THREE-DIMENSIONAL COUPLING, NON-MINING FRACTURING PROCESS NUMERICAL SIMULATION FOR SHAFT IN THICK ALLUVIUM

When the fracturing of shaft lining happens, three simultaneous changes are involved among the bottom aquifer, the bed rock and the shaft lining, which are the seepage of groundwater in bottom aquifer from the bedrock to the shaft, the consolidation settlement resulted from the lost of groundwater in bottom aquifer and the development of additional force in the shaft lining, and the deformation of shaft lining subjected to the additional force. The fracturing process of shaft lining is numerically simulated by the Lagrangian Element Method, and the interface element is adopted to the coupling of the soil and the shaft lining. The result reveals the changing laws of different factors in the process of shaft-lining fracturing, and would play an impotant role in the fracturing mechanism analysis and prevention and harness for shaft lining.