Optimum location of last-mined stope with the influence of backfilling

Xu, Huawei; Apel, Derek B.

doi:10.46873/2300-3960.1022

Cited by 3 publications

(5 citation statements)

References 17 publications

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“…In the previous studies [ 32 , 33 ], the authors used the two-dimensional (2D) models to analyze the displacement of the crosscuts to assess the stability of the stopes, and the displacement was the only factor in conducting the assessment. To make a more precise and comprehensive analysis and prediction, a full-sized elastoplastic three-dimensional (3D) model was developed in this paper by simulating the whole mining schedule process of stope excavation and backfilling.…”

Section: Discussionmentioning

confidence: 99%

“…In a two-dimensional study, with the influence of the backfilled CRF, in the process of sill pillar recovery, the two edges of the mining pipe have a higher possibility of instability in the overcuts and undercuts compared to the crosscuts in the middle area of the mining level [ 32 , 33 ]. The stope access from three representative locations of left-edge, middle line, and right-edge are analyzed to conduct the assessment, as shown in Figure 12 .…”

Section: Assessment Of the Stope Accesses Stability Among Three-pilla...mentioning

confidence: 99%

“…According to Sepehri [ 30 ] and Xu [ 32 , 33 , 39 ], the boundaries of the mining pipe MP#1 have higher tangential stress than the center of the mining pipe, and with the increase of the mining depth, the possibility of the potential rockburst is higher. Hence, the stope accesses to the undercuts of stopes in Sill-1 from the three locations are chosen to conduct the assessment.…”

Section: Assessment Of the Stope Accesses Stability Among Three-pilla...mentioning

confidence: 99%

“…Cemented rockfill (CRF) is widely used to improve the stability and safety of the whole mining pipe and the sill pillar recovery, while, in many cases, compared with the host rocks, the strength of the CRF is relatively lower [ 18 , 19 , 20 , 28 , 29 , 30 , 31 , 32 , 33 ]. Sill pillar recovery with the influence of backfilled CRF in the blasthole stoping (BHS) mining method has not been widely discussed.…”

Section: Introductionmentioning

confidence: 99%

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Investigation and Stability Assessment of Three Sill Pillar Recovery Schemes in a Hard Rock Mine

Apel

Wang

et al. 2022

Energies

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In Canada, many mines have adopted the sublevel stoping method, such a blasthole stoping (BHS), to extract steeply deposited minerals. Sill pillars are usually kept in place in this mining method to support the weight of the overburden in underground mining. To prolong the mine’s life, sill pillars will be recovered, and sill pillar recovery could cause failures, fatality, and equipment loss in the stopes. In this paper, three sill pillar recovery schemes—SBS, SS1, and SS2—were proposed and conducted to assess the feasibility of recovering two sill pillars in a hard rock mine by developing a full-sized three-dimensional (3D) analysis model employing the finite element method (FEM). The numerical model was calibrated by comparing the model computed ground settlement with the in situ monitored ground settlement data. The rockburst tendency of the stope accesses caused by the sill pillar recovery was assessed by employing the tangential stress (Ts) criterion and burst potential index (BPI) criterion. All three proposed sill pillar recovery schemes were feasible and safe to recover the sill pillars in this hard rock mine, and the scheme SBS was the optimum one among the three schemes.

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Section: Discussionmentioning

confidence: 99%

Section: Assessment Of the Stope Accesses Stability Among Three-pilla...mentioning

confidence: 99%

Section: Assessment Of the Stope Accesses Stability Among Three-pilla...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation and Stability Assessment of Three Sill Pillar Recovery Schemes in a Hard Rock Mine

Apel

Wang

et al. 2022

Energies

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“…Table 1 shows the rock mechanical properties applied in the model in this study [15,16,27]. Here, E is the elastic Young's modulus, ν is the Poisson's ratio, γ is the unit weight, ϕ is the angle of friction, C is the cohesive strength, σc is the uniaxial compressive strength and σt is the tensile strength.…”

Section: Mechanical Properties Of the Modelled Rock And Backfilling Crfmentioning

confidence: 99%

Study of the Influence of Backfilling on Stability and Location of Remaining Stopes in Sill Pillar Recovery

Xu¹

2021

GEOMATE

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To extract steeply dipping orebodies, many mines in Canada have adopted the sublevel stoping method, such as blasthole stoping (BHS) and sublevel longhole retreat (SLR). In such methods, sill pillars are initially kept in place to support the weight of the overburden in underground mining. After the stope mining is complete, the stope voids will be backfilled with cemented rockfill (CRF). The strength of the CRF affects the stability of the adjacent stopes in the sill pillar recovery excavation scheme. Sill pillar recovery may cause prolonged failure, fatality, and equipment loss. Choosing a rational location of the last mined stope in sill pillar recovery can effectively eliminate the possible instability caused by the sill pillar recovery process. This paper uses the Finite Element Method (FEM) to present a comparison of sidewall swellings, floor heaves, and the roof subsidence of the crossing cuts in each stope among different last mined stope location scenarios. At all the 21 location scenarios, most of the roof corner displacements in undercuts are less than 10 cm, while in the overcuts, all the displacements in roof corners are over 10 cm. The values of the floor heave in the overcuts are more than 7 times that in the undercuts. Roofs in both undercuts and overcuts are prone to failures. Floors in the undercuts are more stable than the floors in the overcuts. For the optimum location of the last mined stope in sill pillar recovery, the last mined stope should be at least four-stope-width away from the two sill pillar edges.

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Underground Disposal of Coal Gangue Backfill in China

et al. 2022

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China’s total coal production in 2021 exceeded 4.13 billion tons, 52% of the world’s total. Coal gangue, a solid waste of coal mining accounts for 15–20% of coal production, when directly discharged on the ground surface as waste heaps, it occupies large areas of land and cause environmental pollution. This paper summarizes the existing gangue backfilling methods, their working principles, efficiency, and application status. The methods that are meeting Middle and Western China’s mining demands are discussed in detail. The state-of-the-art technologies that can realize high-efficiency, centralized, and large-scale underground backfilling of coal gangue are analyzed. This paper shows that the industrial implementation of these technologies can increase the current maximum disposal capacity of coal gangue by three times, reaching five million tons per year. The equipment innovation and automation are analyzed, and the environmental effect of coal gangue backfilling is discussed. This review offers inspirations and guidelines for coal gangue disposal and the environmental hazard reduction of coal mining.

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Optimum location of last-mined stope with the influence of backfilling

Cited by 3 publications

References 17 publications

Investigation and Stability Assessment of Three Sill Pillar Recovery Schemes in a Hard Rock Mine

Investigation and Stability Assessment of Three Sill Pillar Recovery Schemes in a Hard Rock Mine

Study of the Influence of Backfilling on Stability and Location of Remaining Stopes in Sill Pillar Recovery

Underground Disposal of Coal Gangue Backfill in China

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