Design and analysis tools for steel grid mechanically stabilized earth walls considering corrosion

考虑腐蚀的钢格栅机械稳定土墙的设计和分析工具

• 批准号: 532046-2018
• 负责人: Bathurst, Richard
• 金额: $ 1.82万
• 依托单位: Royal Military College of Canada
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=644791
• 关键词: Design; analysis; tools; steel; grid

Technologies to improve the ground in civil engineering earthworks such as retaining walls are advancing**rapidly. As just one example, retaining walls constructed with horizontal layers of advanced polymeric soil**reinforcement sheets and steel products have been demonstrated to reduce the cost of conventional wall**solutions by up to 50% and provide more sustainable solutions in competition with older technologies. In North**American terminology these systems are called mechanically stabilized earth (MSE) walls. Currently the**Canadian geotechnical engineering community is migrating from methods of analysis and design that describe**margins of safety in terms of factors of safety to margins of safety described in terms of probabilities of failure**which include load and resistance factor design (LRFD). The latter is a more rigorous approach and brings**MSE wall design into alignment with structural engineering practice. Included in the MSE wall category are**systems composed of a concrete facing and backfill soil that is reinforced by layers of galvanized steel grids.**This is a technology provided coast to coast by Atlantic Industries Limited (AIL) in Canada. Current models**for stability of these systems against tensile rupture and pullout of steel grids in the reinforced soil backfill are**now two decades old and their accuracy using a database of recently collected measurements in the field has**not been fully examined. Furthermore, LRFD codes used in Canada and the USA produce different design**outcomes for the same steel grid type which can put some suppliers of steel soil reinforcement such as AIL at a**disadvantage. Coupled with this challenge is the lack of a rigorous and accurate approach to incorporate**potential corrosion of the steel reinforcement into lifetime predictions of the reliability of steel grid MSE walls.**The influence of steel corrosion on lifetime performance of MSE steel walls is often raised by designers. The**results of this collaborative research program with AIL will provide modern performance reliability-based**analysis and design tools for AIL including recommendations for minimum zinc (galvanic) coating. These will**assist AIL to promote the use of their steel grid MSE wall technology in Canada, the USA and internationally.

土木工程土方工程（例如挡土墙）的地面改善技术正在迅速发展**。仅举一个例子，事实证明，采用水平层先进聚合物土壤**加固板和钢材建造的挡土墙可将传统挡土墙**解决方案的成本降低高达 50%，并在与旧技术的竞争中提供更可持续的解决方案。在北美术语中，这些系统称为机械稳定土（MSE）墙。目前，**加拿大岩土工程界正在从以安全系数描述**安全裕度的分析和设计方法转向以失效概率**描述安全裕度的分析和设计方法，其中包括载荷和阻力系数设计（ LRFD）。后者是一种更严格的方法，使**MSE 墙体设计与结构工程实践保持一致。 MSE 墙类别中包括**由混凝土饰面和回填土壤组成的系统，并由多层镀锌钢网格加固。**这是加拿大大西洋工业有限公司 (AIL) 向全国各地提供的技术。当前的模型**用于这些系统在加筋土壤回填中抵抗拉伸断裂和钢网拉拔的稳定性**已有二十年历史，并且使用最近收集的现场测量数据库的准确性尚未得到充分检验。此外，加拿大和美国使用的 LRFD 规范对于相同的钢格栅类型产生不同的设计**结果，这可能使 AIL 等钢土加固供应商处于不利地位。伴随这一挑战的是，缺乏严格而准确的方法来将**钢筋的潜在腐蚀纳入钢网格 MSE 墙可靠性的寿命预测中。**钢材腐蚀对 MSE 钢墙寿命性能的影响是经常被设计师提出。与 AIL 合作研究项目的**结果将为 AIL 提供基于性能可靠性的**分析和设计工具，包括最小锌（电镀）涂层的建议。这些将帮助 AIL 在加拿大、美国和国际上推广其钢网格 MSE 墙技术的使用。