One Design Method of Pipeline in Mined-Out Area

With the rapid development of oil and gas pipeline construction, there are more and more pipelines have to pass through the mineral deposits area. The surface cracking, subsidence and collapse will be occurred commonly because of the underground goaf after exploitation in mineral deposits area, and pipelines’ safety is faced with hidden troubles. In order to solve the contradiction between the pipeline construction and minerals mining, some research on design method of pipeline in mined-out area was carried out. The goaf subsidence prediction is constituted of subsidence influence factors analysis, surface deformation law analysis and surface deformation forecast. Pipe stress analysis includes stress influence factors analysis and stress model analysis. Combining the pipeline influence factors with the forecasted surface deformation, the pipeline stress analysis model could be built. This paper describes methods developed for the ground surface displacement prediction and the mechanical model of the pipeline/ soil interaction, and some application examples in china.