Study on the calculation method and structural dynamic response of buried pipeline subjected to external explosion load based on multiphase coupling

When the buried pipeline is subjected to external explosion load, stress and deformation will occur. value exceed a specific range, it affect normal use of pipeline. In this paper, multiphase coupled model pipeline, soil fluid within established. The penalty function coupling method used describe load between By specifying boundary conditions system, global solution variational principle soil-pipe-fluid derived. According established calculation method, numerical simulation analysis response carried out. maximum error experimental results about 5%, which verifies accuracy method. soil-pipeline-fluid analyze under load. show that during shock wave propagating in soil, peak pressure different positions gas greater than oil As for structural response, radial displacement reduced by 3.83 mm compared with 3.75%. velocity 1.5 m/s 2.65 larger 1 m/s, increased 5.72%. resistance are both stronger higher velocity, weaker pipeline's be.