一类盾构管片接头破坏历程的解析解

为研究一类采用斜直螺栓、不设传力衬垫构造形式的盾构管片接头在高荷载水平下的破坏力学性态,在引入一定假设基础上,提出了可用于分析管片接头破坏历程的简化解析模型,并对简化模型在线性转动、接头张开、接头屈服等不同阶段的接头截面应力分布和转动情况进行了分析和推导。并通过弯矩-转角关系曲线和接头极限弯矩两个方面对本文简化力学模型的解析解与管片接头足尺试验结果进行了比较和验证,比较结果表明,该方法所得结果与试验结果基本一致,是可行的。

Analytical solution of segment joint model for segmented tunnel lining

To explore the nonlinear behavior and the crush history of the segment joint (without packing materials and with bolts) for the segmented tunnel lining under high load level, a simplified analysis model for the segment joint is introduced. The stress distribution and rotation angle of the joint are deduced at different stages of linear rotation, tension-induced opening and compression-induced yielding. In terms of the bending moment-rotation angle curve and the limit bending moment, the results of the analytic solution of the segment joint are verified through the full-scale tests. It is demonstrated that the nonlinear behaviors of segment joint are captured exactly by the model formula, and the analytical solution can be utilized to trace the initiation and development of opening and crush of the segment joint.