Strategies for surface crown pillar design using numerical modelling – A case study

Chen, Tuo; Mitri, Hani S.

doi:10.1016/j.ijrmms.2020.104599

Cited by 14 publications

(6 citation statements)

References 27 publications

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“…Crown thickness for the transition zone of a gold mine was designed using FLAC3D and same model was used for replacement of the crown with artificial pillar [4]. FLAC3D is used to perform parametric study to investigate the effect of fault properties and horizontal-to-vertical in-situ stress ratio on surface crown pillar stability [13].…”

Section: Existing Methodologiesmentioning

confidence: 99%

Stability of Crown Pillar during Transition from Open Pit to Underground Mining

Prasad Verma,

K. Soni

2024

Technologies in Mining [Working Title]

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Mineral deposits at shallow depth are on the verge of exhaustion and transiting to underground mining operations, for extraction of deposits at depth has now become inevitable. The depth of open pit mine is generally governed by the stripping ratio and lateral extent of lease. When open pit reaches its ultimate designed depth and the ore is still existing at greater depth transition is must and barrier pillar needs to be left in between both the workings. If underground mining is below an opencast mine then stability of barrier/crown pillar between open pit and underground mining becomes critical especially when non-caving method is to be followed. It has its own implications and maintaining safety of pit and slope along with underground workings becomes a real challenge. Ground monitoring in terms of induced stresses and displacement holds paramount importance. The most popular method in metal mining is Long Hole/Blast Hole Stoping Method in top down sequence. Earlier hydraulic fill was common and is now being slowly replaced by Paste fill. In this chapter a few challenges existing in Indian mining scenario is discussed along with review of methodologies for optimum design of crown pillar. Parameter influence is also explored for its stability.

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Section: Existing Methodologiesmentioning

confidence: 99%

Stability of Crown Pillar during Transition from Open Pit to Underground Mining

Prasad Verma,

K. Soni

2024

Technologies in Mining [Working Title]

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“…When utilizing numerical methods to design and optimize the structural parameters of mining sites, careful consideration must be given to selecting appropriate software based on the specific mining methods employed and the indicators under analysis during the design process. The commonly used types of numerical simulation software for mining engineering are shown in Table 5 [98][99][100][101][102][103][104]. The general process of utilizing numerical simulation methods for designing structural parameters in mining sites involves several key steps.…”

Section: Numerical Simulation Methodsmentioning

confidence: 99%

Stope Structural Parameters Design towards Green and Deep Mining: A Review

Zhou,

Zhao,

et al. 2023

Processes

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A reliable design of stopes is critical to ensure both safety and efficiency in mining operations. The evolving mining methods and technologies as well as increasing mining depth dictate the need to continually improve stope designs. This paper presents a comprehensive review in order to compare and consolidate various stope design methods. This review covers various aspects of stope design, including design principles, factors to consider, and the diverse range of design methods available. The results led to the classification of various methods encompassing engineering analogies, fundamentals, numerical simulations, and industrial tests. Of particular significance, the review furnishes detailed insights into the research conducted on each method, as well as each method’s practical performance in engineering applications. Furthermore, the review highlights the inherent limitations in current design methods and suggests potential avenues for future research. Finally, by comprehensively considering the functional roles and advantages of each design method, it overcomes the limitations of relying solely on a single method for stope structural parameter design, and a general process is proposed.

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“…Gob gangue is generally simulated by the Double-Yield or elastic models [33]. However, the Double-Yield model has many parameters, and the parameter checking is more complicated, so the elastic model is used for simulation.…”

Section: Mechanical Characterization Of Gob Ganguementioning

confidence: 99%

Numerical Simulation Study on Stability Control Technology of Large-Area Wall Caving Area (LAWCA) in Large-Inclined Face

Liu

et al. 2023

Geofluids

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The caving characteristics of the goaf significantly impact the mining stability of the working face. The coal-forming environment of the steeply dipping coal seam is complex. After mining, the caving rock mass rolls to the lower part of the working face due to gravity, and the caving compaction characteristics of the working face are different from those of the flat and gently inclined working face, taking Huainan Xinji No. 2 Mine 211112 high-angle composite roof working face large-area gang roof fall area as the engineering background. To safely pass through a large roof fall area, a FLAC3D numerical simulation method considering the goaf’s compaction effect and the excavation’s additional damage is proposed. The Weibull distribution function is introduced to modify the elastic modulus parameters of the rock mass after excavation, which more accurately reflects the damage process of the rock mass after hole. Based on the goaf compaction theory, the elastic model is developed for the second time, and the accurate simulation of the caving rock mass is realized. On this basis, the proposed numerical simulation method is used to simulate the large-area roof caving of the large-angle working face, a scheme to control the stability of the working face by using the paste filling technology is proposed, and the material parameters of the filling body are determined. The research results show that when the water-cement ratio of the backfill is 3 : 1, the simulation and field trial results are good, and the safe and efficient mining of the large-angle composite roof working face is realized, which verifies the feasibility and correctness of the coupled simulation method. At the same time, the research results can provide a reference for controlling the roof fall area of the working face with a large inclination angle.

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Strategies for surface crown pillar design using numerical modelling – A case study

Abstract: A thesis submitted to McGill University in partial fulfillment of the requirements of a degree of Master of Engineering in the Department of Mining and Materials Engineering.

Cited by 14 publications

References 27 publications

Stability of Crown Pillar during Transition from Open Pit to Underground Mining

Stability of Crown Pillar during Transition from Open Pit to Underground Mining

Stope Structural Parameters Design towards Green and Deep Mining: A Review

Numerical Simulation Study on Stability Control Technology of Large-Area Wall Caving Area (LAWCA) in Large-Inclined Face

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