IMPROVED MODEL TO ASSESS STRESS CONDITION ON BURIED PIPELINES AFFECTED BY MINE SUBSIDENCE
The large surface ground movements induced by underground mining could threaten the safety of the pipelines laid across the subsidence-prone area. Existing analytical methods for the stress analysis of buried pipeline over mine subsidence area were based on the assumption of “thin” pipeline, which limited their applicability. This paper presents the improved model with the capability to determine the stress distribution of the “thick” pipeline. The pipe-soil interaction in this model was also updated to adapt various pipe soil contact conditions. In addition, the time-dependent effects of dynamic subsidence effects were also added to the model. A case of protecting a long section of a buried large-diameter pipeline over two longwall panels in a shallow mine is shown. The stress distribution along the pipeline is determined and the overstressed sections are identified. A partial uncovering plan was developed based on the predicted stress and complicated terrain at the site.
Pipelines; Pipeline; stress; Subsidence; Soils; Soil; Strain; Models; Model; Pipe;