摘要
Abstract
Since the entrance of the existing tunnel is guided by a small cross-section of rail transportation,considering the construction of the second line after disaster prevention,rescue and drainage,it is necessary to expand the cross-section.Through the methods of theoretical analysis,field verification and optimization,the actual situation is tested and analyzed on the basis of the analysis of engineering geological characteristics.Furthermore,the advantage conditions of controlled blasting for horizontal guide and expansion excavation of additional tunnel are put forward,the dispersion of ignition delay of high position millisecond detonator is selected,the amount of single blasting is reduced,and the technology of accurate time delay and peak reduction is brought into full play.The construction according to the proposed tunnel expansion and excavation controlled blasting scheme has achieved remarkable results,which can ensure the normal construction of the tunnel and the safety of personnel,and the safe operation of the existing railway has laid a solid foundation for the smooth construction of the project,and meanwhile provides a good reference for blasting in mines,highways,railways,municipal and other similar tunnel projects.关键词
隧道/爆破/振动影响/既有线现场测试/工程难点Key words
tunnel/blasting/vibration impact/on site testing of existing lines/engineering difficulties分类
交通运输
