Stress and Strain Analysis of Buried Pipeline Subject to Mine Subsidence

Pipeline laid across mine area is threatened by potential mining-induced subsidence. To investigate stress distribution of buried pipeline across subsidence-prone area, an analytical method is proposed based on the assumption that pipeline bending curve is described with the ground deformation predicted by Probability Function Integration Method (PFIM). Basic equation of pipeline physical elongation is derived considering of pipe-soil friction and pipe- material nonlinearity. Based on displacement coordination equation, axial strain of pipeline is calculated by iterative solving method, while bending strain by geometry method. Furthermore, two simple equations are derived to evaluate pipeline stress and bending individually. With proposed method, stress and strain distributions of pipeline laid in subsidence area with different crossing angle are predicted and analyzed. The results of pipeline stress and strain by proposed method are close to that of finite element analysis.