Characteristics Of Buildings Responding To Tunnel Blasting Vibration

At present, many large cities are building subway or have listed in the plan. And some coastal cities will also build seabed tunnels, such as guangzhou, shenzhen, Qingdao, etc. Most of the tunneling engineering should be carried out with the method of blasting. The micro vibration caused by blasting may do some harm to buildings around. So how to control the bad effect of blasting micro vibration effectively and make sure the safety of buildings and the carrying out of engineering have become an important subject which need to be solved.Relying on Kiaochow bay Cross-harbor Tunnel Guide Line Project, in-situ monitoring experiment was carried as the main research method. By the application of intelligent monitor UBOX5016, blasting vibrations of buildings were along yunnan road tunnel monitored. Two buildings were selected as research object. They were 33 layer frame shear structure high-rise building and 7 layer masonry structure building. Through analyzing data of blasting vibration, characteristics of building responding to tunnel blasting vibration were studied.For researching two factors of blasting charge and blasting center distance, this paper putted forward a new concept—dynamite-distance ratio and beta formulas were given. Through analyzing relation of dynamite-distance ratio and blasting vibration of buildings, this paper putted forward a new method of dividing building blasting vibration level area. Based on dynamite-distance ratio, the ground was divided into three grades areas:The first level area is blasting vibration disturbance area. The second grade area is blasting vibration smooth area. The third grade area is blasting vibration disappear area.