双连拱隧道施工中衬砌开裂与力学行为研究进展

双连拱隧道因其较高的空间利用率而在工程中被广泛应用,然而在后行洞施工过程中先行洞衬砌常发生开裂。为研究此过程中衬砌的开裂及力学行为,该文提出了将分布式光纤监测、反演分析方法及可反映混凝土开裂行为的有限元模拟相结合的研究方法,在广泛调研国内外文献的基础上,梳理总结了该课题组研究相关成果,包括：依托于实际工程,实现了分布式光纤监测在连拱隧道施工中的应用;提出了精度更高的衬砌结构力学行为反演分析方法;验证了利用总应变旋转裂缝本构模型反映复杂受力及约束下的钢筋混凝土构件力学性能和开裂模式的可行性。该文的研究方法与结论可为有关工程实践提供参考。

RESEARCH PROGRESS ON CRACKING AND MECHANICAL BEHAVIOR OF LINING DURING DOUBLE-ARCH TUNNEL CONSTRUCTION

Double-arch tunnels are widely used in engineering because of the high space usage. Cracking is frequently observed in the first tunnel lining during construction of the second tunnel. To study the cracking and mechanical behavior of the lining in this process, an analysis method including distributed optical-fibre monitoring, inversion analysis method and finite element simulation that can reflect concrete cracking is proposed in this paper. Domestic and foreign literatures are extensively investigated, and the relevant research results of the authors are summarized, including: based on the actual engineering case, the application of distributed optical-fibre monitoring in the double-arch tunnel construction is realized. A more accurate inversion analysis method of mechanical behavior of tunnel linings is proposed. The feasibility of using the total strain rotating crack constitutive model to reflect the mechanical properties and cracking modes of reinforced concrete components subjected to complex stress and confinement is verified. The research methods and conclusions in the paper can provide a reference for related engineering practice.