摘要
针对地铁隧道开挖诱发地表下沉,致使已有桥基变位的问题,采取经验法的叠加原理预测双线隧道开挖对地表沉降曲线的影响。以西安地铁3#线某区间为工程背景,采用三维有限差分数值(FLAC3D)软件模拟浅埋暗挖不同工况对地表和邻近桩基沉降的影响。理论分析及数值模拟结果均表明:双线隧道引发的地表沉降呈"U"型曲线分布,且沉降槽宽度影响范围和地表沉降均较单线隧道大。环形开挖预留核心土法可作为该区间隧道的主要施工工法。现场监测分析表明:该施工工法能有效地降低地表沉降和桩基变形,对黄土地区该类隧道工程具有一定的指导意义和借鉴价值。
To solve the problem that sedimentation of the ground surface and the deformation of the existing bridge pier caused by metro tunnel excavation,the effect of double line tunnel on surface sedimentation curve was studied by using the superposition principle of experience method. In order to study the ground surface sedimentation and the adjacent pile foundation deformation induced by different excavation methods,the three dimensional finite difference numerical simulation( FLAC3D) was adopted based on the engineering of Xi'an metro line 3 tunnel. Theoretical analysis and numerical simulation results show that the surface sedimentation of the double tunnel excavation is 'U'type distribution and the settlement trough width is wider than that of the single tunnel excavation. The ring cut method is preferentially selected as the construction technique of the tunnel. Moreover the field monitoring analysis show that the construction technique can effectively reduce the settlement of the ground surface and the deformation of the pile foundation,which has a certain guiding significance and a reference value for the loess area.
出处
《河南科技大学学报（自然科学版）》
CAS
北大核心
2017年第3期60-63,68,共5页
Journal of Henan University of Science And Technology:Natural Science
基金
国家自然科学基金项目(51405385)
陕西省教育厅专项科研计划基金项目(15JK1562)
西安石油大学博士科研启动基金项目(250205002)
关键词
叠加原理
地表沉降
FLAC3D软件
邻近桩基沉降
环形开挖预留核心土法
现场监测
superposition principle
surface sedimentation
FLAC3D software
sedimentation of adjacent pile foundation
ring cut method
field monitoring
