Abstract：Research purposes: A 6.9 magnitude earthquake with an intensity of 9 degrees occurred in Menyuan County, Qinghai Province on 8 January 2022, which caused severe damage to the Daliang Tunnel and the Liuhuanggou Bridge of the Lanzhou-Urumqi High Speed Railway. This paper summarizes the earthquake deformation damage through seismic damage investigation and monitoring analysis, and provides an in-depth analysis of deformation laws and seismic damage remediation methods. Research conclusions: (1) The Menyuan earthquake caused varying degrees of damage to the Daliang Tunnel, with misalignment and twisting of the tunnel near the F5 fracture zone and structural damage, decaying towards both ends of the cavern, with lining cracks, spalling off blocks and circumferential cracks (lines) dominating. (2) The tunnel can be divided into misaligned sections, strongly affected sections and seismic damaged sections according to the degree of damage. In the case of severe damage, the tunnel needs to be dismantled and rebuilt, using the principles of circular section form, laying a damping layer between the initial support and the secondary lining, and setting a 2~3 cm wide deformation joint between sections. (3) According to the relative relationship between the tunnel and the fault, the tunnel is divided into two categories: through active fractures and near active fractures, using different design methods to provide a basis for the design and construction of tunnels near faults. (4) The research results are of significance to the research on the seismic mechanism, seismic design and vibration isolation technology of high intensity earthquake and active fault tunnels in China.
李祥,万永革,崔华伟,等.2016年1月21日青海门源Ms6.4地震构造应力场[J].华北地震科学,2016(2):36-41.Li Xiang, Wan Yongge, Cui Huawei,etc. Tectonic Stress Field of 2016,Ms6.4 Menyuan,Qinghai Earthquake[J].North China Earthquake Sciences,2016(2):36-41.
[2]
桂林理工大学.门源6.9 级地震破裂对铁路与高速公路工程的破坏性调查[R]. 桂林:桂林理工大学,2022.Guilin University of Technology. Destructive Investigation on Railway and Expressway Engineering Caused by the Rupture of Menyuan M6.9 Earthquake[R]. Guilin:Guilin University of Technology,2022.
[3]
张永双,姚鑫,郭长宝,等.青藏高原东北地震地质灾害成灾背景[M].北京:科学出版社,2014.Zhang Yongshuang,Yao Xing, Guo Changbao,etc. Background of Seismic Geological Disasters in Northeast Qinghai-Tibet Plateau[M]. Beijing: Science Press,2014.
[4]
潘桂棠,刘宇平,郑来林,等.青藏高原碰撞构造与效应[M].广州:广东科技出版社,2013.Pan Guitang, Liu Yuping, Zheng Lailin,etc. Collisional Structure and Effect of Qinghai-Tibet Plateau [M].Guangzhou:Guangdong Science and Technology Press, 2013.
[5]
中铁第一勘察设计院集团有限公司.大梁隧道至祁连山隧道段地震灾后评估报告[R].西安:中铁第一勘察设计院集团有限公司,2022.China Railway Frist Survey and Design Institute Group Co. Ltd. Post Earthquake Assessment Report of Daliang Tunnel to Qilianshan Tunnel Section [R]. Xi'an:China Railway Frist Survey and Design Institute Group Co. Ltd, 2022.
[6]
中铁第一勘察设计院集团有限公司.大梁隧道、祁连山隧道门源地震灾后结构安全评估及整治方案[R].西安:中铁第一勘察设计院集团有限公司,2022.China Railway Frist Survey and Design Institute Group Co. Ltd. Structural Safety Assessment and Treatment Scheme of Daliang Tunnel and Qilianshan Tunnel after Menyuan Earthquake [R]. Xi'an:China Railway Frist Survey and Design Institute Group Co. Ltd, 2022.
[7]
中铁第一勘察设计院集团有限公司.大梁隧道、祁连山隧道门源地震灾后调查报告[R].西安:中铁第一勘察设计院集团有限公司,2022.China Railway Frist Survey and Design Institute Group Co. Ltd. Investigation Report of the Daliang Tunnel and Qilian Mountains Tunnel after Menyuan Earthquake[R]. Xi'an:China Railway Frist Survey and Design Institute Group Co. Ltd, 2022.
2022, Vol. 39 
版权所有 © 2014 《铁道工程学报》编辑部