高烈度地震区铁路隧道震害特征与整治研究

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Abstract Research purposes: To clarify the damage characteristics of tunnel after earthquake and then propose reasonable earthquake damage treatment techniques for high-intensity earthquake area, the relevant research is carried out based on the post-earthquake renovation project for Daliang tunnel in Second Lanzhou-Urumchi double-line. The site investigation is carried out to clarify the disaster characteristics of the Daliang tunnel after the earthquake. Meanwhile, according to geophysical prospecting, drilling and on-site data collection, and based on the comprehensive evaluation of seismic damage, targeted treatment technical measures for the tunnel seismic damage is proposed. Furthermore, in combination with field tests, the application effect of the technical measures proposed in this paper are verified to provide references for similar anti-seismic design for tunnels.
Research conclusions:(1) The surface cracks at the exit section of the tunnel after earthquake are distributed in a feather shape with the characteristics of tension or compression, and the cracks are obviously staggered. (2) The damage of tunnel structure is affected by the fault in a space dependent manner, with prominent characteristic effect. The structure of the entrance and exit sections are shifted to the upper right and the lower left respectively, and the structure dislocation and deformation damage in the core area of the fault are serious. (3) The ground cracks shall be treated by combining layered tamping with cement improved soil and grouting mortar. The comprehensive treatment schemes of "large rigidity circular lining + large reserved deformation+shock absorption and energy dissipation layer+segment design", "grid steel frame + C40 molding concrete" and "crack sealing + base grouting" are proposed for classⅤ,Ⅳ,Ⅲ and below damages, respectively. (4) The field monitoring results show that displacement of secondary lining in whole tunnel is stable, and primary support and secondary lining are mainly characterized by asymmetric stress, but the overall stress is small, which proves effectiveness and rationality of the proposed support scheme.

Key words： high-intensity earthquake area high-speed railway tunnel damage characteristics countermeasures field monitoring

Received: 26 September 2022

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U455

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	WU Shiyan

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WU Shiyan. Research on the Damage Characteristics and Countermeasures of Railway Tunnel in High-intensity Earthquake Area[J]. Journal of Railway Engineering Society, 2023, 40(1): 76-83.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2023/V40/I1/76

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