Stability analyses of side-exposed backfill considering mine depth and extraction of adjacent stope

Wang, Ruofan; Zeng, Feitao; Li, Li

doi:10.1016/j.ijrmms.2021.104735

Cited by 29 publications

(7 citation statements)

References 34 publications

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“…In underground metal mining, the empty-space subsequent filling mining method has become one of the main mining schemes because of its advantages of high production capacity, low cost, high recovery rate, and protection of underground and surface environments [1][2][3][4][5][6][7]. The empty-space subsequent filling mining method, whether it is staged open-field subsequent filling or segmented open-field subsequent filling, generally divides the ore block into a one-step mining room and a two-step ore pillar during the mining process and carries out the mining in two steps.…”

Section: Introductionmentioning

confidence: 99%

Study of the Critical Safe Height of Goaf in Underground Metal Mines

Zhang,

Chen

et al. 2024

Minerals

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The empty-space subsequent filling mining method is the main mining scheme for underground metal mines to achieve large-scale mechanized mining. The stage height, one of the main parameters of this method, affects the various production process aspects of the mine and influences the stability of the goaf. In order to determine the stage height scientifically and rationally in the empty-space subsequent filling mining method, a formula for the stabilized critical safe height of a high goaf in an underground metal mine was derived based on Pu’s arch equilibrium theory, Bieniawski’s pillar strength limit theory, and the Kastner equation and combined with the results of an orthogonal analysis to rank the importance of the main factors in the formula. A copper mine in Jiangxi Province was used as a case study, with the reliability of the formula verified by numerical simulation and industrial testing. The factors in the formula influencing the critical stabilized safe height of the goaf were, in descending order, the compressive strength of the rock body, the width of the two-step mining pillar, the width of the one-step mining room, the mining height, and the depth of mining. Based on the calculation results, the recommended stage heights are 30 m (−378 m middle section) and 25 m (−478 m middle section) in the area of poor rock body stability and 50 m in the area of better rock body stability. The simulation results show that the goaf is significantly affected by the compressive stress under the condition of a certain rock body stability and that the compressive stress increases with increasing goaf height. The minimum recommended values of the sidewall safety coefficients in areas of poor and better rock stability are 1.04 and 1.06, respectively. The volume deviation coefficients of the three industrial test mines were all controlled within 3%, indicating that no obvious collapse and destabilization phenomenon occurred in the goaf. This paper provides some theoretical and applied guidance for the stage height design of similar underground metal mines using the empty-space subsequent filling mining method.

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Section: Introductionmentioning

confidence: 99%

Study of the Critical Safe Height of Goaf in Underground Metal Mines

Zhang,

Chen

et al. 2024

Minerals

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“…However, almost all publications on mining backfill have focused on the behaviour of a single type of backfill, including the extensive works conducted by Li and co-workers over the past two decades (Aubertin et al 2003;Béket Dalcé et al 2019;El Mkadmi et al 2014;Jaouhar et al 2018;Jaouhar & Li 2019;Keita et al 2021aKeita et al , 2021bLi et al 2003;Li et al 2005;Li & Aubertin 2012;Li 2014aLi , 2014bLiu et al 2017aLiu et al , 2017bLiu et al , 2018Pagé et al 2019;Qin et al 2021aQin et al , 2021bWang et al 2021aWang et al , 2021bWang & Li 2022;Yang et al 2017Yang et al , 2018Zhai et al 2021;Zheng et al 2019Zheng et al , 2020aZheng et al , 2020bZheng et al , 2020c. Research on the natural mixing behaviour between the waste rocks and paste backfill is absent in the literature.…”

Section: Introductionmentioning

confidence: 99%

Natural mixing behaviour of waste rocks poured in a paste backfill

Zhang¹,

Li²

2023

Paste 2023: 25th International Conference on Paste, Thickened and Filtered Tailings

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In underground mines, large quantities of waste rock can be produced during development in order to access ore bodies. The waste rock is typically hoisted to the surface and transported to a specific place to make a structure called a waste rock pile. This practice requires energy consumption and generates additional operating costs for transporting waste rock from underground to the surface. Alternatively, the waste rock can be poured directly into underground mine stopes filled with paste backfill. As a result, energy consumption and additional operating costs for transporting the waste rock from underground to the surface are avoided or significantly reduced. However, the natural mixing behaviour of waste rocks poured in paste backfill has never been studied. The fill mass generated by this practice can fail and collapse upon a side-exposure associated with the excavation of an adjacent stope if a poor mixture between the cohesionless waste rocks and cemented paste backfill takes place around the exposed face. Thus, it is critical to understand the mixing behaviour of waste rocks poured in paste backfill. To this end, a series of physical model tests have been performed in the laboratory. The results, in part, are presented and discussed in this paper.

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“…There are many different mining methods with backfill in underground metal mines, but long-hole open stoping with delayed backfill mining is widely used worldwide (Emad et al, 2014;Wang et al, 2021). First, the primary stopes are mined, and the CTB fills the mined voids.…”

Section: Introductionmentioning

confidence: 99%

Initial pore distribution characteristics and crack failure development of cemented tailings backfill under low impact amplitude

Zheng,

Liu,

Guo

et al. 2023

Front. Earth Sci.

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The stability of the cemented paste backfill is threatened by the dynamic disturbance during the excavation of the surrounding ore body. In this paper, the computerized tomography (CT) and Split Hopkinson Pressure Bar (SHPB) tests were conducted to explore the initial pore distribution characteristics of the cemented tailings backfill (CTB) and the development of the crack under low impact amplitude. SHPB tests were conducted with impact amplitudes of 34, 37, and 39 mV, respectively. Results show that the initial pores of CTB were steadily distributed with the height of CTB. The CTB contained many initial pores with similar pore size distribution characteristics, and the largest number of pores is between 0.1 and 0.3 mm. Most of the cracks in CTB after low impact amplitude develop and expand along the initial pores, and the damage of CTB mainly exists in shear cracks. A dependence has been established that the dynamic uniaxial compressive strength of the CTB increases, the total crack volume first increases and then decreases, and the number of cracks increases as the impact amplitude increases. The research results can provide a valuable reference for the dynamic performance of CTB under low impact amplitude and the design of mining backfill.

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Stability analyses of side-exposed backfill considering mine depth and extraction of adjacent stope

Cited by 29 publications

References 34 publications

Study of the Critical Safe Height of Goaf in Underground Metal Mines

Study of the Critical Safe Height of Goaf in Underground Metal Mines

Natural mixing behaviour of waste rocks poured in a paste backfill

Initial pore distribution characteristics and crack failure development of cemented tailings backfill under low impact amplitude

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