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Analysis of Construction Mechanical Behavior and Parameter Optimization for Subsequent Tunnel Tube of Double-arch Tunnel without Middle Drift
(1. Sichuan Communications Construction Group Co., Ltd., Chengdu 610000; 2. Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu 610031; 3. School of Civil Engineering, Southwest Jiaotong University ,Chengdu 610031 )
Abstract In order to study the construction mechanical behavior of the subsequent tunnel tube and the influence of the supporting time and spatial effect of double-arch tunnel without middle drift, based on the Huangjiaoping doublearch tunnel project of Yi-Jin Expressway, numerical simulation method is adopted, and the construction parameters such as excavation advance, bench length and different staggered distance of left and right faces of the subsequent tunnel are studied. The influence of these parameters on the displacement of surrounding rock, the mechanical characteristics of the initial support of the subsequent tunnel and the secondary lining of the advanced tunnel is further analyzed. The results show that with the increase of the excavation advance, the bench length and the staggered distance of left and right faces of the subsequent tunnel, the surrounding rock displacement, the principal stress of the initial support of the subsequent tunnel and the principal stress of the secondary lining of the advanced tunnel increase dramatically. Among them, the bench length and the staggered distance of left and right faces of the subsequent tunnel have significant effect on the principal stress of the initial support of the subsequent tunnel and the secondary lining of the advanced tunnel, and both shall be strictly controlled in actual construction.
Abstract：
In order to study the construction mechanical behavior of the subsequent tunnel tube and the influence of the supporting time and spatial effect of double-arch tunnel without middle drift, based on the Huangjiaoping doublearch tunnel project of Yi-Jin Expressway, numerical simulation method is adopted, and the construction parameters such as excavation advance, bench length and different staggered distance of left and right faces of the subsequent tunnel are studied. The influence of these parameters on the displacement of surrounding rock, the mechanical characteristics of the initial support of the subsequent tunnel and the secondary lining of the advanced tunnel is further analyzed. The results show that with the increase of the excavation advance, the bench length and the staggered distance of left and right faces of the subsequent tunnel, the surrounding rock displacement, the principal stress of the initial support of the subsequent tunnel and the principal stress of the secondary lining of the advanced tunnel increase dramatically. Among them, the bench length and the staggered distance of left and right faces of the subsequent tunnel have significant effect on the principal stress of the initial support of the subsequent tunnel and the secondary lining of the advanced tunnel, and both shall be strictly controlled in actual construction.
LU Xiaogang1 GENG Jianyu1 PANG Lei1 FAN Jinhai1 LI Liangyong1 FANG Yabiao2,
3 WANG Feng2,
3
.Analysis of Construction Mechanical Behavior and Parameter Optimization for Subsequent Tunnel Tube of Double-arch Tunnel without Middle Drift[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(5): 80-90
2022, Vol. 59 