The Diavik Waste Rock Project: Measurement of the thermal regime of a waste-rock test pile in a permafrost environment |
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| Institution: | 1. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;2. School of Civil Engineering and Architecture, Shanxi University of Technology, Hanzhong, Shanxi 723001, China;3. Southwest Research Institute of China Railway Engineering, Chendu 610031, China;1. School of Civil Engineering, Southwest Jiaotong Univ., Chengdu 610031, China;2. MOE Key Laboratory of High-Speed Railway Engineering, Chengdu 610031, China;3. School of Civil Engineering, Sun Yat-sen University, Guangzhou 510275, China;4. State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao Univ, Shijiazhuang 050043, China;1. State Key Laboratory of Frozen Soils Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, China;2. Qinghai-Tibet Railway Company, China;3. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China;1. Shandong Xiehe University, Shandong, Jinan, China;2. Traffic science research institute of shandong, Shandong, Jinan, China |
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| Abstract: | The interior thermal regime of a field-scale experimental waste rock pile in the Northwest Territories, Canada, was studied. Test pile construction was completed in the summer 2006, and temperature data was collected continuously since that time to February 2009. The temperature data indicates the test pile cooled over the study period, with an average heat energy release of ?2.5 × 104 and ?2.6 × 104 MJ in 2007 and 2008, respectively. The mean annual air temperature (MAAT) at the site was ?8.9 °C during the period between 2006 and 2009, with a permafrost table at a depth of 4 m in bedrock away from the pile. Because of this cold environment, the upward movement rate of the 0 °C isotherm into the test pile at its base was approximately 1.5 m a?1 during 2007 and 2008. Thermistor strings installed immediately below the base of the test pile showed the test-pile basal temperatures remained near and below 0 °C during the study period. Furthermore, due to low rates of sulfide mineral oxidation, elevated temperatures in the interior of the test pile were not observed. The average air velocity in the pore space in July 2007 and 2008 was about one third of that during January of each year based on temperature distributions. Therefore, due to higher air velocity during the winter, it is expected that heat transfer is greater during winter. |
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