Study On The Influence Of Underwater Blasting Vibration On Surrounding Buildings

With the rapid development of transportation infrastructure,many cities began to build underground tunnels.Due to the limitations of engineering technology and geological conditions,a considerable part of the subway tunnels pass through the hard bedrock,and the drilling and blasting method is required for excavation.There are often important structures(structures)around the blasting area under the blasting vibration.The safety of buildings is greatly affected.Therefore,in tunnel blasting construction,how to effectively predict and control the dynamic response of buildings in blasting vibration is a key concern and outstanding problem in the current engineering field.In this paper,the effects of underwater blasting on the vibration of surrounding buildings are studied in combination with the actual underwater reef engineering of the immersed pipe section of the Dalian Bay submarine tunnel.Based on the dynamic finite element theory and the LS-DYAN dynamic analysis function,the finite element model conforming to the engineering practice is established.The numerical simulation analysis of the influence of the underwater blasting vibration of the basement of Dalian Bay submarine tunnel on surrounding buildings is carried out..The main works are as follows:(1)On the basis of reviewing a large number of documents and related materials and summarizing the research results of the predecessors,the paper analyzes and analyzes the influencing factors and control standards of blasting vibration on buildings,and provides the influence of underwater foundation blasting construction on surrounding buildings.Theoretical support.(2)Based on the blasting test parameters and data of the harbor basin,a single-hole rock blasting model was established to simulate the growth process of underwater rock borehole rupture gap,and the dynamic strength parameters of the bedroc k were determined.Based on this,a porous differential blasting model was established.The simulation results are in good agreement with the measured results.(3)According to the actual engineering conditions,the finite element model of the Section A pipe joint foundation blasting excavation was established,and the maximum detonation dose of the foundation groove excavation was analyzed in the blasting depth of 6m and the blasting depth of 5.6m.Whether it will affect the safety of the breakwater near the explosion area.(4)According to the actual situation of the project,the finite element model of the Section B pipe joint foundation blasting excavation was established,and the vibration velocity response of the pier at 25 m from the explosion area und er the blasting vibration was analyzed,and the safety of the terminal was estimated.The maximum single-shot dose for a single detonation.