Interaction of Excavated Tunnels by Earth Pressure Balance Machines (EPBMs) and Subsurface Obstacles, Case Study: Tehran Metro Line 7

IF 1.1 Q3 MINING & MINERAL PROCESSING
D. Mohammadi, K. Shahriar, D. Parsapour
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引用次数: 0

Abstract

Tunneling in urban areas has always encountered many uncertainties, which if not considered in both analysis and design of the tunnels, will cause unexpected events during tunnel construction. Obstacles are among the most remarkable uncertainties in tunneling that affect the tunnel construction process. The obstacles in urban tunneling include municipal utilities, surface and sub-surface structures, channels, wells, storages, and unknown cavities. Tehran Metro Line 7 in Iran is no exception to the rule, and has been grappling with the obstacles. In this work, we investigate the effect of the existence of wells and unknown cavities in the zone of influence of excavated tunnels by EPBM. The innovation of this research work is in the EPB tunnel design encountering wells and cavities that are as risky as the adjacent underground structure. In this work, we use a numerical simulation of the 3D finite difference method (FDM) so a series of parametric studies based on the numerical model are examined using the well and unknown cavity geometry and their location relative to the tunnel in alluvium. According to the results obtained, a major disturbance occurs in the near field of the well–tunnel, and the interaction problem happens in front of the tunnel face. The numerical outcome indicates that the most critical state of the ground settlement by EPBM happens when the well and unknown cavity are located in the face of the tunnel. It is also proved that the ground behavior is different for each part of EPBM such as ahead of the face, cutter head, shield, and segmental lining parts.
土压平衡机挖掘隧道与地下障碍物的相互作用,案例研究:德黑兰地铁7号线
城市地区的隧道施工一直面临着许多不确定性,如果在隧道的分析和设计中不考虑这些不确定性,就会在隧道施工过程中引发意想不到的事件。障碍物是影响隧道施工过程的最显著的不确定性因素之一。城市隧道施工中的障碍包括市政公用设施、地表和地下结构、通道、水井、仓库和未知洞穴。伊朗德黑兰地铁7号线也不例外,一直在努力克服障碍。在这项工作中,我们研究了EPBM在开挖隧道影响区内存在井和未知空腔的影响。这项研究工作的创新之处在于EPB隧道的设计遇到了与邻近地下结构一样危险的井和洞。在这项工作中,我们使用了三维有限差分法(FDM)的数值模拟,因此使用井和未知空腔的几何形状及其相对于冲积层中隧道的位置,对基于数值模型的一系列参数研究进行了检查。根据所得结果,井洞近场发生了较大的扰动,相互作用问题发生在掌子面前方。数值结果表明,当井和未知空腔位于隧道表面时,EPBM引起的地面沉降处于最临界状态。还证明了EPBM的每个部分的地面行为是不同的,如工作面前方、刀盘、盾构和管片衬砌部分。
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来源期刊
Journal of Mining and Environment
Journal of Mining and Environment MINING & MINERAL PROCESSING-
CiteScore
1.90
自引率
25.00%
发文量
0
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