The destructive form and response analysis of buried concrete pipes under the action of internal explosion loads

Abstract

This research analyzes the damage mechanism of subterranean concrete pipelines subjected to internal explosive loads using a mix of field blasting tests and numerical simulations. The field tests reveal that, under the effect of internal explosion loads, axial and circumferential cracks occur in the concrete pipelines, with the crown, invert, and springline being damaged firstly, leading to penetrating cracks. In addition, an arbitrary Lagrangian Euler (ALE) method is used to establish a coupled model of underground concrete pipeline under the condition of internal explosion. The influence of the explosion mass on the destructive effects and dynamic characteristics of the pipeline is investigated, and the internal wall strain at the explosion center and in the central part of the pipeline is analyzed. Furthermore, the propagation and attenuation laws of shock waves in pipelines are investigated, and an attenuation law formula of shock waves inside the pipeline with two ends open is provided, which will be useful for future research.