Studty On The Effect Of Tunnel Blasting Vibration On Ground

In recent years, along with development of underground engineering ,a great deal of tunnels in downtown area will be constructed, in which some tunnels need to be excavated by blasting because of engineering and environment conditions. The vibration effects produced by tunnel blasting will endanger the safety of buildings close to tunnel. For the safety guarantee of buildings in near field blasting,tests and controlling measures on blasting vibration efects are necessary,these seismic effect of blasting and blasting safety control subjects also received extensive attenion.This thesis,by numerical simulation ,finds some laws of waves to the ground vibration .The blasting vibration data at SHIQIAOTOU tunnel was observed, analyzed and processed, and a regular pattern of K andαin two situations of soil and concrete was obtained,and pointed out that the concrete road surface of the blasting vibration decays slower than the soil surface. Another analysis is to compare the dynamic stresses of soil and concrete which are caused by tunnel blasting ,and that can leads to the conclusion that the dynamic stress of concrete by the blasting vibration is greater than that of soil .And,strain was calculated.Compared the blasting vibration of road surface at front of the stope and back,pointed that the blasting vibration of front is greater than that of back,and analyzed the reason with capability method.The vibration response of soil surface resulted from blasting in tunnel is studied by analyzing the numerical calculating results and the measurement results,points that the concrete road will not be destroyed when the vibration velocity is under 1.5cm/s and the acceleration is under 1m/s 2 .