New developments for geotechnical and hydraulic properties of soils

土壤岩土工程和水力特性的新进展

• 批准号: RGPIN-2018-05282
• 负责人: Chapuis, Robert
• 金额: $ 3.79万
• 依托单位: École Polytechnique de Montréal
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=713569
• 关键词: New; developments; geotechnical; hydraulic; properties

New developments for hydraulic properties of soils The general research goal is to improve basic research, testing methods and numerical analyses for groundwater. In the past 6 years, the applicant and his HQP have improved several methods used in groundwater engineering. Their research gave 54 papers in journal and 33 in proceedings, with 86 participations of HQP. The proposed research for the Discovery Grant will study three key basic topics, examine new ideas, propose new solutions, test them, and define new tools for numerical analyses. This research will contribute to the formation of 2 PhD, 4 MSc and 6 undergraduate students, all in groundwater engineering. Topic 1: real soils are too complex to be modelled with all physical details. They are not homogeneous but more or less stratified. There is an old equivalence for saturated hydraulic conductivity parallel to and normal to isotropic layers. However there are no equivalences for unsaturated properties, such as water retention and unsaturated hydraulic conductivity. Thus, there are needs to develop all equivalences between a stratified medium and its equivalent continuum used in analytical solutions and numerical models. Recently, the applicant developed new equivalence equations for the effective porosity to be used for tracer tests in aquifers, and proved them correct with seven field tracer tests, and numerical models. The discovery grant will be used to finish building all equivalence equations for unsaturated properties, two master students (M1, M2) having to improve complex and long tests, helped by 3 undergraduate students. Topic 2: in groundwater papers and reports, there is a systematic confusion between numerical and mathematical convergences. The distinction is made only in recent Computational Fluid Dynamics (CFD) papers and applied mathematics. The proposed research will propose and explain control methods that are needed for groundwater numerical studies. The research will strengthen first findings shown in our recent journal papers. It will involve a master student (M3) and a PhD student (D1). Topic 3: the applicant published a book (2016) on extracting information from grain size distributions and distributions of other parameters. The book is based on a modal decomposition method (MDM), a novel method and line of investigation, developed by the applicant. The Discovery Grant will be used to investigate only one basic problem, that of internal erosion, a hard-to-investigate problem, which is responsible for more than 40% of damage in earth structures (dams, highways, etc.). The proposed research will strengthen initial findings explained in the book. It will involve one master student (M4) and one PhD student (D2), helped by 2 undergraduate students for the tests.

土壤水力特性的新进展 研究总体目标是完善地下水的基础研究、测试方法和数值分析。 在过去的六年里，申请人和他的总部改进了地下水工程中使用的多种方法。他们的研究发表了 54 篇期刊论文和 33 篇论文集，其中 HQP 参与了 86 篇。发现资助计划的研究将研究三个关键的基本主题，检验新想法，提出新解决方案，对其进行测试，并定义新的数值分析工具。这项研究将有助于培养地下水工程领域的 2 名博士生、4 名硕士生和 6 名本科生。 主题 1：真实土壤太复杂，无法使用所有物理细节进行建模。它们不是同质的，而是或多或少分层的。平行于和垂直于各向同性层的饱和导水率有一个古老的等价物。然而，不饱和特性没有等效项，例如保水性和不饱和导水率。因此，需要开发分层介质与其解析解和数值模型中使用的等效连续体之间的所有等价性。最近，申请人开发了用于含水层示踪剂测试的有效孔隙度的新等价方程，并通过七次现场示踪剂测试和数值模型证明了它们的正确性。 发现补助金将用于完成不饱和性质的所有等价方程的构建，两名硕士生（M1、M2）必须在 3 名本科生的帮助下改进复杂而漫长的测试。 主题 2：在地下水论文和报告中，数值和数学收敛之间存在系统性混淆。仅在最近的计算流体动力学 (CFD) 论文和应用数学中才出现这种区别。拟议的研究将提出并解释地下水数值研究所需的控制方法。该研究将加强我们最近的期刊论文中显示的初步发现。它将涉及一名硕士生（M3）和一名博士生（D1）。 主题3：申请人出版了一本关于从粒度分布和其他参数分布中提取信息的书（2016）。本书基于模态分解方法（MDM），这是申请人开发的一种新颖的方法和调查路线。发现补助金将仅用于调查一个基本问题，即内部侵蚀问题，这是一个难以调查的问题，它造成了 40% 以上的土质结构（水坝、高速公路等）损坏。拟议的研究将加强书中解释的初步发现。测试将包括一名硕士生（M4）和一名博士生（D2），并由两名本科生协助进行测试。