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青海门源M_(S)6.9地震同震破裂的隧道破坏效应与启示 被引量:1

The tunnel damage effects and implications of the coseismic rupture of the Menyuan M_(S) 6.9 Earthquake in Qinghai,China
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摘要 2022年1月8日青海省门源发生M_(S) 6.9地震,导致兰新高铁大梁隧道发生严重变形破坏。综合野外调查资料、InSAR地表变形数据及轨道控制网(CPⅢ)监测结果等,深入研究了青海门源M_(S) 6.9地震同震破裂带对兰新高铁大梁隧道造成的变形破坏特征。结果表明,海原断裂带冷龙岭-托莱山断裂段为此次地震的发震断裂,并形成长约21.5 km的同震地表破裂,变形性质以左旋走滑为主,地表的最大左旋位移约为3.1 m。同震破裂带在穿过大梁隧道部位时,导致隧道工程发生严重损坏,最严重的变形破坏集中出现在主破裂带两侧各60 m范围内。对比隧道变形量观测结果和同震地表破裂变形特征可知,隧道区跨断裂的最大垂直位移约为91.6 cm,最大左旋位错量约为2.88 m,冷龙岭断裂与大梁隧道夹角约为60°,经换算后对应的发震断裂最大左旋位错量约为3.08 m,指示同震地表破裂的最大走滑位错量与穿过隧道的断裂最大位错量基本一致,表明隧道工程在显著的同震变形中难以起到抗断作用。此次研究成果可为类似穿越活动断裂带的铁路工程规划建设及震害防治提供科学参考与借鉴。 On January 8,2022,a magnitude 6.9 earthquake occurred in Menyuan County,Qinghai Province,causing severe deformation and damage to the Da Liang Tunnel of the Lanzhou–Xinjiang high-speed railway,which is the first railway tunnel project broken by strike-slip earthquake in China.Through comprehensive analysis of field investigation data,InSAR surface deformation data,and monitoring results from the track control network(CPⅢ),this study delves into the characteristics of deformation and damage caused by the coseismic rupture zone of the Menyuan M_(S) 6.9 earthquake on the Daliang Tunnel.The results indicate that the Haiyuan Fault Zone's Lenglongling–Tuolaishan fault segment is the seismogenic fault for this earthquake,forming a coseismic surface rupture zone approximately 21.5 km long.The dominant deformation nature is left-lateral strike-slip,with a maximum left-lateral displacement of about 3.1 m.As the coseismic rupture zone intersects the Daliang Tunnel,it severely damages the tunnel structure,with the most intense deformation and damage concentrated within 60 m on either side of the central rupture zone.Comparing the observed tunnel deformation with the characteristics of coseismic surface rupture deformation,it is evident that the maximum vertical displacement across the fault zone in the tunnel area is approximately 91.6 cm,with a maximum left-lateral offset of about 2.88 m.The angle between the Lenglongling fault and the Daliang Tunnel is approximately 60°,and the calculated maximum left-lateral offset of the seismogenic fault is about 3.08 m.This indicates a close alignment between the maximum slip offset from coseismic surface rupture and the fault's maximum offset across the tunnel,suggesting that the tunnel structure struggles to resist significant coseismic deformations.The findings of this study can serve as a scientific reference for the planning,construction,and seismic damage prevention of railway projects crossing active fault zones.
作者 阎渊 YAN Yuan(Geological Subgrade Design Institute,China Railway First Survey and Design Institute Group Co.LTD.,Xi'an 710000,Shaanxi,China)
出处 《地质力学学报》 CSCD 北大核心 2023年第6期869-878,共10页 Journal of Geomechanics
基金 中铁第一勘察设计院集团有限公司重大专项(2022KY56(ZDZX)-02) 陕西省重点研发项目(2023-YBSF-238)。
关键词 门源地震 兰新高铁大梁隧道 海原断裂带冷龙岭-托莱山段 同震地表破裂 铁路隧道震害 Menyuan earthquake Daliang tunnel of the Lanzhou–Xinjiang high-speed railway Lenglongling–Tuolaishan section of the Haiyuan fault coseismic surface rupture railway tunnel earthquake damage
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