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

在许多岩土工程问题中，土体都会发生大变形。例如，在加拿大东部和斯堪的纳维亚半岛的敏感粘土中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数百米以上。同样，在某些情况下，在近海环境中，碎片可能会移动数百米到数百公里。这些山体滑坡可能会影响人口和破坏位于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被用来预测滑坡和跑动的程度。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力学框架中模拟滑坡和泥石流的大变形。将调查管道与土壤的相互作用，包括运营过程中土壤的大变形，以及滑坡和跳动影响管道的情况。将研究不同条件下桩的安装和承载能力的影响，包括敏感粘土中的桩和倾斜地基中的桩。纽芬兰和拉布拉多纪念大学的五名硕士和五名博士生的研究将得到这笔赠款的支持，他们将接受关于在陆上和近海环境中具有挑战性的岩土问题的高级实验室测试、数值分析和物理模型方面的培训。研究结果将有助于滑坡危险评估和改进管道和桩的设计指南的制定。

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.