Stress Analysis of Gas Pipeline Under Seismic Action in Tunnel

Nowadays, the stress analysis mostly aimed at general buried pipelines. And few of the gas pipelines in tunnel (especially under the seismic action) were analyzed. Therefore, it is necessary to analyze the stress distribution of gas pipeline under seismic action in tunnel. In this paper, CEASAR II software was used to establish the stress model of China-Myanmar XX tunnel pipeline under seismic action, based on the seismic spectrum. A pipeline dynamic stress analysis was performed by inputting spectral parameters of gas pipeline, and the results indicated whether or not the pipeline displacement and stress under a violent seismic action would conform to specification. We came to that: (1) In general, the most dangerous section of the pipe is the bend. Measures to control stress should be taken to reduce the stress. (2) Axial seismic action and comprehensive seismic action effected by greater impact on pipelines. Therefore, the stress variation at the axial seismic and comprehensive seismic action should be focused on. (3) Through the displacement checking of the pipeline, the effect of axial seismic action and comprehensive seismic action to displacement was larger. (4) Unlike buried pipeline, the axial displacement was large compared to other two direction displacement. And strengthening the monitoring efforts was necessary.