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

在土木工程土方工程中，诸如挡土墙等的地基改良技术正在迅速发展。仅举一个例子，用先进的聚合物土壤加固板和钢产品的水平层建造的挡土墙已被证明可以将传统墙解决方案的成本降低高达50%，并提供与旧技术竞争的更可持续的解决方案。在北美术语中，这些系统被称为机械稳定土墙（MSE）。目前，** 加拿大岩土工程界正在从分析和设计方法（根据安全系数描述 ** 安全裕度）转向根据失效概率描述安全裕度 **，其中包括荷载和阻力系数设计（LRFD）。后者是一种更严格的方法，使 **MSE墙设计与结构工程实践保持一致。MSE墙类别包括由混凝土面层和回填土组成的系统，该系统由镀锌钢格栅层加固。这是一项由加拿大大西洋工业有限公司（AIL）提供的技术。这些系统抗拉伸断裂和加筋土回填中钢格栅拔出的稳定性的当前模型 ** 已经有20年的历史了，其准确性使用最近在现场收集的测量数据库 ** 尚未得到充分检查。此外，加拿大和美国使用的LRFD规范对相同的钢格栅类型产生不同的设计 ** 结果，这可能会使一些钢土加固供应商（例如AIL）处于 ** 劣势。再加上这一挑战是缺乏一个严格和准确的方法，将 ** 潜在的钢筋腐蚀纳入钢网格MSE墙的可靠性寿命预测。钢筋锈蚀对MSE钢墙体寿命性能的影响是设计人员经常提出的问题。这项与AIL合作研究计划的 ** 结果将为AIL提供基于性能可靠性的现代分析和设计工具，包括最小锌（电镀）涂层的建议。这将有助于AIL在加拿大、美国和国际上推广其钢格栅MSE墙技术的使用。

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.