Numerical Analysis of the Hydraulic and Mechanical Behavior of In Situ Cemented Paste Backfill
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ORIGINAL PAPER
Numerical Analysis of the Hydraulic and Mechanical Behavior of In Situ Cemented Paste Backfill Di Wu
. Wentao Hou . Hua Yang . Lijie Guo
Received: 27 December 2019 / Accepted: 29 April 2020 Ó Springer Nature Switzerland AG 2020
Abstract Although the most explicit approach to acknowledge the behavior of in-stope CPB is to utilize monitoring instruments to collect relevant data, such as pore water pressure, total stress and temperature, the in situ monitoring may lead to production delays and rising costs. An alternative solution is using numerical simulation method to understand the behaviors of field CPBs that are placed in stopes. Hence, a numerical model, which considers the binder hydration process, hydraulic (pore water pressure) and mechanical (total stress, uniaxial compressive stress) properties, is developed to analyze the performances of in-stope CPBs. The proposed model is validated by comparing field monitoring data with corresponding results predicted by model simulation. Satisfactory agreement is detected between the modeling results
and monitoring data, validating the capability of the developed model in well describing the hydraulic and mechanical behaviors of CPBs placed in field stopes. Understanding the characteristics of field paste backfill matrix is of great importance in improving its ultimate mix design with respect to cost savings. This study also contributes to a better understanding of the hydro-mechanical performance of field CPB structures. Keywords Cemented paste backfill Pore water pressure Mechanical behavior Numerical model Stope
1 Introduction D. Wu (&) W. Hou School of Energy and Mining Engineering, China University of Mining and Technology-Beijing, Ding 11 Xueyuan Road, Haidian District, Beijing 100083, China e-mail: [email protected] D. Wu School of Civil, Environmental and Mining Engineering, The University of Western Australia, Crawley, Australia H. Yang Tibet Huatailong Mining Development Co., Ltd., Lhasa, China L. Guo BGRIMM Technology Group, Beijing, China
Exploitation of underground mineral resources provides people valuable mineral products, but in doing so, it also creates mined-out areas and mine wastes, such as tailings. Tailings are commonly stored in tailing ponds, likely causing serious consequences, such as environmental contamination and failure of tailings dam. Besides, the underground voids also pose a threat to the safe mining of adjacent stopes or even result in ground subsidence. In the past decades, cemented paste backfill (CPB), a mixture of tailings, binder and water, has been created and utilized as the material to fill mined-out areas. Thereby, the CPB
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technology can be provided with the advantage of both tailing disposal and ground control (e.g., Cao et al. 2018; Jiang et al. 2019; Kou et al. 2020; Xue et al. 2018; Yilmaz et al. 2013; Yilmaz 2018). Besides, ore pillars can be replaced by CPBs, which is a contribution to the improvement of ore recovery pe
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