| In the development of offshore oil and gas resources,the submarine pipeline is an important facility.With the coverage area of the submarine pipeline is getting bigger,it is very necessary to study the dynamic response of submarine pipeline under the action of submarine fault and landslide.The main stress and deformation of the pipeline under the action of faults are located near the intersection of the pipeline and the fault.In this paper,the ABAQUS software is used to establish the nonlinear equivalent boundary shell element model.For the concrete coating of pipeline,only the influence of the friction coefficient between the pipe and the soil is considered.For the pipe soil interaction,I use three soil springs to simulate it.The model is built by the shell element.The equivalent boundary method is used in ABAQUS for the first time.The boundary constraint condition is equivalent to the nonlinear spring in parallel.The rationality of the equivalent boundary is verified by the model.By comparing with the value of Newmark theory and Kennedy theory,.it proves the model is reasonable.Using the established model analysis parameter differences,such as momentum of fault,angles between pipe and fault,fault fracture width,pipe materials,wall thickness of the pipe,diameter of pipe,buried deep,soil near fault.Research results show that the axial tensile stress is main stress of pipe tensile deformation,fault momentum and angles between pipe and fault have a significant impact,the best angles between pipe and fault is 90 degrees.The impact of submarine landslide is similar to submarine fault,we can use the same method to establish a model for analysis.The equivalent boundary is used for the analysis of landslide for the first time.This paper analyzes the width of the landslide area,crossing angle,the time of sliding mudflow,wall thickness of the pipe,diameter of pipe,buried deep,soil near the landslide.The results show that the width of the landslide area are critical factors. |
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