Study On The Risk Prediction Of The Supporting Structure Of A Continuous Wall Foundation In A Subway Station Based On BIM

There exist many problems in the process of the construction of the foundation pit in a subway station,such as complex geological conditions,diversities of the surrounding environment and the low level of information,which will make risk identification and risk forecasting more difficult.In the present study,the structure of a continuous wall foundation in a subway station was simulated by BIM technology through the software of Autodesk Revit and the corresponding horizontal and vertical displacements of this continuous wall foundation were analyzed through the software of ABAQUS.Finally,the risk prediction of the excavation process was carried out.(1)With the software of Autodesk Revit,the BIM model of the subway station was established,according to preliminary modeling,node construction,refinement program complete model,which combined with the geological condition and supporting structure form of a subway station foundation project,contained the information required for the project.(2)Based on the above BIM model,the corresponding numerical simulation model was established by the ABAQUS and the displacement of this continuous wall in the excavation process was analyzed.The calculation results show that both the horizontal and vertical displacement at the standard section of the continuous wall increase with the excavation depth,and the curve is close to a parabola.At the same time,the horizontal displacement and vertical displacement of the end wall of the continuous wall also increase with the depth of the foundation pit.On this basis,the position distribution of the maximum displacement of this continuous wall can be captured,which will provide a basis for the risk prediction.(3)Based on the concept of the risk characteristics and risk early warning in the engineering of foundation pit in the subway station,horizontal and vertical displacements of this continuous wall were predicted through using Elman network prediction model and numerical simulation results.Meanwhile,the risk index value of this continuous wall during the excavation of the foundation pit is obtained,relying on the risk level and the fitting method of the project risk index.Finally,the risk level of the construction process is predicted,which can provide technical guarantee for the safety of the foundation pit construction of the subway station.