摘要
研究目的:2022年1月8日青海省门源县发生6.9级地震,地震烈度达9度,地震造成兰新高铁大梁隧道和硫磺沟大桥等严重损坏。本文通过震害调查及监测分析,对地震变形破坏情况进行总结,并深入分析变形规律和震害整治方法。研究结论:(1)门源地震对大梁隧道造成了不同程度的破坏,在F断裂带附近隧道错断、扭转,结构损毁,往两端洞口衰减,以衬砌裂损、剥落掉块和环向裂缝(纹)为主;(2)根据损害程度可将隧道分为错断段、强影响段及震损段,在损害严重地段需拆除重建,需采用类圆形断面形式、初期支护与二次衬砌间铺设减震消能层、节段间设置宽2~3 cm变形缝等原则;(3)按隧道与断层的相对关系,分为穿越活动断裂和临近活动断裂两类,采用不同的设计方法,为断层附近隧道设计建造提供依据;(4)本文研究对我国高烈度地震及活动断裂隧道震害机理、抗震设计及减隔震技术研究等具有借鉴意义。
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 Ffracture 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.
作者
李国良
黄双林
LI Guoliang;HUANG Shuanglin(China Railway First Survey and Design Institute Group Co.Ltd,Xi'an,Shaanxi 710043,China)
出处
《铁道工程学报》
EI
北大核心
2022年第8期18-23,共6页
Journal of Railway Engineering Society
关键词
走滑型
断裂
破坏模式
隧道对策
strike slip type
fault
failure mode
tunnel countermeasures
