Impact of Goaf Settlement on Gas Pipelines During Coal Mining
In the process of underground coal mining,the land settlement makes the oil and gas pipelines above bear extra load,resulting in a series of safety hazards.In order to study the influence law of goaf settlement on gas transmission pipeline,the finite element analysis software was used to simulate two mining modes,mining along the pipeline axis and mining perpendi-cular to the pipeline axis,and the deformation and stress changes of the pipeline were analyzed.The results show that the equiva-lent stress changes of the pipeline are more stable when the pipeline is mined along the pipeline axis.Mining perpendicular to the axis of the pipeline can keep the position of the pipeline under maximum deformation unchanged,which is convenient for later maintenance.When the vertical pipeline axis is mined,the middle area of the pipeline can change from the minimum stress area to the maximum stress area with the increase of mining width.
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