Research On The Influence Of Wanxing Road Tunnel Blasting Construction On Existing High-rise Residential Buildings

In this paper,Wan Xing Road Tunnel in Jiangbei district of Chongqing was used as the research background,with method of field measurement,theoretical analysis,data arrangement and finite element numerical simulation,the generation and propagation rule of blasting seismic wave,analysis of blasting vibration data and the dynamic response of high-rise residential building under blasting seismic wave load was studied,the following are the main research work and results:(1)The high rise residential building which nearest to the middle of the right side tunnel that under the Peng Run Lan Hai neighbourhood is monitored,the actual data of the vibration velocity and frequency in first floor of the residential building under the condition of the blasting construction of the right hole are obtained.The regression analysis is used to get the curve of the relationship between the rate of vibration and the detonating distance under different loading conditions,which provides some reference for the design of the blasting scheme for the 9 line of Chongqing rail transit in the later period.(2)With the help of Midas/GTS NX software,according to the actual situation of the support project,a three-dimensional model is set up to calculate the vibration velocity at the surface,and the accuracy of the model is verified by comparing with the actual monitoring results.Weak interlayer is added in the model.Change law of axial tension and compressive stress of the same building column is studied when thickness of weak interlayer changes from 0m to 20 m.The results show that the attenuation degree of axial tension stress increases with the increase of the thickness of the weak interlayer,and the attenuation degree of the axial compressive stress decreases with the increase of the thickness of the weak interlayer.(3)While the thickness of the weak interlayer is fixed at 5m.Change law of axial tension and compressive stress of the same building column is studied when dip angle of weak interlayer change from 0°to 60°.The results show that the attenuation of the axial tension and compressive stress of the building column increases with the increase of the dip angle of the weak interlayer.Under the condition of 60°,the stress attenuation reaches the peak value.Compared with the 0 °,the axial tensile stress attenuates to about 20%,and the axial compressive stress attenuates to about 11%.