Damage Evolution Analysis Of The Surrounding Rock And RC Frames Structure By Tunnel Blastig Vibration

In the railway,highway,subway and other transformation and new,due to geographical conditions,two or more railway lines to cross and parallel design,the distance is small,blasting disturbance on adjacent tunnel hazards can not be ignored.These are to influence engineering blasting and blasting vibration hazards on the surrounding environmental and safety control.The author puts forward new requirements to the child the yard vehicle access line tunnel in Chongqing metro line three phase two yard was left line tunnel as the background,through field measurement with mathematic model theory method of blasting seismic effect of blasting vibration,displacement,velocity of blasting vibration,blasting vibration acceleration and under the action of blasting mechanics and stress variation are discussed and analysis of sufficient,the vehicle and line tunnel blasting on left line tunnel vibration(Wei Yan)the influence of the situation.This paper aims at The main conclusions are as follows: To explore the influence of blasting vibration wave on the existing tunnel and how to reduce the influence:1 Through the analysis of the blasting seismic wave effect theory,the newly built tunnel blasting excavation of both wear the dynamic effects of tunnel provides a theoretical premise.Starting from explosives,blasting effect of object features and condition of blasting,tunnel blasting excavation Underholing forms such as multi factor,elaborated the blasting effect and the effect of tunnel surrounding rock)of existing.2 From the blasting site measured blasting vibration velocity that the overall size of blasting seismic velocity is away from the explosion source is nearly vibration velocity is,in the X,y,and Z three channel,the maximum speed under normal circumstances appear in the Z channel,some cases maximum speed also appeared in the X or Z channel,which reminds us in the evaluation of blasting vibration velocity harm should not only focus in the Z velocity and elected three channel maximum speed as a criterion.3 By newly built tunnel through existing tunnel model calculation,a blasting charge for certain,tunnel support for non support,applied shotcrete applied secondary lining,with the support of perfect,tunnel lining(rock)the maximum displacement,velocity,acceleration is on a downward trend and applied second lining effect is obvious.4 Simulation results show that with the two tunnels near distance decreases,the newly built tunnel blasting excavation on existing wear under the influence of the tunnel gradually increased,the strong branch support,away from the explosion source is close to reduce blasting vibration effect is better,and weak support in the near distance blasting and to reduce the dynamic effect is not obvious.5 For Tong yard vehicle access line tunnel and rail line 3 Tongjia yard left line tunnel close cross and calculation,it is found that once detonating charge and lining(rock)displacement,speed to accelerate into the direct proportion relationship,distance is close to the proportion coefficient bigger.