Influence of leakage erosion of hydraulic pipelines on tunnel settlement
In order to study the influence of pipeline leakage erosion on tunnel settlenment,based on the principle of fluid-structure coupling,PFC2D is used to simulate the pipeline and tunnel.The measuring circle in PFC is used to monitor the changes of soil permeability and porosity under different particle skeletons and the pore water pressure distribution in the soil around the tunnel.From this,the location of the stress concentration is inferred.The tunnel settlement simulation is completed.The results show that under the action of pipeline leakage and erosion,the buoyancy of the water in the tunnel,the pressure of the surrounding soil,and the thrust of the water flow can be regarded as a shear resultant force,which is easy to damage the external structure of the tunnel.When the soil particle gradation is the same and the pressure gradient of the fluid is different,the settlement amount of the tunnel is positively correlated with the pressure gradient.The model similarity ratio and stress similarity ratio in the test can effectively reduce the error caused by the boundary effect of the indoor test.
fluid-structure couplingpipeline leakagetunnelsedimentationpressure gradientsimilarity ratio
NETL
NSTL
万方数据
