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首页> 外文期刊>Advances in civil engineering >Performance of Super-Large-Span Tunnel Portal Excavated by Upper Bench CD Method Based on Field Monitoring and Numerical Modeling
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Performance of Super-Large-Span Tunnel Portal Excavated by Upper Bench CD Method Based on Field Monitoring and Numerical Modeling

机译：基于现场监测和数值模拟的上台CD法挖掘超大跨度隧道门户性能

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摘要

The number of super-large-span tunnels is increasing in both new construction and reconstruction projects in China recently. In super-large-span tunneling engineering, the deformation properties and mechanical behaviors of tunnel portal structure are more complex than those of common tunnel due to the flatter shape and larger construction span. The mechanical behaviors of rock mass change in response to different sequential excavation methods and supporting parameters. The upper bench CD method has been gradually applied in the construction of super-large-span tunnels in China. In this paper, the design parameters for the supporting structure of super-large-span tunnel were studied by the field monitoring and numerical modeling in a case study of Laohushan tunnel. It was found that the crown settlement was larger than the clearance convergence, and the stress of arch was greater than that of the side wall in tunnel portal section. The invert structure was flat with small curvature. Therefore, the shotcrete was mainly subjected to tensile stress. The use of H200?×?200 steel rib with spacing of 60?cm and C25 shotcrete with thickness of 30?cm is recommended. The results of this paper provide basis for the development of design specifications and construction standards for super-large-span tunnels and provide reference for similar projects in the future.
机译：最近中国新建筑和重建项目的超大跨度隧道数量正在增加。在超大跨度隧道工程中，由于更平坦的形状和较大的施工跨度，隧道门壁结构的变形特性和机械行为比公共隧道更复杂。响应不同顺序挖掘方法和支持参数的岩体变化的机械行为。上层CD法逐渐应用于中国超大型隧道的建设。本文在老山山隧道案例研究中，研究了超大跨度隧道支撑结构的设计参数。发现冠沉降大于间隙收敛性，弓的应力大于隧道门壁部分侧壁的应力。逆变结构与小曲率平坦。因此，喷射器主要受拉伸应力。建议使用H200？×200钢肋，厚度为60Ωcm，厚度为30Ωcm，厚度为30°CM。本文的结果为超大跨度隧道设计规范和建筑标准的开发提供了依据，并为未来的类似项目提供了参考。

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