lankao High-Speed Railway with cast-in-place pile and reinforced concrete bearing platform slab structure has a minor disturbance on the existing earthworks of Beijing-Shanghai High-Speed Railway.Light concrete is used for earthworks filling,and the maximum settlement of the existing earthworks is 4.7mm,which meets the specification requirements.
作者
张红
秦文达
张海凤
孙召伍
曹乾桂
ZHANG Hong;QIN Wenda;ZHANG Haifeng;SUN Zhaowu;CAO Qiangui(Railway NO.10 Engineering Group Co.,Ltd.,Ji'nan 250001,China;Lunan High Speed Railway Co.,Ltd.,Ji'nan 250102,China)
出处
《高速铁路技术》
2021年第1期35-40,共6页
High Speed Railway Technology
关键词
联络线
既有路基
地基加固
路基填筑
沉降变形
connecting line
existing earthworks
foundation reinforcement
earthworks filling
settlement
