盾构隧道大修结构服役性能评价及跨尺度模拟

Service Performance Evaluation and Cross Scale Simulation of Shield Tunnel During Overhaul

摘要:

以延安东路越江隧道大修工程为背景，综合资料调研、现场检测以及成因分析、性能评估，提出了盾构隧道大修结构评估原则、流程与方法.基于环境、材料、构件及结构多层次评价指标体系，建立了盾构隧道大修结构区段整体性能评估方法及流程.重点针对结构收敛过大特殊区段，综合随机格构理论及Diana分析软件，提出了以材料管片隧道结构为主体的跨尺度模拟方法.分析了盾构隧道在不同收敛变形条件下衬砌结构开裂特征及变化规律，并提出了盾构隧道收敛变形指标.

关键词:盾构隧道; 大修; 跨尺度; 开裂特征; 评价指标

Abstract:

By taking the Yan’an East Road Tunnel overhaul project as the background, the principles, procedures and methods of structural evaluation for the overhaul of shield tunnels were put forward based on data investigation, tunnel disease onsite detection and analysis, and performance evaluation requirements. A multilevel evaluation index system and process of environment, material, component and structure was established, and severed for the overall performance evaluation. Meanwhile, aiming at the special evaluation requirements of the sections with large convergence, by employing the comprehensive lattice theory and Diana finite element analysis method, a cross scale simulation method of material, component and tunnel structure was put forward. The cracking characteristics of shield tunnel lining structure and the changing law under different convergent deformation conditions were analyzed, and the convergence deformation of shield tunnel was established.

Key words:shield tunnel; overhaul; cross scale; cracking properties; evaluation index