Self potential and temperature monitoring for seepage detection in embankment dams

用于堤坝渗漏检测的自电位和温度监测

• 批准号: 442293-2012
• 负责人: Butler, Karl
• 金额: $ 3.66万
• 依托单位: University of New Brunswick
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=534348
• 关键词: Self; potential; temperature; monitoring; seepage

Earthen embankment dams are widely used to contain water supplies and hydroelectric reservoirs, as well as wastes such as those produced by mining and oil sands operations. In all cases, there is a need to ensure that any seepage through the dam remains controlled, so as to prevent internal erosion of fine-grained materials and the development of piping, which can lead to collapse and catastrophic flooding or contamination of the environment. UNB and NB Power propose to design, implement and evaluate a novel passive monitoring system for the detection of concentrated water seepage through earthen embankment dams. The project will be based at the Mactaquac Generating Station on the Saint John River near Fredericton, NB, where NB Power would like to monitor the interface between the compacted till core of the embankment dam and the adjoining concrete diversion structure. Although there is no evidence of problematic seepage now, NB Power wishes to enhance its monitoring capabilities in the interest of due diligence, given that the concrete stuctures at Mactaquac suffer from degradation due to Alkali Aggregate Reactivity. Instrumentation will be installed to monitor variations in two parameters influenced by water flow: temperature and electrical self-potentials (SP). Two adjacent boreholes, drilled adjacent to the interface, will be equipped with autonomous fibre optic distributed temperature sensing (DTS) and SP monitoring systems. Additional SP electrodes will be installed on surface on the downstream face of the dam. Design and testing of the SP monitoring system, together with numerical and laboratory modelling of expected temperature and SP responses to various seepage scenarios, will be the focus of a PhD thesis project to be completed over the next 3.5 years. The study site and time frame will allow for improvements to monitoring instrumentation and techniques that are appropriate for large embankment dams operating through cold winters and hot summers.

土质堤坝被广泛用于控制供水和水电水库，以及采矿和油砂作业产生的废物。在所有情况下，都需要确保大坝的任何渗漏都得到控制，以防止细颗粒材料的内部侵蚀和管道的发展，这可能导致坍塌和灾难性的洪水或环境污染。UNB和NB Power提议设计、实施和评估一种新的被动监测系统，用于检测土堤防大坝的集中渗水。该项目将在新泽西州弗雷德里克顿附近圣约翰河上的Mactaquac发电站进行，NB Power希望在那里监测堤防大坝的压实核心和相邻的混凝土导流结构之间的界面。虽然目前没有证据表明有问题的渗漏，但鉴于Mactaquac的混凝土结构由于碱骨料反应性而遭受退化，NB Power希望加强其监测能力，以尽职调查。将安装仪器来监测受水流影响的两个参数的变化：温度和自电位（SP）。两个相邻的井眼将安装自主光纤分布式温度传感（DTS）和SP监测系统。额外的SP电极将安装在大坝下游的表面上。博士论文项目将在未来三年半内完成，重点是设计和测试地热监测系统，以及对不同渗漏情况下的预期温度和地热响应进行数值和实验室模拟。研究地点和时间框架将允许改进监测仪器和技术，这些仪器和技术适用于在寒冷的冬季和炎热的夏季运行的大型堤防水坝。