Gas Injection Deformation Law of Soil Layer Based on Water-gas Two-phase Fluid-solid Coupling
In order to deal with the risk of water inrush accident in the construction process of subway connecting passage,this paper puts forward the construction technology of air pressure water insulation based on the investigation of air pressure caisson method and air pressure NATM.Based on Biot consolidation theory,van Genuchten model,Darcy's law and continuity theorem,a theoretical model of stress field,seepage field and phase field coupling is established,a van Genuchten model parameter and Biot consolidation coefficient inversion method are established,the above parameters of the test silt sample are successfully restored by the seepage data of the air pressure water-proof feasibility test.The law of air diffusion surface and surface subsidence after gas injection in silt layer is studied by numerical simulation.The research shows that,the air diffusion area increases linearly with the increase of gas injection pressure,and the surface uplift tends to be gentle after the gas injection pressure exceeds 1.7 times of the hydrostatic pressure.Under the condition of silt layer,taking the cross-sectional area of 16m2as an example,the buried depth increases from 10m to 50m,and the surface uplift after gas injection increases linearly from 6mm to 42mm.
万方数据
维普
