Control technology for hydraulic smooth surface blasting in long railway tunnel
In view of the difficult construction problems of Maolusi Tunnel on Chengdu-Guiyang Railway,the blasting excavation method fou the tunnel is under the adverse geological conditions of high crustal stress,fault fractured zone,gas and so on.Based on the analysis of engineering geology and hydrogeology,the blasting excavation method is analyzed and studied by using the methods of theoretical analysis and field investigation.Then the smooth surface hydraulic blasting technology is put forward,and the blasting control parameters,the layout of tunnel blasting holes,the initiation method and the initiation network are determined.Practice shows that according to the control technology and construction parameters of smooth hydraulic blasting for long railway tunnels,drilling,charging and detonation can be well completed,and better blasting effect can be obtained.The stability and structural safety of tunnel surrounding rock can be well guaranteed,which lays a solid foundation for the smooth construction of the project;at the same time,it also lays a solid foundation for railways,highways and mines other types of projects.The similar tunnel project provides a good reference.
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