基于断层黏滑蠕滑效应的隧道结构累积损伤机理及防错断措施研究

With the development of national large-scale transportation infrastructure,a large number of tunnel projects under construction or construction will inevitably cross the active fault zone. The results show that the creep and stick-slip effects of active faults can lead to cumulative damage,Under severe conditions, the tunnel structure will be destroyed. In this project, we use theoretical analysis, numerical simulation and model test to study the accumulated damage mechanism and anti-breaking measures of tunnel based on active fault effect.Through the establishment of active fault tunnel lining interaction model, the paper study the cumulative damage effect of Two kinds of different activity patterns of creep and stick-slip, different fault widths and different fault dip angles to explore the cumulative damage of tunnel lining damage mechanism; Based on the cumulative damage characteristics of tunnel lining, the failure process of tunnel damage accumulation and fracture instability is studied, and the evaluation index system and fracture threshold of tunnel lining structure are obtained; Study on a new type of self anchored cable flexible structure of anti fault measures and its effect, optimization of key design parameters of anti fault measures, combined with the lining layer, hinged damping damping measures, the tunnel crossing active faults comprehensive anti-breaking measures. puts forward the comprehensive measures to break through the active fault. The research results have important theoretical and technical guidance significance for the design and construction of the tunnel across the active fault zone.

随着国家大型交通基础设施建设的不断推进，在建或拟建大量隧道工程将不可避免地穿越活动断层。活动断层蠕滑、黏滑活动效应对隧道结构会引发累积损伤，严重条件下甚至会破坏隧道结构。本项目采用理论分析、数值模拟和模型试验等综合手段，研究基于活动断层效应的隧道累积损伤破坏机理及防错断措施。通过建立活动断层-隧道衬砌相互作用模型，研究蠕滑、黏滑两种不同活动模式，不同断层宽度和不同断层倾角对隧道衬砌结构的累积损伤效应，探明隧道衬砌结构的累积损伤破坏机理；基于隧道衬砌累积损伤特性，研究隧道损伤累积直至断裂失稳的破坏过程，获得隧道衬砌结构错断评价的指标体系及断裂阈值；研究新型自锚钢索柔性结构等防错断措施及其效果，优化抗断措施的关键设计参数，结合衬砌铰接、减震层等减震措施，提出隧道穿越活动断层的综合抗断措施。研究成果对跨活动断裂带隧道工程的设计与施工具有重要的理论和技术指导意义。

随着现代化基础网络设施的逐步推进，大量的交通工程处于地质构造活跃及复杂的地区，且有着较高的隧线比，在建或拟建大量隧道工程将不可避免地穿越活动断层。活动断层蠕滑、黏滑活动效应对隧道结构会引发累积损伤，严重条件下甚至会破坏隧道结构。本项目采用理论分析、数值模拟和模型试验等综合手段，建立活动断层-隧道衬砌相互作用模型，研究了活动断层蠕黏滑效应诱发隧道衬砌累积损伤的机理、活动断层蠕黏滑效应下隧道衬砌错断失稳的力学特性、活动断层蠕黏滑效应下隧道衬砌防错断工程措施等内容，初步获得隧道穿活动断层带损伤特征及破坏阈值，不同断层宽度和不同断层倾角对隧道衬砌结构的累积损伤效应，探明了隧道衬砌结构的累积损伤破坏机理；研究了穿活动断层带隧道的防错断措施及其效果，结合衬砌铰接、减震层等减震措施，提出隧道穿越活动断层的综合抗断措施。研究成果对活动断裂带影响作用的隧道工程的设计与施工具有重要的理论和技术指导意义。