Research About Tunnel Controlled Blasting Technology For Baojiashan Tunnel

Though the controlled blasting construction have developed in decades years, but the overbreak and underbreak generated ground disturbance is still a long-term problem confusing tunnel construction. These problems are many reasons for, a construction management aspects, or the construction technology. For technical reasons the fact there are two aspects: the control of blasting and construction technology of principle. Reasonable scientific use of controlled blasting a tunnel boring technology can substantially increase the quality of the tunnel project, effectively reduce construction costs and shorten the construction period. As China's highway construction management standards and quality requirements continue to increase, the controlled blasting of the tunnel is also increasing emphasis on technology. According to the current status of the bursting of the tunnel, given the bursting of a scientific and rational design parameters and options for future excavation of the tunnel blasting design and construction programme has accumulated scientific basis and key technical points.Raised the principle to the rock blasting, the calculation method of amount of explosive is obtained. Explain plain noodles blasting, split the function principle blasting in advance, the parameter is designed, medicine amount computing technology and plain noodles blaste various kinds of factors that result influence analyse. The design principle of explosive construction in tunnel and the blasting parameter are explained in detail in this paper. Combining the smoth blasting parameter and the design of blasting networking in tunnel, the explosive construction process in tunnel is describled. According to project geological condition, excavate section, excavate method, tunnel circulation footage, get into eyes machines and blasting apparatus ,etc. blastingt is designed, confirm porthole assign, figure, depth, angle, powder charge amount, powder charge structure,detonating method, detonating order, circulation homework, etc. rationally., Combine Baojiashan highway tunnel blaste and construct , better settlement is it is it dig to owe to exceed, country rock perturbation and tunnel stand side by side nearly interval homework blasting and interfering, in order to apply to practise in project.