Response Characteristics of Cross-Fault Buried Gas Pipeline under Fault Movement: A Case Study Based on Stress-Strain Characteristics and Plastic Dissipation Energy

摘要

Buried gas pipeline is the lifeline of national economy, and inevitably crosses fault when pass through rivers and mountains. In view of this, it is of great necessity to make clear the response characteristics of buried gas pipeline under different fault movements. In this paper, the software ABAQUS was used to carry out related studies. On the basis of nonlinear theory of materials and structures, contact model was used to simulate slide, separation, and closure between pipeline and soil. The application of the constitutive three-fold line model and Mohr-Coulomb model in the simulation were realized. The boundary condition was determined by considering the application of fault displacement. The influence of different fault types was studied by stress/strain-pipe axial length curves. In addition, the deformation, distribution of stress and strain, location of potential damage, and interaction between pipeline and soil under different fault movements were analyzed. The damage level of pipeline was evaluated by plastic dissipation energy. The analysis results show that the response characteristics of buried pipeline are closely related to the fault type, and relatively sensitive to reverse fault. The peak stress-strain of pipeline appears near both sides of fault, which is the location of potential damage of the pipeline. The analysis results can provide reference for seismic measures of cross-fault buried gas pipeline.