| Groundwater seepage has an impact on the deformation laws of foundation supporting structure in the process of subway station foundation pit excavation and precipitation. Especially when the pit is near the river,the river water may connect with undergroundwater,the coupling of seepage and stress may has a greater impact to the deformation of foundation supporting structure.Relying on the deep excavation of the subway station of Dadongmen in Hefei,the project data is researched comprehensively.The overall three-dimensional numerical model for the 1st line is established using MIDAS/GTS finite element software,and the results are consistent with the results of field monitoring.A three-dimensional model in the 1st line is cut based on the above.and by studying the case of two different water conditions of Nanfeihe,the impact on deformation laws of foundation supporting structure caused by groundwater seepage is explored.The results show that impact on deformation laws of foundation supporting structure caused by groundwater seepage can not be ignored, at the same time, When river level changes significantly, the impact of underground seepage caused by the connectivity of groundwater seepage and groundwater is also significant.Through analysis of construction features of subway station of Dadongmen, the three levels risk evaluation index system was established.The index weight of each layer was determined by a modified FAHP.The risks of subway station of Dadongmen were ranked by using a nonlinear fuzzy comprehensive evaluation model,and the results show that risks associated with underground and underground seepage have relatively high level of risk indicators. Study show that full consideration of impact on deformation laws of foundation supporting structure caused by groundwater seepage has important engineering significance,and the simulation results also provide some reference value for the foundation pit excavation. |
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