Experimental and numerical investigations on predictor equations for determining parameters of blasting-vibration on underground gas pipe networks

As underground gas pipe plays a major role for the onshore and offshore gas transportation system, maintaining record levels built up year by year. However, once a rupture happened during aging underground gas transport process, the consequence of gas blasting incident would pose a deadly threat in the vicinity of accidental location. Ground vibration induced by underground gas pipe blasts is one of the most significant effects that can make a serious impact on surrounding environment and integrated facilities. Based on this, this study performed a combined full-scale experiment and numerical investigations on effects of ground vibration from gas pipe blasting. Dynamic characteristics Peak Particle Velocity (PPV), Peak Ground Acceleration (PGA), Dominant Frequency (DF) of blasting ground vibration concerning the safety of gas transport process were analyzed. Blast-induced displacements with parallel pipe was simulated using LS-DYNA and a series of numerical data were collected for comparison. Modified predictor equations for determining different parameters on behavior of blasting ground vibration with certain distance were proposed based by comparative data. The primarily purpose of this study is to bring a new perspective to better prediction the dynamic characteristics governing ground vibration of the underground gas pipe fails to blast in gas transport process.