Dynamic disaster control of backfill mining under thick magmatic rock in one side goaf: A case study
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Dynamic disaster control of backfill mining under thick magmatic rock in one side goaf: A case study XUE Yan-chao(薛彦超)1, 2, XU Tao(徐涛)1, 2, WASANTHA P L P3, YANG Tian-hong(杨天鸿)1, 2, FU Teng-fei(付腾飞)1, 2 1. Center for Rock Instability and Seismicity Research, Northeastern University, Shenyang 110819, China; 2. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang 110819, China; 3. College of Engineering and Science, Victoria University, Melbourne, Australia © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: In order to explore the control effect of backfill mining on dynamic disasters under special geological mining conditions of overlying thick magmatic rock (TMR), a three-dimensional numerical model of a panel of one side goaf in Yangliu coal mine with double-yield backfill material constitutive model was developed. The simulation results were then compared with field monitoring data. The dynamic disaster control effect of both caving and backfill mining was analyzed in three different aspects, i.e., displacement field, stress field and energy field. The results show that in comparison to the full caving mining method, the bearing capacity of the goaf after backfilling was enhanced, the backfill mining can effectively reduce the stress and energy accumulated in the coal/rock body, and the backfill mining eliminates the further moving space of TMR and prevents its sudden rupture. Before TMR fracture, the subsidence displacement of TMR was reduced by 65.3%, the front abutment stress of panel decreased by 9.4% on average and the high energy concentration zone around panel was also significantly reduced. Overall, the results of this study provide deeper insights into the control of dynamic disasters by backfill mining in mines. Key words: backfill mining; thick magmatic rock; one side goaf; dynamic disaster; numerical simulation Cite this article as: XUE Yan-chao, XU Tao, WASANTHA P L P, YANG Tian-hong, FU Teng-fei. Dynamic disaster control of backfill mining under thick magmatic rock in one side goaf: A case study [J]. Journal of Central South University, 2020, 27(9): 3103−3117. DOI: https://doi.org/10.1007/s11771-020-4532-6.
1 Introduction The control of dynamic disasters due to the extraction of underground coal seams is a significant challenge in underground mining engineering [1−6]. This task is further compounded by the growing trend for coal to be extracted under special geological conditions such as thick magmatic rocks (TMRs) known as key strata.
During the high-intensity underground coal mining, the sudden destruction of overlying TMRs on the roof of panel brings a series of dynamic disaster issues such as rock burst, surface subsidence [7−12]. From 2013 to 2017, there were 32 roof casualty accidents in China, accounting for 19% of coal mine casualty, and 116 roof deaths, accounting for 9%. The severity is second only to gas accidents (Figure 1). Therefore, controlling the dynamic disaster caused by
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