FLUID-SOLID COUPLING ANALYSIS DURING THE CONSTRUCTION OF SUBWAY TUNNEL

摘要

Subway tunnel construction inevitably gives rise to ground settlements. As for shallow-buried and high ground water table tunnel, the coupling of hydrological and stress field must be paid more attention. By seepage continuity equation and hydrodynamic equations, deduce fluid-solid coupling equation considering various factors effecting permeability coefficient. Analyze the BIOT seepage consolidation equation and discuss the Physical meaning of fluid-solid coupling. Put forward the fluid-solid coupling equation considering all kinds of influence index on consolidation. Use finite element method in view of elastoplasticity fluidsolid coupling theory to set up two dimension finite element model. Study changing situation of the deformation and stress by contrast the effect of seepage. And, contrast the measured value and simulation value to verify the rationality of using fluid-solid coupling method to forecast the ground settlement during tunnel construction. This method can reflect the process of the consolidation settlement and has significance on estimating and forecasting underground settlement.