摘要
为研究后施工隧道爆破开挖对邻近隧道的影响,以格鲁吉亚E60高速公路隧道为工程背景,通过对大断面浅埋双线隧道爆破开挖进行数值模拟,探究爆破荷载对不同间距、不同埋深、不同围岩等级的邻近隧道振速的影响。结果表明:爆破荷载以后施工隧道掌子面为中心向四周围岩传播;在邻近隧道距爆源前方5 m的断面处围岩振速达到最大值,邻近隧道中爆源前方振速大于后方振速,且迎爆侧振速远远大于背爆侧振速,迎爆侧振速衰减速率大于背爆侧振速衰减速率,邻近隧道拱腰受到爆破荷载的影响最明显;邻近隧道围岩的x方向振速最大,z方向振速次之,y方向振速最小;不同条件下隧道间距、隧道埋深和围岩等级均与邻近隧道围岩及初期支护振速成反比,其中围岩等级对邻近隧道爆破的影响最显著。
The blasting load generated by the blasting excavation of the tunnel has an impact on the adjacent building structure.In order to study the influence of the blasting excavation of the post-construction tunnel on the adjacent tunnel,this paper takes the E60 highway tunnel in Georgia as the engineering background.Through the numerical simulation of the blasting excavation of the large-section shallow-buried double-track tunnel,the influence of the blasting load on the vibration velocity of the adjacent tunnel with different tunnel spacing,tunnel buried depths and surrounding rock grades was explored.The results showed that the blasting load propagated from the tunnel face of the later construction tunnel to the surrounding rock,and the vibration velocity of the surrounding rock reaches the maximum value at the 5 m section in front of the adjacent tunnel from the blasting source.The vibration velocity in front of the adjacent tunnel from the blasting source is greater than that behind it.In addition,the vibration velocity of the facing-blasting side of the adjacent tunnel is much larger than that of the back-blasting side,and the attenuation rate of the vibration velocity of the facing-blasting side is greater than that of the back-blasting side,in which the arch waist of the adjacent tunnel is most obviously affected by the blasting load.The maximum vibration velocity of the surrounding rock of the adjacent tunnel is in the x-direction,followed by the z-direction and the minimum in the y-direction.Under different conditions,the tunnel spacing,tunnel burial depth and surrounding rock grade are inversely proportional to the vibration velocity of the surrounding rock and initial support of the adjacent tunnel,in which different rock level on the adjacent tunnel blasting effect is the most significant.
作者
梁世凡
晁晓辉
魏永冬
王光勇
郭佳奇
LIANG Shifan;CHAO Xiaohui;WEI Yongdong;WANG Guangyong;GUO Jiaqi(College of Civil Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China;CCCC Second Highway Engineering Co.,Ltd.,Xi’an 710065,Shaanxi,China)
出处
《高压物理学报》
CAS
CSCD
北大核心
2023年第5期182-194,共13页
Chinese Journal of High Pressure Physics
基金
企业委托课题(H21-478)。
关键词
后施工隧道
爆破开挖
爆破荷载
邻近隧道
振速
post construction tunnel
blasting excavation
blasting load
adjacent tunnels
vibration velocity
