Study On The Vibration Effects Of Adjacent Buildings Caused By Blasting Excavation In Tunnel

Based on the vibration problems of surface buildings caused by tunnel blasting excavation at the railway station in Qingdao Metro 3,and according to the survey materials and the related data about buildings near the tunnel,regarding the rock-soil mass,the buildings and the tunnel as a whole model,the present study compares and analyses the field measurement data with the stimulating results to make sure the safety of buildings and the elevation amplification effect on buildings by using ABAQUS to stimulating and analysing and taking the vibration velocity from the three directions of horizontal radial,tangential,and vertical as the standard to control the effects on blasting vibration of tunnel.On that basis,this study research studies the horizontal distance between the buildings and the tunnel face by numerical modeling and the effects of depth of tunnel on the vibration velocity of the buildings at the measuring points.To investigate the vibration velocity elevation amplification effect;In the end,this study tries to optimize the Sadaovsk formula stimulate the process of the tunnel blasting,and verify the reliability optimization formula.The main research work of this paper is as follows:(1)Try to attain the distribution of rock,the mechanical parameters about the layers of rock and soil body and the parameters of the distribution and structures of the buildings near the tunnels.according to making geological surveys and referring to related materials;Determine the foundation,the distribution of rock and soil body and the type of buildings by combining Safety Regulations For Blasting with National Standard For Engineering Rock Mass Classification.(2)Try to determine the Rayleigh damping coefficient of the rock-soil mass in the region,according to the determinate parameters about the surrounding rocks and buildings and the geological and blasting parameters.simulation of tunnel blasting excavation using ABAQUS finite element software,and then determine the tunnel blasting hole amplification effect of the scope,to the direction of excavation in rock tunnel hole effect is obvious,the magnification for 1.0594-1.3427 times,and the distance is less than twenty meters;hollow effect perpendicular to the direction of the tunnel is not so obvious,when the distance is less than seven meters,the amplification of 1.08-1.2805 times.(3)According to the blasting construction scheme and building related parameters,simulation analysis of tunnel blasting construction on the building vibration velocity measured points,and compared with field monitoring data;analysis of influence of blasting vibration on buildings construction safety,according to the simulation results to determine the influence of blasting vibration and the changes over time,the simulation results and monitoring results close to the maximum error is0.0524cm/s,The average error of plus or minus 15%;The top in the monitoring of vibration measuring points is 3.59 times faster than the bottom point vibration velocity,the magnification of 3.14 times?(4)Respectively to determine the effect of depth and horizontal distance measurement points on the vibration velocity,when the horizontal distance is less than twelve meters,along with the increase of horizontal distance of vibrationvelocity decays rapidly,when more than twelve meters,the attenuation of vibration velocity tends to be stable;with the increase of the depth of the buried depth,the vibration velocity of each layer is stable,and the influence of the elevation amplification effect is more and more small.