Behaviour and design of cured in place liners in noncircular corrugated steel culverts

在加拿大各地，数以万计的旧波纹钢涵洞和下水道需要修复或更换。就地固化管道(CIPP)衬里现在是混凝土和粘土风暴和卫生下水道的公认修复选项。然而，对于安装在波纹钢制下水道和涵洞内的CIPP衬垫还没有既定的设计方法：ASTM F1216中用于刚性下水道内的CIPP衬垫的程序不适用，因为它们A只适用于圆形或几乎圆形的结构，B.忽略车辆荷载。该项目包括四个阶段：文献综述、研究衬垫对车辆载荷的响应的全尺寸试验、研究衬垫对外部流体载荷的抗力的进一步测试以及设计程序的制定。第二期工程包括在皇后大学地球工程实验室埋设两条椭圆形波纹钢管。其中一条暗渠将采用传统的CIPP树脂浸渍毛毡衬里，另一条暗渠将使用纤维增强的紫外光固化衬里。在维修前后，将进行模拟车辆载荷下的性能测试。测量将确定衬砌和旧钢结构中推力和力矩是如何发展的，以及衬砌-钢涵洞-土壤相互作用的性质。每个衬砌涵洞的最终试验将增加表面荷载，直到完全动员强度，以确定破坏机理。这将是有史以来第一次进行此类测试。在第三阶段，另外两个相同类型的CIPP衬砌将在外部流体压力下进行测试，以首次测量这些类型钢涵内衬砌的屈曲强度。项目的最后阶段将涉及使用有限元分析来解释测试观察结果，并开发设计方法，用于选择合适的衬砌厚度和聚合物性能。两名博士生将接受培训，研究伙伴(专业修复承包商)将积极参与，他们随后将使用设计方法在加拿大各地的涵洞项目中使用。

Across Canada, tens of thousands of old corrugated steel culverts and sewers require rehabilitation or replacement. Cured in place pipe (CIPP) liners are now well established rehabilitation options for concrete and clay storm and sanitary sewers. However, there is no established design method for CIPP liners installed within corrugated steel sewers and culverts: the procedures in ASTM F1216 used for CIPP liners within rigid sewers are not suitable, because they a. are only for circular or almost circular structures, b. neglect vehicle loads. This project involves four phases: a literature review, full scale testing to investigate liner response to vehicle loads, further testing to study liner resistance to external fluid loads, and development of design procedures. The second phase involves burying two corrugated steel pipes with elliptical geometry in the GeoEngineering Laboratory at Queen's. One culvert will be lined using a conventional CIPP resin-impregnated felt liner, and the other using fibre-reinforced, UV cured liner. Performance testing under simulated vehicle loads will be conducted before and after repair. Measurements will establish how thrust and moment develop in the liners and the old steel structure, and the nature of the liner-steel culvert- soil interactions. Final tests on each lined culvert will increase surface load until strength is fully mobilized, to establish the failure mechanisms. These will be the first tests of their kind ever performed.During the third stage, two further samples of the same CIPP liner types will be tested under external fluid pressure to measure, for the first time, buckling strength of liners within these kinds of steel culverts.The final stage of the project will involve use of finite element analyses to interpret the test observations, and to develop design methods for use in selecting suitable liner thicknesses and polymer properties. Two PhD students will be trained and there will be active participation of the research partner (a specialist rehabilitation contractor) who will subsequently use the design methods for culvert projects across Canada.