Vibration Impact Evaluation On Surrounding Enviroment And Control Technology Research Of Blasting Construction In City Tunnel

In recent years,as China’s urbanization process accelerated markedly,city tunnels and other urban transport projects are emerging.Compared with the mountain tunnel, city tunnel was buried more shallowly,with much more buildings above it.When we take the method of drilling and blasting to build it, Vibration will not only affect the structural safety of nearby buildings,but also interfere the normal life and work of citizens.How to evaluate the impact of the blasting vibration on the surrounding environment and how to control this negative effect is a significant research.This research is mainly about the effect of tunnel blasting vibrarion on the surrounding buildings and people in the background of ChongQing Yuzhong connection tunnel.The main research work and achievements is reflected in the following areas.(1)Analyze the earth’s surface velocity distribution of tunnel drilling and basting construction through the three-dimensional numerical simulation methods. Calculations show that the space excavated and the existing neighborhood tunnel amplify the vibration effects.Evaluate the structural safty of buildings above ChongQing Yuzhong connection tunnel by the results of calculation and field test.(2)Analyze the vibration response characteristics of the nearby subway station through the three-dimensional numerical simulation methods. Calculations show that the straight wall of subway station closed to the explosion source has the maximum velocity.Evaluate the structural safty of subway station by the results of calculation.(3)Research the psychology feedback of people of different gender and age to blasting vibration through the field investigation and statistical regression methods.Get a standard velocity value formula about people’s psychology feedback based on the theoretical derivation.(4)Optimize the blasting construction sector depending on the actual engineering situation,and mainly study the damping method which is to combine mechanical excavation with blasting excavation. Numerical simulation results and measured data indicate that the combination construction method can effectively control the surface velocity.