基于断裂力学的盾构隧道管片结构开裂破损机制探讨

doi:10.13722/j.cnki.jrme.2015.1003

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摘要管片结构的破损已经成为盾构隧道的常见病害之一。采用基于断裂力学的有限元方法，从单块管片、2块管片(含接头)、整环衬砌结构3个层次探讨盾构隧道管片结构的破损机制。研究表明，单块管片的承载力性能和破坏模式主要受边界约束条件的影响；接头的破坏表现为一侧张开、一侧压碎并最终导致整环衬砌结构的破坏。简化的连续型接头模型在模拟低负载条件下的接头行为时与真实情况较为接近，但无法模拟在高负载或承载力极限条件下接头两端管片相互脱离、断开的现象和接头区混凝土的压碎现象。为了更准确地预测整环衬砌结构的极限承载能力和变形性能，接头的模拟是关键。

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关键词 ：隧道工程, 管片结构, 破损机制, 有限元, 接头

Abstract：The breakage of segmented lining has become one of the common problems of shield tunnels. The breakage mechanism of segmented lining in shield tunnels was discussed using the finite element method based on fracture mechanics from three levels，i.e.，a single segment，two segments with a joint and the whole lining ring. The bearing capacity and the failure mode of a single segment were found to be mainly affected by the boundary conditions. The failure of joints was in the form of opening at one side and crushing at the other side and eventually leading to the destruction of whole lining ring. The continuous joint model was found to be close to the real situation in modeling the mechanic behavior at a low load condition. The disconnection of two segments at the joint at a high load，and even the ultimate bearing capacity condition were not able be to be captured in the simulation，neither the concrete crushing around the joint. Therefore，the modeling of joint is the key in order to more accurately predict the bearing capacity and deformation of a whole lining ring.

Key words： tunnelling engineering segmented lining breakage mechanism finite element；joints

引用本文:

杨雨冰1，2，谢雄耀1，2. 基于断裂力学的盾构隧道管片结构开裂破损机制探讨[J]. 岩石力学与工程学报, 2015, 34(10): 2114-2124.
YANG Yubing1，2，XIE Xiongyao1，2. BREAKING MECHANISM OF SEGMENTED LINING IN SHIELD TUNNEL BASED ON FRACTURE MECHANICS. , 2015, 34(10): 2114-2124.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2015.1003 或 http://www.rockmech.org/CN/Y2015/V34/I10/2114

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