DEM-CFD coupling simulation for road collapse induced by pipeline leakage
A DEM-CFD coupling simulation method is proposed to address the problem of road collapse in-duced by leakage erosion of water supply pipelines,based on the Discrete Element Method(DEM)and Com-putational Fluid Dynamics(CFD)theories.The method combines a geological model of pipeline leakage estab-lished using Particle Flow Code(PFC)with a flow field model established using FiPy to achieve bidirectional coupling of particles and fluids.The study investigates the mechanism of road collapse,as well as the influence of sand erosion rate and leakage orifice width on the formation and development of underground cavities.The results indicate that the disaster induced by leakage erosion of water supply pipelines mainly goes through three stages,namely initial fluidization,stable erosion,and erosion failure.The stable erosion stage lasts the longest,and the cavity tends to stabilize during this stage.With the increase of sand erosion rate and pipeline leakage orifice width,the disturbance area of the soil and the scale of the cavity also increase.When the pipeline leak-age orifice width reaches a certain value,the leakage tends to stabilize at a high level,and the cavity and dis-turbance area stabilize at a certain scale.The research results can provide technical support for the evaluation and prevention of road collapses induced by pipeline leakage.
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维普
