In recent years,TBM has been widely used in the construction of long-distance water conveyance tunnels.The quadrilateral segment has the advantages of a simple shape,easy installation of water stops to meet sealing requirements,uniform force distribution of pipe segment,and convenient construction.A foreign long diversion tunnel project,which features an internal diameter of 6.8m,uses a quadrilateral segments with a thickness of 0.25m and a ring width of 1.6m.In order to analyze the stress situation of the segment,ANSYS software was used to establish a three-dimensional finite element model.The stress-strain characteristics of the segment under various working conditions were analyzed by using the european standards to determine their compliance with the requirements of the standards.These can provide a basis for subsequent lining structure reinforcement and project safety construction.
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