Reserve strength and rehabilitation of deteriorated pipe infrastructure

在过去的二十年中，已经开发了许多新的下水道，水管和涵洞修复方法，并且每年都会出现更多的程序，为加拿大每年20亿美元的管道基础设施再投资提供服务，全球每年高达1000亿美元。然而，在退化管道的储备（即剩余）强度、修复后与许多不同衬管系统的相互作用、控制强度和使用极限状态以及设计方法开发的适当近似方面，存在重要的知识空白。利用世界领先的地埋管测试设施和土-管相互作用的新解决方案，赠款将支持开创性的贡献观察，解释，量化和概念上简化这些复杂的“土中壳中壳”系统。为期5年的补充项目将：a.改变目前估计退化金属和混凝土涵洞剩余容量的方法，并提出第一个综合的荷载等级方法（设定允许车辆重量），考虑到管道、土壤和上面的路面的损坏，并允许使用卡车荷载下的响应现场测量。b.实现首个演示系统，在该系统中，重要涵洞的推力和力矩分布可以从工作台上进行监测。c.制定关于涵洞修复的行为和设计（包括强度限制）的明确指导，使用就地固化衬垫、喷射水泥衬垫、注浆滑垫和铺砌倒置，将之前的工作与新发现结合起来，以解决与涵洞形状、循环载荷和注浆选择相关的剩余知识空白。d.澄清用于修复铸铁水管的两种最常见的压力管道衬垫（普通环氧树脂和玻璃纤维）的强度极限控制性能如何受到弯道处褶皱和间隙以及衬垫-管道粘附和/或摩擦等因素的影响。这项工作将引入新的分析方法，全尺寸物理建模和设计模型，并将定义或影响加拿大和国际奖学金和设计实践这些问题。18名HQP（6名硕士，7名博士和5名本科生）。受过培训的学生将解决这些主题专家的大量需求，被招聘为市政，结构和岩土专业人员。

Many new methods of sewer, water pipe and culvert repair have been developed over the past two decades, and further procedures appear each year, servicing ongoing pipe infrastructure reinvestments of $2B/yr across Canada and up to $100B each year internationally. However, there are important knowledge gaps regarding the reserve (i.e. remaining) strength of deteriorated pipes, the interactions that result after repair with any of the many different liner systems, the controlling strength and service limit states, and appropriate approximations for development of design methods. Using the world's leading buried pipe test facility & new solutions for soil-pipe interaction, the Grant will support seminal contributions observing, explaining, quantifying and conceptually simplifying these complex `shell in shell in soil' systems. Complementary projects over 5 years will: a. Transform current methods of estimating remaining capacity of deteriorated metal and concrete culverts, and produce the first comprehensive methods for their load rating (setting allowable vehicle weights), considering damage to the pipe, the soil, and the pavement above, and permitting use of field measurements of response under truck loads. b. Realise the first demonstration systems where thrust & moment distributions for important culverts in the field are monitored from the desk-top c. Develop clear guidance on the behaviour and design (including strength limits) for culverts rehabilitated using cured in place liners, sprayed cementitious liners, grouted slipliners, and paved inverts, integrating previous work with new findings to address remaining knowledge gaps associated with culvert shape, cyclic loading, and grout choice. d. Clarify how the strength limits controlling performance of the two commonest kinds of pressure pipe liner (plain epoxy and fibreglass) used to repair cast iron water pipes are influenced by factors such as wrinkles & gaps at bends, and the liner-pipe adhesion and/or friction). The work will introduce new methods of analysis, full scale physical modeling, and design models, and will define or influence Canadian & international scholarship and design practices for these problems. The 18 HQP (6 MASc, 7 PhD and 5 Undergrad. students) trained will address the substantial demand for experts in these topics, to be recruited as municipal, structural and geotechnical professionals.