Field measurement and numerical simulation for influence of blasting excavation on adjacent buried pipelines

When construction of the drilling and blasting method, blasting excavation produced ground motion will adversely affect neighboring already buried pipelines. These will increase the difficulty and risk of the subway construction. Taking the drilling and blasting construction of Qianshan Road Station to Songjiang Road Station interval tunnel in Dalian Metro Line 1 as the engineering background, the attenuation law of blasting seismic wave and the blasting vibration response of buried pipeline are studied by means of field monitoring and numerical simulation. The results show that the settlement curve of the pipeline is in an exponential distribution, which is consistent with the trend of land subsidence. The comparisons show that the numerical simulation of the blasting seismic wave attenuation with distance from the explosion center in agreement with measured results. This indicates that the study of the blasting vibration effect of blasting excavation by using numerical simulation method is feasible. According to the blasting monitoring data, the prediction formula for blasting seismic wave propagation characteristics of Dalian subway tunnel was established by regression analysis method. Combined with the blasting monitoring data and the prediction formula to continue to improve and adjust the blasting parameters, so as to guide the subsequent phases of drilling and blasting construction of subway tunnel. © 2017, Editorial Office of China Civil Engineering Journal. All right reserved.