摘要
巴陕高速米仓山特长隧道为我国目前在建最长公路隧道,全长约13.8 km。利用三维激光扫描技术高速率、高精度获取对象表面三维坐标的优势,对米仓山隧道LJ2标段右线施工过程中的超欠挖、二衬厚度、掘进面爆破效果进行了检测,并对开挖断面围岩周边收敛和拱顶下沉进行了变形监测。结果表明,检测段隧道超挖区域比例占到81%,其中超挖0~20 cm的占62%,欠挖0~10 cm的为14%;二衬厚度选取不同里程、相同位置121个位置进行分析,最大厚度0.662 m,最小0.456 m,平均厚度0.564 m;掘进面爆破深度约为3.048 m,爆破方量为254.065 m3;K54+030断面围岩周边收敛6 d最大收敛变形量为9.5 mm,拱顶下沉监测点6 d最大变形量为5 mm。
Micangshan extra-long tunnel is the longest highway tunnel under construction in China with the total length of 13.8 km.3D laser scanning technology has the advantages of high-speed and high-precision to obtain the surface of the objects＇ three-dimensional coordinates. The technology is used to monitoring and analyzing the tunnel＇s overbreak-shortbreak, thickness of secondary lining, blasting effect of tunnel face, rock＇s deformation of eireumjacent convergence and vault settlement.The results showed that tunnel＇s overbreak area is accounted for 81% ,0N 20 cm overbreak area is accounted for 62% ,0N 10 cm shortbreak area is accounted for 14% in the experimental section;the biggest, smallest and average thickness of secondary lining are 0. 662 , 0. 456 and 0.564 m respectively; blasting depth of tunnel face is about 3.048 m and the rock volume is 254.065 m3 ;maximum circumjacent convergence deformation and vault settlement are 9.5 mm and 5 mm in K54＋030 section during 6 days.
作者
刘欢
王立娟
裴尼松
赵鹏
马松
肖梦
LIU Huan WANG Lijuan PEI Nisong ZHAO Peng MA Song XIAO Meng(Sichuan Academy of Safety Science and Technology, Chengdu 610045, China Major Hazard Measurement and Control Key Laboratory of Sichuan Province,Chengdu 610045, China)
出处
《测绘通报》
CSCD
北大核心
2017年第9期83-87,115,共6页
Bulletin of Surveying and Mapping
基金
国防科工局产业化应用项目(87-Y40G06-9001-15/18)
四川省科技厅国际合作计划项目(2017HH0085)
四川省安全生产科技项目(scaqjgjc_stp_201613/14/17/27
aj20170518194207)
关键词
三维激光扫描技术
米仓山特长隧道
超欠挖
二衬厚度
爆破效果
周边收敛
拱顶下沉
3D laser scanning technology
Micangshan extra-long tunnel
overbreak-shortbreak
thickness of secondary lining
blasting effect
circumjacent convergence
vault settlement
