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Study on Cross Section Optimization in Plateau Railway Tunnels Constructed by Drill and Blast Method
(1. China Railway Economic and Planning Research Institute, Beijing 100038; 2. China Railway Eryuan Engineering Group Co., Ltd.,Chengdu 610031; 3. Southwest Jiaotong University, Chengdu 610031; 4. China Railway Southwest Research Institute Co., Ltd.,Chengdu 611731)
Abstract In this paper, the factors affecting the cross section of the plateau railway tunnel constructed by drill and blast method are analyzed, and emphasis is laid on tunnel cross section optimization from three influencing factors:aerodynamic effect, OCS suspension and underrail structure layout. Analysis and research show that there is room for optimization of tunnel cross section at high-altitude areas in terms of aerodynamic effects. The suspension type and the suspension height of OCS have a significant impact on the height of the tunnel cross section, while the layout of grooves mainly affects the width direction of the tunnel cross section. By combining with different altitude spans,an optimization plan for tunnel cross section is proposed based on altitude classification, and the research results can provide reference for the design of cross sections in similar high-altitude railway tunnel projects.
Abstract：
In this paper, the factors affecting the cross section of the plateau railway tunnel constructed by drill and blast method are analyzed, and emphasis is laid on tunnel cross section optimization from three influencing factors:aerodynamic effect, OCS suspension and underrail structure layout. Analysis and research show that there is room for optimization of tunnel cross section at high-altitude areas in terms of aerodynamic effects. The suspension type and the suspension height of OCS have a significant impact on the height of the tunnel cross section, while the layout of grooves mainly affects the width direction of the tunnel cross section. By combining with different altitude spans,an optimization plan for tunnel cross section is proposed based on altitude classification, and the research results can provide reference for the design of cross sections in similar high-altitude railway tunnel projects.
.Study on Cross Section Optimization in Plateau Railway Tunnels Constructed by Drill and Blast Method[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(4): 196-203
2023, Vol. 60 