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Numerical analysis and geophysical monitoring for stability assessment of the Northwest tailings dam at Westwood Mine

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International Journal of Mining Science and Technology 2017年第4期27卷 701-710页

作者： Coulibaly Yaya Belem Tikou Cheng LiZhen Research Institute on Mines and Environment (RIME) Universite du Quebec en Abitibi-Temiscamingue Rouyn-Noranda J9X 5E4 Canada

The Westwood Mine aims to reuse the tailings storage facility #1(TSF #1) for solid waste storage, but,downstream of the Northwest dike is considered critical in terms of stability. This paper uses numerical modeling along with geophysical monitoring for assessing the Northwest dike stability during the restoration phase. The impact of waste rock deposition in the upstream TSF #1 is considered. The geophysical monitoring is based on electrical resistivity methods and was used to investigate the internal structure of the dike embankment in different deposition stages. The numerical simulations were performed with SLOPE/W code. The results show a factor of safety well above the minimum recommended value of 1.5. geophysical monitoring revealed a vertical variation in the electrical resistivity across the dike, which indicates a multilayer structure of the embankment. Without any current in situ data, the geophysical monitoring helped estimating the nature of the materials used and the internal structure of the embankment. These interpretations were validated by geological observation of geotechnical log of the embankment. Based on this study, it is recommended that the water polishing pond be partly filled before waste rock is deposited in TSF #1. In addition, to ensure the stability of the dike, the piezometric head monitoring prior to and during waste rock deposition is recommended.

关键词： Mine tailings impoundment Dike Embankment Numerical analysis Factor of safety geophysical monitoring

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geophysical monitoring technology for CO_2 sequestration

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Applied Geophysics 2016年第2期13卷 288-306,417,418页

作者：马劲风李琳王浩璠谭明友崔世凌张云银曲志鹏贾凌云张树海大陆动力学国家重点实验室西北大学地质学系西安710069 中国石油化工股份有限公司胜利油田分公司物探研究院东营257022 中国石油化工股份有限公司中原油田分公司物探研究院濮阳457001

geophysical techniques play key roles in the measuring, monitoring, and verifying the safety of CO2 sequestration and in identifying the efficiency of CO2-enhanced oil recovery. Although geophysical monitoring techniques for CO2 sequestration have grown out of conventional oil and gas geophysical exploration techniques, it takes a long time to conduct geophysical monitoring, and there are many barriers and challenges. In this paper, with the initial objective of performing CO2 sequestration, we studied the geophysical tasks associated with evaluating geological storage sites and monitoring CO2 sequestration. Based on our review of the scope of geophysical monitoring techniques and our experience in domestic and international carbon capture and sequestration projects, we analyzed the inherent difficulties and our experiences in geophysical monitoring techniques, especially, with respect to 4D seismic acquisition, processing, and interpretation.

关键词： Carbon capture and storage geophysical monitoring 4D seismic monitoring CO2 saturation reservoir pressure

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