Study On Mechanics Effect Of Tunnelling Construction In Chaoyang District Based On Fluid-Solid Interaction Effect

With the development of underground construction,the tunnel will inevitably pass through some water-rich areas.Thanks to it,partial drainage methods is used to reduce the impact of groundwater on the tunnel.The impact of groundwater for underground construction can not be ignored.Therefore,it is very important to study the fluid-solid Interaction effect(FSI)in tunnelling.This paper try to study the mechanics effect of tunneling construction in Chaoyang District,Beijing.The main research contents are as follows:(1)A brief description of the seepage theory of saturated soils and the differential equations of the three-dimensional Fluid-Solid Coupling are deduced based on the seepage continuity equation and Biot's consolidation theory.(2)Collecting the date of surface subsidence and select the suitable section for calculation and analysis.(3)The fluid-solid coupling module is used to simulate the construction process of two tunnels.In order to study the influence of groundwater on tunnel excavation,numerical models are established either considering the fluid-solid interaction effect or not.The displacement field,stress field and seepage field in CRD and PBA construction methods are calculated.(4)According to the comparison of the simulation results and monitoring dates,the rationality and correctness of the numerical simulation are verified and the safety of the tunnel construction is evaluated.(5)Based on the research experience,the study of Chaoyang Park subway station in the same area is carried out to explore the effect of groundwater on the construction sequence of different guide holes under the condition of pile construction.