摘要
为提高高烈度地震区隧道软硬围岩交界段的抗震安全性,依托乌鲁木齐地铁1号线某区间隧道工程,采用振动台模型试验对隧道软硬围岩交界段纤维混凝土二衬的抗震性能进行研究。研究结果表明:硬岩部分隧道结构的安全性主要由围岩﹣衬砌间的运动相互作用控制,软岩部分隧道结构的安全性由围岩﹣衬砌间的运动相互作用和地震惯性力共同控制;纤维混凝土二衬提高了支护结构的强度/刚度和韧性,由于硬岩部分隧道结构承受的地震惯性力增加很小,同时围岩﹣衬砌间的运动共同作用改善不明显,结构安全系数最小值增加较大,增大百分比最大达71.40%;软岩部分隧道采用纤维混凝土二衬后,支护结构抵抗较大地震惯性力的作用效果显著,但同时增强了围岩﹣衬砌间的运动相互作用,结构安全系数最小值增大百分比小于硬岩部分,增大百分比最大为29.11%;综合考虑地震动峰值加速度、纵向应变、接触应力及结构内力等指标,同体积纤维掺量条件下,隧道软硬围岩交界段钢纤维混凝土二衬的抗震性能及结构安全性优于玄武岩纤维混凝土二衬。研究成果可为强震艰险山区交通隧道抗震性能的提高提供参考。
In order to improve the seismic safety of interface section of soft and hard surrounding rock of the tunnel in the high intensity earthquake area,the seismic performance of the fiber reinforced concrete secondary lining is studied based on the tunnel project of Urumqi Metro Line 1.Using the method of shaking table model test,the research of this paper is completed,and the research results are as follows.The structural safety of tunnels in hard rock is mainly controlled by the movement interaction between surrounding rock and lining,while that in soft rock is controlled by the seismic inertia force and the movement interaction between surrounding rock and lining.The strength and toughness of the lining structure are improved by the fiber reinforced concrete secondary lining.Because of the small increase of the seismic inertia force borne by the tunnel structure in hard rock,and the movement of surrounding rock and lining is not improved obviously,the minimum value of the structural safety coefficient increases greatly,and the maximum increase percentage reaches 71.40%.After using fiber reinforced concrete lining in soft rock,the effect of the lining structure to resist larger earthquake inertia force is significant.At the same time,the movement interaction between surrounding rock and lining is enhanced.The minimum increase percentage of structural safety factor is smaller than that in hard rock,and the maximum increase percentage is 29.11%.Considering the seismic peak acceleration,longitudinal strain,contact stress and structural internal force,the seismic performance and structural safety of steel fiber reinforced concrete are better than that of basalt fiber reinforced concrete under the condition of the same volume of fiber.The research results can provide reference for the improvement of seismic performance of traffic tunnels in mountainous areas with strong earthquakes.
作者
崔光耀
宋博涵
王道远
肖剑
CUI Guangyao;SONG Bohan;WANG Daoyuan;XIAO Jian(School of Civil Engineering,North China University of Technology,Beijing 100144,China;Key Laboratory of Transportation Tunnel Engineering of Ministry of Education,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;Department of Civil Engineering,Hebei Jiaotong Vocational and Technical College,Shijiazhuang,Hebei 050091,China;MCC Communication Construction Group Co.,Ltd.,Beijing 100011,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2021年第S01期2653-2661,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51408008)
北京市青年拔尖人才培育计划项目(CIT&TCD201704013)。
关键词
隧道工程
软硬围岩交界段
纤维混凝土
抗震性能
模型试验
tunneling engineering
interface section of soft and hard surrounding rock
fiber reinforced concrete
seismic performance
model test
