Evaluation of safety and deformation characteristics of cemented tailings backfill mining disturbed area near shafts: a
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ORIGINAL ARTICLE
Evaluation of safety and deformation characteristics of cemented tailings backfill mining disturbed area near shafts: a case study in China Feifei Jiang . Hui Zhou Yilong Zhou
. Jia Sheng . Xiangdong Li . Yong Hu .
Received: 1 June 2020 / Accepted: 7 August 2020 / Published online: 19 August 2020 Ó Springer Nature Switzerland AG 2020
Abstract To evaluate the safety conditions and deformation characteristics of the cemented tailings backfill (CTB) mining disturbed area near shafts of Taohuazui Gold Mine in China, an analytic hierarchy process—fuzzy comprehensive evaluation (AHP-FCE) model for disturbance degree and safety evaluation of backfill mining was established, the historical and current backfill mining processes were simulated based on 3DEC. The theoretical analysis results were verified by field monitoring during the industrial test. The results show that: (1) More than 80% of historical backfill stopes have a weak disturbance (level II) to the shafts, the distance between stope and shafts (C1) and the blasting method (C3) have the most significant influence on the F. Jiang H. Zhou (&) State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, Hubei, China e-mail: [email protected] F. Jiang H. Zhou University of Chinese Academy of Sciences, Beijing 100049, China J. Sheng X. Li Y. Zhou National Engineering Research Center for Metal Mining, Changsha Institute of Mining Research Co., Ltd., Changsha 410012, Hunan, China Y. Hu Hubei Sanxin Gold Copper Co., Ltd., Daye 435100, Hubei, China
evaluation results. (2) The numerical simulation results validate the rationality of the AHP-FCE model and its evaluation results, and the shafts are in a microdisturbance deformation state of 1–3 mm, which does not exceed the allowable value. (3) The theoretical analysis results are consistent with the field monitoring results, and the disturbance degree and its variation trends induced by the CTB mining are gentle. At present, the overall safety and stability of the shafts and its adjacent areas are good. Keywords Backfill mining disturbance AHP-FCE model Safety evaluation Deformation characteristics Surface subsidence Microseismic monitoring
1 Introduction The safety problems under the disturbance of mining activities have always been the focus of attention and critical research content in the field of underground mines (Altun et al. 2010; Li et al. 2007; Xu et al. 2015; Zhao and Zhang 2017). The cemented tailings backfill (CTB) mining method has been widely used due to its outstanding advantages in surface subsidence and rock deformation control, mining safety, tailings treatment, and environmental protection (Qi and Fourie 2019; Sun et al. 2018). Previous studies have revealed the process and mechanism of rock deformation,
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instability, and failure under the disturbance of openstope mining (Ren et al. 2010; Sun et al. 2015) or caving mining (Cheng et al. 2017; Li et al. 20
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