摘要
林芝-拉萨高等级公路米拉山隧道是目前世界上海拔最高的公路特长隧道,且其围岩主要为IV级和V级凝灰岩,隧道裂隙水十分发育,围岩开挖后变形量大,稳定性差,为此,采用监测分析与数值模拟法开展了凝灰岩遇水软化对米拉山隧道开挖与支护影响的研究,实际监测结果表明,凝灰岩遇水软化后对隧道围岩变形的影响十分明显;数值计算结果也表明,凝灰岩遇水软化对米拉山隧道围岩变形、初衬支护和二次支护均有很大的影响。提出围岩注浆堵水和隧道排水是防止凝灰岩遇水软化的重要措施。
Mila Mountain tunnel of Linzhi-lasa superhighway is the highest highway tunnel in the world at present.Most of the surrounding rocks of Mila Mountain tunnel are tuff with ranks of IV and V.The crack water of the tunnel is very rich and the surrounding rocks have large deformation and poor stability after excavation.So,the research on the influences on Mila Mountain tunnels'excavation and supporting when tuff is softened by water is done based on the methods of monitoring analysis and numerical simulation.The actual monitoring results indicate that the influence on deformation of the surrounding rocks in Mila Mountain tunnel is quite obvious when the tuff is softened by water.The results of numerical calculation also make known that it has a large influence on the deformation of surrounding rock and the supporting of initial lining and secondary lining in Mila Mountain tunnel when the tuff is softened by water.The surrounding rock grouting to cut off the water and tunnel drainage are important measures which can solve the negative influences on Mila Mountain tunnels'excavation and supporting when the tuff is softened by water.
作者
杨善成
白永厚
谢全敏
YANG Shancheng;BAI Yonghou;XIE Quanmin(CCCC-SHB Fourth Engineering Co.,Ltd.,Luoyang 471001,China;School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China)
出处
《交通科技》
2018年第2期56-60,共5页
Transportation Science & Technology
基金
西藏自治区重点科研项目(2016XZ01G31)资助
关键词
米拉山隧道
凝灰岩
软化
开挖与支护
Mila Mountain tunnel
tuff
softening
excavation and support
