Evaluation and design guidelines for damaged, degraded and new buried infrastructures

损坏、退化和新建地下基础设施的评估和设计指南***地下基础设施在支持加拿大经济和提高加拿大人的生活质量方面发挥着关键作用。加拿大的市政当局以及联邦、省和地区政府每年在基础设施开发、维修和维护方面总共花费250亿至280亿美元。这是加拿大的一项重大投资，需要改变基础设施的设计和管理方式，以提高效率和可持续性。提出的研究计划的主要重点是通过更好地了解其复杂的土壤-结构相互作用方面，为受损和退化以及新埋的基础设施制定有效的解决方案。提出的研究计划包括四个任务，处理各种分析和设计问题。第一项任务是综合评估新桩基础对现有隧道的潜在不利影响，同时考虑到实际的土壤条件以及隧道衬砌的现状。根据研究结果，可以建立一个现实的隔离区或制定预防措施，以允许安装近桩基础。此外，还将对钢涵洞的修复方法进行量化和优化的综合研究。基于这项研究的结果，加拿大市政当局可以更好地管理他们老化的涵洞。此外，将开发一种使用可持续轮胎衍生骨料（TDA）的创新涵洞基础设施。开发的系统将大大减少高路堤下正凸涵洞的应力。拟议的方法将有助于评估与地下基础设施有关的危险，目的是减少主要交通干线发生灾难性故障的可能性，从而提高加拿大人口的安全，降低城市地区的发展成本。研究结果对岩土工程顾问、市政工程师、交通部门和基础设施承包商具有极其重要的意义。**

Evaluation and Design Guidelines for Damaged, Degraded and New Buried Infrastructure ***Buried infrastructure plays a key role supporting the Canadian economy and improving the quality of life for Canadians. Canadian municipalities and the federal, provincial and territorial governments together spend $25 to $28 billion annually on infrastructure development, repairs and maintenance. This is a major Canadian investment that requires changes in how this infrastructure is designed and managed in order to become more efficient and sustainable. The primary focus of the proposed research program is to develop efficient solutions for damaged and degraded as well as new buried infrastructure through better understanding of their complex soil-structure interaction aspects. The proposed research program includes four 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 as well as the current condition of the tunnel lining. Based on the research results, a realistic exclusion zone may be established or precautionary measures developed to allow installation of close-by piled foundations. In addition, a comprehensive study quantifying and optimizing rehabilitation methods for steel culverts will be performed. Based on the results of this study, Canadian municipalities can better manage their aged culverts. Furthermore, an innovative new culvert infrastructure using sustainable Tire Derived Aggregates (TDA) will be developed. The developed system will substantially reduce the stresses in positive projection culverts under high embankments. The proposed methodologies will help assess the hazards associated with buried infrastructure with the aim of reducing potential for catastrophic failures in major transportation arteries, which translates into increased safety for Canadian populations and reduced cost for development in urban areas. The research results will be extremely important for geotechnical engineering consultants, municipal engineers, departments of transportation and infrastructure contractors. **