Experimental Study of an Oil and Gas Pipeline Across a Landslide Model
Landslides are one of the main geological hazards that cause damage to long-distance buried oil and gas pipelines.This article focuses on shallow soil and lateral landslides,conducts full-scale model tests with large and small pipe diameters.The force response law and deformation failure characteristics of oil and gas pipelines crossing landslides were studied by controlling the slope gradient and displacement through a model box loading device.The results indicate that when the slope gradient is greater than 20°,the strain amplification of the pipeline increases significantly.The pipeline undergoes local buckling at the mid-span position,presenting a symmetrical beam-like bending failure mode as a whole.The ultimate compressive strain value obtained from the experiment is basically consistent with the calculation results of DNV(DET NORSKE VERITAS)regulations and relevant domestic regulations.When the pipeline is in the stage of elastic and elastoplastic deformation,the axial strain measured in the experiment is in good agreement with the results of numerical simulation(PSI model and solid unit model),but when the pipeline buckles and fails,the experimental value is significantly greater than the numerical simulation result.This study provides an important reference for the laying of oil and gas pipelines and landslide prevention in mountainous areas.
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