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A case study on the design of two cross tunnels: Numerical analysis and reinforcement

机译:两座交叉隧道设计案例分析:数值分析与加固

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This paper is a case study on the design procedure and of the application reinforcement method of tunnel crossing section, which includes two very close high-speed railroad tunnel. In the section 1-1 of the Korea High Speed Railroad Project, the research tunnel of this paper is the Kwang Myung (GM) tunnel intersection with inbound tunnel that leads into Marshaling yard. Minimum distance is about 4.8 m (0.33 D) and cross-angle is 37.5 degrees between upper inbound tunnel and lower GM tunnel. This study suggests the estimation procedure of dynamic stability when the dynamic load from train operation is applied. In the dynamic analysis combined reinforcement effect of the mechanical properties of grouted ground and the installed steel pipe is calculated based on the proposed equation. 2-dimensional finite element method is used in the dynamic stability analysis. The results of this study indicate that the vibration is one of the main design parameters for the stabil ity analysis of two closely located tunnels. The results show that the amplitude of propagated stress level is affected significantly depend on the relative distance between two tunnels, but on the other hand the coefficient of lateral earth pressure and reinforcement with large-diameter pipe roof are insignificantly affected to the amplitude of propagated stress level.
机译:本文以隧道横断面的设计程序和应用加固方法为例,该隧道横断面包括两条非常靠近的高速铁路隧道。在韩国高铁项目的1-1节中,本文的研究隧道是Kwang Myung(GM)隧道与入站隧道的交叉口,该隧道通向编组站。上入隧道和下GM隧道之间的最小距离约为4.8 m(0.33 D),交叉角为37.5度。这项研究提出了应用列车运行的动态载荷时动态稳定性的估算程序。在动力分析中,基于所提出的方程,计算了灌浆地面和已安装钢管的力学性能的组合增强效果。二维有限元法用于动力稳定性分析。研究结果表明,振动是两个紧邻隧道的稳定性分析的主要设计参数之一。结果表明,应力分布的幅值受两条隧道之间的相对距离影响很大,但另一方面,侧向土压力系数和大直径管棚的加固对应力的幅值影响不大。水平。

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