RESEARCH ON THE STABILITY OF UNDERCROSSED SUBWAY SHIELD TUNNEL

Based on the Guangzhou subway undercrossing structure, the structural deformation of the existing vehicular tunnel and the soil deformation were comprehensively analyzed, and an appropriate plan about the newly-built tunnel was proposed. The main contents of research are as follows:choosing the Guangzhou's 21th huangcun station-world grand station undercrossing the existing vehicular tunnel project used as a research object, a 3D finite element numerical model was established, and discrete element software was used for numerical calculation. The tunneling schemes for the new tunnel with different excavation stagger distance on the left and right lines were proposed, and its effect on the deformation of the tunnel undercrossing the existing vehicular tunnel was studied, so as to obtain an appropriate stagger distance range.