摘要
随着城市地下空间的发展,各种新建管道基坑与已建地下项目的空间相互影响成为常态,以某新建排水管线沟槽基坑上穿已建城市地道为例进行分析。随着地道上部沟槽土体开挖,道埋深减少,土压解除,垂直荷载减少,地道产生附加变形及附加内力会对地道结构产生不利影响,严重时可导致地道管片破裂、接缝张开。针对抗浮、开挖变形等方面提出保护措施,并通过有限元软件分析土体及结构变形,确保影响控制在允许范围内,为类似的工程设计、分析及施工提供借鉴。
With the development of urban underground space, the spatial interaction between various new pipeline foundation pits and the built underground projects has become the normal. A new drainage pipeline trench foundation pit passing through a built urban tunnel is analyzed. With the excavation of the trench soil on the tunnel, the buried depth of the tunnel is reduced, the earth pressure is relieved, the vertical load is reduced, and the additional deformation and internal force of the tunnel produce the adverse effects on the tunnel structure, and will lead to the crack of tunnel segments and the opening of joints if seriously. The protection measures are proposed for the floating resistance and excavation deformation, which can be referred for the design, analysis and construction of the similar projects.
出处
《城市道桥与防洪》
2022年第10期121-123,M0013,共4页
Urban Roads Bridges & Flood Control
关键词
沟槽开挖
PLAXIS
抗浮
地道变形
MJS注浆加固
trench excavation
PLAXIS
anti-floating
tunnel deformation
MJS grouting reinforcement
