Simulation of soil stress in bridge piles of subway stations under high soil resistivity
In high soil resistivity environments,the power supply system of electrified subways had to consider the impact of soil resistance on energy transmission.Facing the current soil stress analysis methods that neglected the correlation effect of high soil resistivity,which led to the inconsistency between soil stress simulation and actual situation,a soil stress simulation method for subway station bridge piles under high soil resistivity was proposed.The vdP method was used to analyze the electrical resistivity in high soil,and the FLAC finite element method was employed to construct a finite element model based on the analysis results.Starting from engineering practice,a differential equation composed of soil was established using the finite element method,which was expressed in two forms:displacement and pore pressure.The unit flow rate in the x,y,and z directions of the soil was determined by Darcy's law.The relationship between the soil deformation per unit time and the surface flow rate of the unit under the evolution of soil continuity characteristics of bridge piles in the open excavation project of subway stations was analyzed.According to the fluid structure coupling calculation formula,the open excavation process of subway stations was designed.Based on the numerical simulation process of soil stress based on the finite element model,the main stress simulation results during the initial stage of open excavation and after a period of open excavation were analyzed.From the comparison results of examples,it was seen that there was only an error of 0.5 m between the land subsidence amount of this method and the actual measurement value,and the horizontal displacement was consistent with the actual displacement value.
high soil resistivityopen excavation of railway stationbridge pile soilstabilitynumerical simulation
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