A constitutive model to analyse internal erosion in embankment dams

分析堤坝内侵蚀的本构模型

• 批准号: 507630-2016
• 负责人: Fannin, Robin
• 金额: $ 12.25万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=693962
• 关键词: constitutive; model; analyse; internal; erosion

Canada is the world's biggest producer of hydroelectric power. British Columbia, like Quebec, Manitoba, Newfoundland and Labrador, and the Yukon, generates almost 90 % of its energy from renewable hydropower sources. The Bennett Dam in British Columbia was, upon completion of construction in 1967, the largest embankment dam in the world. Three dams (the Bennett, Mica, and Revelstoke dams) generate over half of the province's electricity. They represent an enormous investment by society-at-large and, like much of our public infrastructure, these embankment dams are aging, yielding a potential for water seeping from the reservoir to erode soil within the dam and its foundation. Internal erosion is a dam safety risk that was not understood at the time of construction - it is now recognised to pose one of the greatest risks to dam safety.We propose a joint research project with BC Hydro (BCH) to address the questions of where, and when, internal erosion may occur in an embankment dam. We will perform laboratory tests on soil from embankment dams, and compare the findings with forensic observations at the now-decommissioned Coursier Dam, and with field monitoring data available around the sinkhole incidents at the Bennett Dam. We will formulate and calibrate a constitutive model to analyse where erosion can be expected to initiate, and at what rate it progresses, within the body of an embankment dam. Given the similarity of geologic processes and soil formation across Canada, the findings will be of general relevance to northern-climate embankment dams, regardless of size or purpose. Our proposed work will benefit the Canadian dam sector by placing its commitment to dam safety at a level that is undeniably world-class, and befitting of a country that is the biggest producer of hydroelectric power in the world.

加拿大是世界上最大的水力发电生产国。不列颠哥伦比亚省，如魁北克、马尼托巴省、纽芬兰、拉布拉多和育空地区，近90%的能源来自可再生水电。不列颠哥伦比亚省的贝内特大坝在1967年竣工时是世界上最大的堤坝。有三座大坝(贝内特大坝、云母大坝和雷弗尔斯托克大坝)产生了该省一半以上的电力。它们代表着整个社会的巨大投资，就像我们的许多公共基础设施一样，这些堤坝正在老化，可能会从水库渗出，侵蚀大坝及其地基内的土壤。内蚀是一种大坝安全风险，在建造时还没有被认识到--它现在被认为是对大坝安全构成的最大风险之一。我们建议与BC Hydro(BCH)联合开展一项研究项目，以解决土石坝可能在何时何地发生内部侵蚀的问题。我们将对堤坝的土壤进行实验室测试，并将结果与现已退役的库西耶大坝的法医观察结果以及班尼特大坝天坑事件周围的现场监测数据进行比较。我们将制定和校准一个本构模型，以分析在土石坝坝体内，侵蚀可能在哪里开始，以及侵蚀的发展速度如何。鉴于加拿大各地地质过程和土壤形成的相似性，这些发现将对北方气候的堤坝具有普遍的相关性，无论其规模或用途如何。我们拟议的工作将使加拿大大坝部门受益，使其对大坝安全的承诺达到无可否认的世界级水平，并适合作为世界上最大的水电生产国的国家。