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: $ 3.9万
• 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: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=553551
• 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.

土堤大坝被广泛用于包含水供应和水力储层，以及诸如采矿和油砂行动所产生的水。在所有情况下，有必要确保通过大坝进行任何渗漏，以防止内部侵蚀细粒材料和管道的发展，这可能导致崩溃和灾难性的洪水或环境污染。 UNB和NB功率建议设计，实施和评估一种新型的无源监测系统，以通过土堤坝检测浓缩水渗漏。 该项目将位于NB弗雷德里克顿附近的圣约翰河上的Mactaquac发电站，NB Power希望监视紧凑型堤坝的紧凑型直到堤坝的核心与毗邻的混凝土转移结构之间的界面。尽管现在没有渗入问题的证据，但由于Mactaquac在Mactaquac的混凝土构成因碱骨料的反应性而导致降解，因此NB的权力希望增强其监测能力。将安装仪器，以监视受水流影响的两个参数的变化：温度和电力电位（SP）。两个与界面相邻的相邻钻孔将配备自动纤维分布式温度传感（DTS）和SP监测系统。其他SP电极将安装在大坝下游面的表面上。 SP监测系统的设计和测试，以及对各种渗流场景的预期温度和SP响应的数值和实验室建模，将是博士学位论文项目的重点，该项目将在未来3。5年内完成。研究地点和时间范围将允许改进监视适用于通过冷冬季和炎热夏季运行的大型路堤大坝的仪器和技术。