Vibration Analysis of Blasting Demolition Construction of Diaphragm Wall in Existing Subway Station
When the shield tunneling is hindered by the diaphragm wall,the blasting demolition construction is an efficient technical method.Based on the blasting project of Balitai Station of Tianjin Metro Line 7,the displacement change and vibration propagation law of the subway station and surrounding buildings are studied and analyzed by numerical simulation and field monitoring.MIDAS/GTS-NX finite element software is used to build a 3D model and the accuracy of the model is verified by on-site monitoring data.The result shows that blasting vibration velocity basically matches the simulation results at the monitoring points and both meet the safety specifications;The blasting vibration spreads rapidly outwards from the center of the blast holes.After reaching the peak,it gradually decays and the vibration velocity decreases to about 2 cm/s beyond 10 m.
国家科技期刊平台
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