中文摘要：

采用有限元方法,模拟计算了混凝土管片在土压力作用下的内力分布特性。数值计算结果表明,在土压力作用下,隧道管片的最大正负弯矩绝对值相等;管片轴力均为受压状态;管片剪力近似为反对称分布,最大正负剪力绝对值基本相等。基于数值模拟的管片内力分布特性和混凝土结构设计规范,将混凝土管片简化为大偏心轴向受压柱,建立了混凝土管片极限弯矩与轴力之间的映射关系。在给定管片布筋和混凝土强度等级的条件下,提出了完整混凝土管片极限弯矩计算模型,研究了轴力对管片及其接头极限弯矩的影响。结果表明,完整混凝土管片的极限弯矩随着管片轴力的增加而减小,管片接头的极限弯矩基本与轴力无关,混凝土管片接头的极限正弯矩约为完整管片极限弯矩的40%。

英文摘要：

A finite element method was applied to simulate and calculate the internal force distribution features of the concrete segments under the earth pressure role.The numerical calculation results showed that under the earth pressure role,the max positive and negative bending moment absolute value of the tunnel concrete segments were equal.The axial force of the segments were in a pressurized state.The shearing force of the segments was approximately in an antisymmetry distribution and the max positive and negative shearing absolute values were equal basically.Based on the numerical simulated internal force distribution features of the segments and the design specifications of the concrete structures,the concrete segments could be simplified as a large eccentric axial compression column and the mapping relationship between the ultimate bending moment and the axial force of the concrete segments was established.Under the conditions of the given reinforced bars and concrete strength grade of the segments,a ultimate bending moment calculation model of the completed concrete segments was provided and the paper had a study on the axial force affected to the ultimate bending moments of thesegments and joints.The results showed that the ultimate bending moment of the completed concrete segment would be reduced with the axial force of the concrete segment increased and the ultimate bending moment of the segment joints would not be related to the axial force basically.The ultimate positive bending moment of the segment joints was 40% of the ultimate bending moment of the completed segment.