摘要
为研究爆破作用下隧道软硬围岩过渡段振动特性,以贵州石阡至玉屏(大龙)高速公路老木山隧道为工程背景,对隧道围岩软硬过渡段的爆破振速进行实时监测,并运用FLAC3D数值计算软件对爆破作用下软硬围岩过渡段开挖面动力响应进行模拟和研究。结果表明:软硬围岩过渡段爆破波的传播受临空面放大作用和垂直传播放大作用共同控制,由软岩向硬岩方向发展,横断面最大峰值振速出现在拱脚处;爆破地震波在纵断面上呈现区域变化,掌子面后方成洞区约2 m处有可能出现损伤甚至塌落的危险;爆破诱发质点峰值振速与其造成的损伤范围具有很好的相关性。
In order to study the vibration characteristics of soft and hard surrounding rock transition section of tunnel under blasting,the blasting vibration velocity of soft and hard transition section of tunnel surrounding rock is real-time based on the Laomu Mountain tunnel of Shiqian to Yuping(Dalong)Expressway in Guizhou.The FLAC 3 D numerical calculation software was used to simulate and study the dynamic response of the excavation face of the transition section between soft and hard surrounding rock under blasting.The results show that the propagation of blasting waves in the transition section of soft and hard surrounding rock is controlled by the magnifying effect of the vertical plane and vertical propagation,from soft rock to hard rock,and the maximum peak velocity of cross section appears at the arch.The blasting seismic wave regionally changes in the longitudinal section,and there is a possibility of damage or even collapse at about 2 m behind the tunnel face.The peak velocity of the blast-induced particle has a good correlation with the damage range.
作者
胡其志
唐益新
卢国兴
Hu Qizhi;Tang Yixin;Lu Guoxing(School of Civil Engineering and Environment,Hubei University of Technology,Wuhan 430000,P.R.China;Zhongjiao Luqiao South Engineering Co.,Ltd.,Beijing 101149,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2020年第S01期201-207,共7页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(51609081)
关键词
钻爆法
过渡段
振动
数值模拟
drilling and blasting method
transition section
vibration
numerical simulation
作者简介
胡其志(1969—),男,湖北武汉人,博士,教授,博士生导师,主要从事岩土工程方面的教学及科研工作。E-mail:709317769@qq.com
