盾构衬砌单环破坏历程的增量法解析解

Incremental analytical solution for failure history of a single ring of segmented tunnel lining

作为盾构整环管片破坏研究的一部分,采用增量法对单环在荷载作用下逐渐破坏的历程进行了解析解推导,提出了可考虑管片接头非线性转动的单环受荷历程的相对刚度比法和弯矩搜索法两种解析方法,并对已经通过盾构整环原型破坏试验数据详细校核的数值模型进行适当修正,构造出了对解析解进行检验的数值模型,通过对解析解和数值解的比较表明,相对刚度比法、弯矩搜索法两种增量解析方法可以较为准确的刻画出单环衬砌的受荷破坏历程,是可行的。

As one important and fundamental research part in exploring the failure history of segmented tunnel lining, the analytical solution in incremental mode for the single segment ring is developed to trace and understand the behavior of the segment ring especially at failure. The relative stiffness method(RSM) and bending-moment search method(BSM) are proposed and utilized to scan and snap the ultimate bending moment capacities and real-time safeties of the segment and segment joint in the whole linear and nonlinear loading histories of a single segment ring. The finite element model based on one full-scale-test is revised by neglecting the interaction between the rings and the reinforcements in the segment in order to provide one benchmark test for the analytical solutions of RSM and BSM. The bending moments in the segment and segment joint of the analytical solutions are compared to FE calculations based on the same validation model, and a very good agreement is found. It is concluded that the proposed incremental analytical methods(RSM and BSM) are applicable.