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  A Case Study for Large Excavation Constructed by Open Cutting with Under Mining Method in Xuzhou, China

  Compared with the simple excavation, the mechanical characteristics and ground deformations of the excavation constructed by Open Cutting with Under Mining (OCUM) Method are more challenging to predict. Peng-cheng Square Station is the transfer station of Metro Line 1 and Line 2 in Xuzhou, China, which was composed of a 23m-depth L-shaped open cutting foundation pit and 8 tunnels with 248m-total-length to meet the high utilization demands and the limited boundary conditions. This study takes this project as a case study introducing the main planning scheme, the risks and the critical points of construction methods. Based on the measured data from the site, the deformation of supporting system and the ground surface was analyzed for the whole process. Lastly, the lessons learned from this project were summarized to provide reference for similar cases.

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