摘要
基于武汉某道路工程项目,利用PLAXIS 2D建立了有限元模型,分析了不同隔离桩长度情况下,隔离桩对邻近既有隧道的变形控制作用。结果表明:邻近既有隧道的基坑开挖,若不采取相应加固措施,隧道及地下连续墙均会出现很大变形,威胁结构安全;隔离桩可对隧道起到良好变形控制作用,相较于无隔离桩情况,在L/H=1.5的情况下,水平和竖向变形分别降低66.9%和72.5%;通过参数分析,考虑安全性及经济性,隔离桩桩长建议取值范围为(1.4~1.8)H。
Based on a road project at Wuhan, a series of two-dimensional finite element model is established by finite element soft PLAXIS 2 D, and the deformation control of isolation piles with different pile lengths on adjacent existing tunnel is analyzed. The results show that if the reinforcement measures are not taken, excavation adjacent to existing tunnel can result in large deformation on existing tunnel and diaphragm wall, threatening structural safety. The isolation piles can play a good role in controlling the deformation of the tunnel. Compared with the case without isolation pile, the horizontal deformation and vertical deformation are reduced by 66.9% and 72.5% in the case of L/H=1.5, respectively. Through parameter analysis, considering safety and economy, the recommended value range of isolation pile is(1.4~1.8)H.
作者
李忠超
宋旭
刘源
肖铭钊
LI Zhongchao;SONG Xu;LIU Yuan;XIAO Mingzhao(Wuhan Municipal Construction Group Co.,Ltd.,Wuhan,Hubei430023,China;College of Civil Engineering,Hunan University,Changsha,Hunan410082,China)
出处
《施工技术（中英文）》
CAS
2021年第17期126-129,共4页
Construction Technology
基金
湖南省自然科学基金-优秀青年基金(2019JJ30006)。
关键词
基坑
隔离桩
邻近隧道
有限元分析
变形
foundation excavation
isolation piles
adjacent tunnel
finite element analysis
deformation
