Dynamic Behavior and Safety Criteria of Buried Concrete Pipeline System under Blasting

In urban blasting engineering, researching the dynamic response of buried pipeline is a method for evaluating the stability of the pipeline. The dynamic response of buried pipeline under blasting includes peak particle velocity (PPV) and peak effective stress (PES) on the pipeline. This paper aims to analyze the dynamic response of the concrete pipeline with bell-and-spigot joints under a metro-connected aisle blasting, and provide a PPV safety criterion for evaluating the stability of the field concrete pipeline. This includes an analysis of the dynamic response of the concrete pipeline in the field monitoring and numerical simulation. The monitoring results reveal that the PPV is affected by the field factor, such as the explosion source distance, and it is noteworthy that the Sadovsky's formula considering the influence of explosion source distance (data correlation coefficient-0.708) has higher accuracy in predicting the PPV compared to the original Sadovsky's formula (data correlation coefficient-0.632). The dynamic response distribution characteristics of the concrete pipeline are analyzed based on the numerical simulation, and the results show that the PES of the joint is three times stronger than that of the barrel. A PPV safety criterion (1.43 cm/s) is provided for the site to evaluate the stability of the concrete pipeline according to the dynamic response of the pipeline joint.