Mechanical Properties of the Buried Pipeline Under Impact Load Caused by Adjacent Heavy Tamping Construction

Impact load caused by adjacent heavy tamping construction has a significant effect on mechanical properties of the buried pipeline. Based on nonlinearly finite element method, a hammer-pipeline-soil coupling model was established and the process of heavy tamping construction was simulated. Not only the effects of the heavy tamping construction parameters but also the effects of the pipeline parameters on mechanical properties of the buried pipeline under eccentric impact were discussed. In addition, the effects of the eccentricity between hammer and buried pipeline were also taken into consideration. The results show that the impact force which buried pipeline bears decreases with the time during heavy tamping construction. And the impact force increases with the increasing of hammer height and tamping velocity, but decreases with the increasing of eccentricity, radius-thickness ratio, and buried depth. High stress area and equivalent plastic strain which appear at the left top half of the buried pipeline under eccentric impact increase with the decrease of eccentricity, inner pressure, and buried depth while they increase as hammer height, tamping velocity, and radius-thickness ratio increase.