Study On Safety Control Of Underwater Drilling Blasting Under The Complex Urban Environment

With the development of city traffic, there will be more and more city undergroundengineering crossing river, more and more the city tunnel projects using blastingconstruction, due to the complexity of the city environment, the dynamic failure effect ofunderwater drilling blasting is mainly manifested in two aspects: first, the damage effectof the shock wave in water; secondly, the destructive effect of blasting vibration wave. Inthis paper, combined with construction practice that Guangzhou Zhoutouzui immersedtunnel tube section excavation engineering, around the key question–the safety controltechnology on underwater blasting construction under city complex environment, to carryout two waves on adjacent buildings on failure effect of underwater drilling blasting, theprevention measures on the of blasting for adjacent buildings, the main contents of thispaper include the following aspects:(1)Research on seismic wave propagation in shock blasting water drilling under waterThis paper introduces the concept and classification of engineering blasting underwater, and each type of underwater blasting was analyzed; analyzing the factors ofunderwater drilling blasting water shock wave propagation and its main influence; from theaspect of generation mechanism on blasting seismic wave, wave characteristics、seismicpropagation and attenuation law on earthquake effect of underwater drilling blasting.(2) testing field monitoring of underwater drilling blastingThe blasting vibration system and its monitoring mechanism, and according to theexcavation of foundation ditch blasting sinking environment, selection of blasting testsection of the design of blasting test scheme, and the layout of monitoring point accordingto the needs; blasting vibration monitoring results of underwater drilling blasting seismicwave characteristics of the underwater shock wave solid, impact drilling blasting inverification of water magnitude of the seismic wave propagation.(3) the safety control on underwater blasting vibrationThe paper introduces the safety control on blasting vibration safety criterion and thecommon safety prevention measures; the pipe trench under water blasting vibrationisolation measures put forward some prevention and cure of blasting vibration.