Large deformation behavior of soil in landslides and soil-structure interaction

在许多岩土工程问题中都会出现土体的大变形。例如，在加拿大东部和斯堪的纳维亚的敏感粘土中发生的大规模滑坡或海底滑坡中，土块的破坏可能会持续到坡顶后面几百米处。同样，在某些情况下，在近海环境中，碎片可能会行进数百米和数千米。这些山体滑坡可能影响人口，并损坏上坡和下坡方向的基础设施（如管道和桩）。经验和统计方法通常用于预测滑坡和径流的范围。拟议的研究计划将开发先进的数值技术，用于在基于欧拉的有限元和计算流体动力学框架中模拟滑坡和泥石流的大变形。将对管道-土壤相互作用进行调查，包括运行期间的大土壤变形，以及滑坡和跳动影响管道的情况。桩安装和承载能力的影响将在不同的条件下进行调查，包括桩在敏感粘土和倾斜的地面。五名硕士和五名博士候选人的研究将得到纽芬兰和拉布拉多纪念大学的资助，他们将接受先进的实验室测试，数值分析和陆上和海上环境中具有挑战性的岩土工程问题的物理建模方面的培训。其结果将有助于滑坡灾害评估和改进管道和桩的设计准则的发展。

Large soil deformation occurs in many geotechnical problems. For example, in large-scale landslides in sensitive clay in eastern Canada and Scandinavia or submarine landslides, the failure of soil blocks might continue over several hundred meters behind the crest of the slope. Similarly, the debris might travel hundreds of meters and kilometers in some cases in offshore environments. These landslides could affect the population and damage infrastructures (e.g. pipelines and piles) located both in upslope and downslope directions. Empirical and statistical approaches are typically used to predict the extent of landslides and runout. The proposed research program will develop advanced numerical techniques for modelling large deformation in landslides and debris flow in Eulerian-based finite element and computational fluid dynamics frameworks. Pipeline-soil interactions will be investigated, incorporating large soil deformation during operation, and including cases when the landslide and runout impact a pipeline. The effects of pile installation and load-carrying capacity will be investigated for varying conditions, including piles in sensitive clay and in sloping ground. Five Master's and five Doctoral candidates' research will be supported by this grant at Memorial University of Newfoundland and Labrador, who will receive training in advanced laboratory testing, numerical analysis and physical modelling of challenging geotechnical problems in onshore and offshore environments. The outcomes will be useful for landslide hazard assessment and the development of improved design guidelines for pipelines and piles.