Study on the Security Conditions of Parallel Laying Gas Transmission Pipelines under Blast Loading

With the rapid construction of China's long-distance natural gas pipelines, it is inevitable that in many regions the high pressure pipes are laid parallel and work at the same time. Once one of the pipelines explodes caused by the defects on the pipe body, the third-party damage, or the geological disaster etc., the blast shock wave and the combustion radiant heat may lead to a chain failure reaction to the parallel pipe. This paper focuses on the explosion impact loading, an interaction mode among explosion loading, soil and gas transmission pipeline is established. In order to find out the main factors which influence the security conditions of parallel laying pipelines, the relationships between pipe’s laying space, wall thickness and internal pressure under blast loading are obtained by using LS-DYNA finite element software, accordingly, the limit state of the parallel laying pipelines would be determined. The study will give the theory adding of the parallel laying design of long-distance gas transmission pipelines, and the results have certain reference value to the study and formulation of protection measures.