Mechanical Analysis of Partially Exposed Natural Gas Pipelines under Rockfall Impact
With a large number of natural gas pipelines being laid in geological disaster prone areas,flood scouring and rock-falling impact bring great risks to the safe operation of natural gas pipelines.The impact of falling rocks can easily cause damage to the pipeline anti-corrosion coating,local deformation and instability,and even rupture of the pipeline.In order to improve the safety operation and control level of natural gas pipelines in geological disaster prone areas,ABAQUS software is used to simulate the impact process of rockfall on partially exposed natural gas pipelines caused by flood erosion.The sin-gle factor method is used to analyze the variation law of the maximum Mises stress of a partially exposed pipeline under different engineering conditions such as exposed pipeline height,pipeline wall thick-ness,pipeline operating pressure,rockfall radius,and rockfall velocity after being impacted by rockfall.The results show that the maximum Mises stress of the partially exposed pipeline always appears at the contact point after being impacted by falling rocks.The pipeline wall thickness is negatively correlated with the maximum Mises stress of the pipeline,while the radius of falling rocks,impact velocity,and internal pressure of the pipeline have a significant positive correlation with the maximum Mises stress of the pipeline.The radius of falling rocks is an important factor affecting the maximum Mises stress of the pipeline.When the radius of the falling rock is greater than 1.0 m,the maximum Mises stress will ex-ceed the yield strength of pipe X70.The analysis results can provide theoretical basis for the design,lay-ing,engineering protection,and monitoring and warning of natural gas pipelines in areas prone to geological disasters.
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