Abstract: Mining induced ground surface subsidence could result in pipeline bending in a large scale which has great threatening to pipeline safety. An analytical methodology for evaluating stress and strain distribution of buried pipeline crossing mining subsidence area is developed. Ground surface spatial deformation due to mining is predicted by using Probability function integration method. Deformation compatibility equation between pipeline physical elongation and pipeline geometrical elongation is derived taking care of axial pipe-soil friction and steel pipe material nonlinearity; and pipeline stress and strain are calculated with iterative solving method. With proposed method, stress and strain distribution of pipeline crossing mining subsidence area is investigated. The result shows that tensile and compressive deformations at different pipeline segments due to pipe-soil friction associates with pipeline spacial bending deformation. Results of proposed method are close to that of finite element method and it is approved to be competent for investigating the response of buried pipeline crossing mining subsidence with any angle. Finally, effects of mining, pipeline and backfill on pipeline deformation and stress are analyzed; and two simple equations for evaluating the maximum stress and strain of pipeline are developed.

Key words: buried pipeline, mining subsidence, stress and strain, analytical methodology, pipe-soil interaction