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Construction of a triple-spectacle-shape tunnel beneath operating railway tracks

机译：在运行中的铁轨下方修建三眼镜状隧道

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In the underground section of about 2 km long in the Tokyu Toyoko Line, a triple-spectacle-shape tunnel was constructed by shotcreting method in 210 m section around Tammachi Station. There are few similar examples to refer to design, and thus planning was performed using FEM analysis. In construction planning, attention was given to the treatment of confined groundwater, measures for face stability and settlement prevention. Methods of excavation that would not cause unsymmetrical earth pressure were considered. A monitoring system that can automatically observe and plot data such as track settlement and ground behavior was introduced for the safety of ongoing train operations. On the 55 m long section of tunnel that has the mushroom cross section, monitored results has fully reflected into primary design and excavation steps. This paper describes the series of technical matters from geological investigations, the design and observational construction in the triple-spectacle-shape tunnel.
机译：在东急东横线长约2 km的地下部分中，在Tammachi站周围210 m处通过喷浆法建造了三层眼镜状的隧道。几乎没有类似的示例可以参考设计，因此使用FEM分析进行了规划。在施工计划中，重点关注了承压地下水的处理，工作面稳定和防沉降措施。考虑了不会引起不对称土压力的开挖方法。引入了可以自动观察和标绘数据（例如轨道沉降和地面行为）的监视系统，以确保正在进行的列车运行的安全。在具有蘑菇形横截面的长55 m的隧道断面中，监测结果已完全反映到初步设计和开挖步骤中。本文从地质调查，三眼形隧道的设计和观测施工等方面介绍了一系列技术问题。

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