Stress Analyses of Direct-buried Heat Supply Pipeline

Based on the fact, regarding the pipe of direct-buried pipe as cylindrical shell, the article establishes curvilinear coordinates, and analyzes the loading on the pipe. Using elastic thin shell theory, take advantage of boundary condition, the paper establishes the equilibrium equation and obtains the analytic solution of displacement (and orientation). According to this displacement, using physical e quation, the paper acquires the analytic solution of stress (and orientation) at first time.