Improving the Resilience and Sustainability of Buried Infrastructure

许多现有的基础设施正在接近或已经超过其预期的使用寿命。随着基础设施的不断老化，问题会恶化，故障风险也会增加。此外，由于全球天气和气候的变化，预计加拿大和世界各地的整体气温将会上升。因此，确定气候变化将在多大程度上影响埋藏结构的性能和相应的设计至关重要。因此，拟议的研究是跨学科的，侧重于弹性基础设施的各个领域，包括气候变化的影响，以利用回收的废旧材料制定可持续的基础设施解决方案。拟议的研究计划包括处理各种分析和设计问题的六项任务。第一项任务是全面评估新桩基对现有隧道的潜在不利影响，并考虑到实际的土壤条件和隧道衬砌的现状。根据研究结果，将建立一个现实的隔离区和/或制定预防措施，以允许附近的桩基。此外，还将在第二、三、四项任务中进行全面研究，量化和优化钢质涵洞的修复方法。研究将考虑气候变化对中大跨度涵洞退化进程的影响。根据这项研究的结果，加拿大市政当局可以更好地管理其老化的涵洞。轻质可压缩材料的使用可以降低埋在地下结构上的应力。因此，在第五个任务中，将研究轮胎衍生集料(TDA)在改善埋地涵洞性能方面的创新应用。最后一项研究任务是探索整体式桥台后TDA的新应用。在循环热荷载作用下，结构在较冷的温度下收缩，在较热的温度下膨胀，在土体回填体内产生主动和被动土压力，从而在结构基础桩中产生应力。气候预测模型预测，加拿大和世界各地的整体气温将会上升。因此，有必要确定气候变化将在多大程度上影响IABS的性能并进行相应的设计。作为一种轻质材料，TDA可以减少对基牙的压力，并导致经济的设计。此外，较大的TDA弹性范围可以通过减少棘轮的量来提高IABS的长期性能。拟议的方法将有助于评估与埋在地下的基础设施相关的危险，目的是减少主要交通干道发生灾难性故障的可能性，从而提高加拿大人的安全性，降低城市地区的开发成本。

Much of the existing infrastructure is approaching or has already exceeded its intended service life. As infrastructure continues to age, problems worsen, and the risk of failure increases. In addition, due to global changes in weather and climate, it is anticipated that overall temperatures will rise in Canada and worldwide. Therefore, it is essential to determine the extent to which climate change will affect the performance of buried structures and design accordingly. Hence, the proposed research is interdisciplinary and focuses on various fields of resilient infrastructure, including the effects of climate change, to develop sustainable infrastructure solutions using recycled waste materials. The proposed research program includes six tasks that deal with various analysis and design issues. The first task constitutes a comprehensive assessment of the potential adverse impact of new piled foundations on existing tunnels, considering actual soil conditions and the current condition of the tunnel lining. Based on the research results, a realistic exclusion zone will be established and/or precautionary measures will be developed to allow close-by piled foundations. In addition, a comprehensive study in the second, third and fourth tasks quantifying and optimizing rehabilitation methods for steel culverts will be performed. The study will consider the climate change effects on the degradation progress of culverts with medium to large spans. Based on the results of this study, Canadian municipalities can better manage their aged culverts. The use of lightweight compressible materials can reduce the stresses on buried structures. Hence, in the fifth task, an innovative application of tire-derived aggregate (TDA) to improve the performance of buried culverts will be investigated. The last research task will explore a new application of TDA behind the abutments of integral abutment bridges (IABs). Under cyclic thermal loading, the structure contracts in cooler temperatures and expands in warmer temperatures, inducing active and passive earth pressures within the soil backfill and resulting in stresses in the structure foundation piles. Climate prediction models forecast that overall temperatures will rise in Canada and worldwide. Therefore, it is necessary to determine the extent to which climate change will affect the performance of IABs and design accordingly. As a lightweight material, TDA can reduce the pressures on the abutments and result in an economical design. In addition, the larger elastic range of TDA can enhance the long-term performance of IABs by reducing the amount of ratcheting. The proposed methodologies will help assess the hazards associated with buried infrastructure with the aim of reducing the potential for catastrophic failures in major transportation arteries, which translates into increased safety for Canadians and reduced cost for development in urban areas.