摘要
以北京某盾构法施工的区间隧道下穿附近既有地铁车站工程为背景,在确定了合理的应力释放率并充分考虑了分步开挖及注浆加固区影响的基础上,采用三维有限差分计算软件FLAC3D进行了数值模拟.模型采用地层-结构模型,土体采用摩尔-库仑弹塑性模型.此外,隧道和车站结构采用结构单元模拟,既有车站变形缝采用连接单元模拟.预测盾构隧道施工后既有地铁车站的变形,为邻近既有车站的安全评估工作提供了依据.
Based on the shield tunnel of a newly constructed line that crosses underneath the existing subway station in Beijing, concerning on the stress release method, step excavation and the prereinforced construction of the newly constructed line, the displacement influence is analyzed by a three - dimensional finite - difference program FLAC^3D. By means of FLAC^3D simulation a layer- structure model is established, and the Mohr- Coulomb criterion is used to describe the soil. Besides, the tunnel structure and the existing subway station simulate by the structural elements, and the hnk elements are used to simulate the settlement slot of the existing subway station. The deformation of the existing subway station is predicted, and the achieved results can provide references to the safety evaluation of the adjacent subway station.
出处
《佳木斯大学学报（自然科学版）》
CAS
2009年第2期206-209,213,共5页
Journal of Jiamusi University：Natural Science Edition
基金
北京市自然科学基金(8062007)
北京市教育委员会科技发展基金重点项目(Kz200910005009)
北京市科技计划(Y0605010040821)
北京市优秀人才培养资助项目(2008F-13)的资助
手机媒体的发展与管理探析(QW200707)
关键词
盾构隧道
分步开挖
应力施放
FLAC3D
数值模拟
shield - driven tunnel
step excavation
stress release
FLAC^3D
numerical simulation
