Abstract：Research purposes: The duct piece for shield tunnel lining is an eccentric pressed component with failure modes of the pressures on the big and small eccentric centers of the head—on cross—section and the shearing force on the oblique section．The functions expressed by moment of flexion or axial force for the bearing capacity of head—on Cross—section under typical condition were given in the previous study，but they can not fully attribute the working mode of the duct piece．This paper offers many expressions for the functions used for the bearing capacity of the pressures on the eccentric center of the head—on Cross—section and the shearing resistance of the oblique section based on the analytic formulas for the beating capacity and inner force of the duct piece for the shield tunnel lining in order to provide the reliability for calculating the bearing capacity of the cross—section，and evaluates the sensitive factors of the functions for the bearing capacity of the Cross—section of the duct piece．
Research conclusions: With establishing the functions for the bearing capacities of the head—on Cross—section and oblique section of the shield tunnel lining，the analytic formulas for the bearing capacity of head—on Cross—section with big and small eccentric center and shearing resistance of oblique section are offered．The sensitive analyses of the random variations of the functions for bearing capacity are made with an example．It is concluded for the bearing capacity of the head—on cross—section，the sensitivity of random variations is different when using the functions with different expressions，the Pv has the biggest influences on the functions for the bearing capacity of head—on Cross—section oil the arch top，and the f,has the biggest influence on the functions for bearing capacity of the oblique section on the arch web．
2009, Vol. 26 
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