NUMERICAL SIMULATION OF GROUND SUBSIDENCE DUE TO TUNNEL EXCAVATION FOR WUHAN SUBWAY

It has been well known that tunnel excavation of subway in urban area can cause ground settlement. Excessive settlement would threaten safety of the tunnel itself and its surrounding buildings. Therefore, it will be of important practical significance to effectively predict and reasonably control this kind of subsidence. According to the excavation in Hu-Ming Section of Wuhan subway, the MIDAS/GTS software is used to build the model of the tunnel excavation. Surface subsidence caused by tunnel excavation is computed, and compared with the measured result. According to the situation of the corresponding ground and building during excavation process, the optimization of the preparative regimens on the surrounding rock excavation is carried out for building the optimization model of the tunnel excavation. The simulation results show the optimized surface subsidence is still in the safe range. The results would offer reference for similar projects in controlling the surface subsidence.