STRESS ANALYSIS FOR APRON VERTICAL PIPES TAKING ACCOUNT OF PIPE-SOIL COUPLING INTERACTION

Kerosene supply through apron network is one of the major methods for civil aviation kerosene supply. In practical engineering, vertical pipes in apron network maybe deformed or even broken due to slippage of concrete pavement. In this work, for sake of studying the mechanism for vertical pipes deformation and damage, FEM analysis has been performed on apron vertical pipes with different norms and tee types, in which P-y curves has been applied to simulate interaction between pipe and soil. Parameters for P-y curves have been determined through indoor physical model tests. The results show that the section with high stress besides tee in the bottom came out as result of backfill soil. And the stress distribution on the vertical pipes is related to the backfill layer distribution and slippage of concrete pavement. At last, through analysis of certain field case, failure point is ascertained, which is in accordance with test result.