Abstract
In order to simplify the ratio decision process of cemented backfill in underground mines and achieve fine decision of filling ratio, the research on the energy matching between surrounding rock and cemented backfill in underground mines was conducted in this study. Based on the cubic function strength model of cemented backfill, the peak specific energy equation of backfill was improved by inversion analysis of the data of filling ratio experiment, and the functional relationship between the peak specific energy and the filling ratio was obtained by regression analysis. Then, based on the energy balance principle between the deformation energy released by the excavation of the underground rock mass and the peak specific energy of the cemented backfill, considering the physical and mechanical parameters of the surrounding rock of the goaf, including bulk density, elastic modulus, and burial depth, a ratio decision model of cemented backfill is established. The application results suggested that the calculation result of the model is reliable, and it can realize the rapid and accurate decision of the ratio of cement backfill in underground mines.
Highlights
Underground mineral resources provide indispensable materials for human use, but the excavation of underground mineral resources may cause a number of safety accidents, such as goaf instability caused by the excavation of underground ore bodies [1,2,3,4,5,6]
The proposed method was only tested on one mine, it is expected that this method can be applied to other mines because the principle of energy balance between surrounding rock and backfill is universal
The purpose of this research was to determine a new methodology for assessing the filling ratios of backfill in mines, and Geofluids the following conclusions were drawn based on the results obtained in this study: (1) The coefficient k was introduced to characterize the position of the inflection point in the stress-strain curve, and the value of k was fixed at 0.55 through experimental data
Summary
Underground mineral resources provide indispensable materials for human use, but the excavation of underground mineral resources may cause a number of safety accidents, such as goaf instability caused by the excavation of underground ore bodies [1,2,3,4,5,6]. Among them, filling the goafs is a more effective method [14,15,16,17] and has been gradually promoted in underground mines [18,19,20,21]. It is worth noting that the rock mass excavation and filling involved in underground mining is a typical fluid-solid coupling problem, and there are many influencing factors that make it difficult to obtain filling ratio of backfill quickly and accurately. The goaf stability is guaranteed with high filling ratios, some other problems can arise, such as a waste of filling materials. It is necessary to carry out research to determine a rapid and accurate decision-making method of the filling ratios of underground mines
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