Parametric stability analysis of pillar performance at Nohyun limestone mine, South Korea—a case study

Kim, Jong-Gwan; Abdellah, Wael R.; Yang, Hyung-Sik

doi:10.1007/s12517-019-4550-6

Cited by 8 publications

(5 citation statements)

References 14 publications

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“…The constraint of these empirical formulations is that they mostly deal with vertical stress acting normal on a pillar and not the complex three-dimensional (3D) stress state exhibited in underground mines. Additionally, it can't be employed in irregular pillar patterns and inclined pillars to determine the average stress [25]. This average stress acting on a pillar is determined by the shear area of the room and the remaining area ratio as well as the stress concentration between adjoining rooms.…”

Section: Pillar Pressure Estimationmentioning

confidence: 99%

“…The numerical approach tends to account for all the limitations identified when employing empirical conventional solutions including the complex mine layout, pillar patterns, inclination and 3D stress state. Several numerical codes are present to analyze pillar stability, some researchers employed these tools to analyze pillar stability including but not limited to [5,8,25,[31][32][33][34][35][36][37][38][39]. In this study, we employ FLAC 3D to analyse the stability of an inclined ALS and pillars in an underground Gold mine.…”

Section: Numerical Analysismentioning

confidence: 99%

“…Even though the empirical solutions can determine pillar strength and stability to some extent. It must be emphasized that these tools cannot determine failure accurately by considering the interaction of the stress, geomechanics conditions, and ALS inclination [25]. Additionally, the tributary area method is not tailored for such conditions as such numerical modelling is the only method to determine pillar performance after excavation.…”

Section: Numerical Stability Assessmentmentioning

confidence: 99%

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Timber props standing support structures as replacement of extracted pillars in an inclined Airleg stope

Kabwe

2022

Preprint

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Effective extraction of pillars in airleg stopes requires an understanding of the failure mechanism and stability of pillars. Pillars can be extracted efficiently and safely by replacing them with standing supports that can handle the roof load. However, most pillar extraction is conducted in flat dipping stopes which neglects the influence of the horizontal stress on pillar stability by increasing the sliding potential along planes. In this study, an effective pillar extraction simulation in an inclined airleg stope is conducted with an intent to recover 100% ore and leave the rooms supported with pillar replacements. Firstly, an empirical stability analysis is done to ascertain the direction and magnitude of the stress components acting on a pillar in an inclined stope. Thereafter a finite volume numerical simulation in FLAC 3D is performed to further determine the strength-stress ratio distribution and pressure on the pillars. It is concluded from the empirical and numerical results that pillar strength deterioration is influenced by an increase in the stope inclination. Furthermore, the inclination introduces a horizontal stress component which increases the pressure acting on a pillar. It is also ascertained that the stress concentration and yielding are more extensive on the acute side of the pillars. Therefore, the appropriate support system requires coupling the 6-set timber props (propsetters) structure with the wedged head and floorboards installed at an offset distance from the mined-out pillars.

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Section: Pillar Pressure Estimationmentioning

confidence: 99%

Section: Numerical Analysismentioning

confidence: 99%

Section: Numerical Stability Assessmentmentioning

confidence: 99%

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Timber props standing support structures as replacement of extracted pillars in an inclined Airleg stope

Kabwe

2022

Preprint

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“…Indeed, stress environments and pillar size and other factors are very challenging to be investigated by deterministic approaches (Mortazavi et al 2009). Benefitting from the advance of computer technology and the improvement of machine abilities, numerical simulation technology has been applied to help understanding the mechanism of pillar failure by quantitatively analyzing the impact of possible rock properties (Mortazavi et al 2009;Ma et al 2016;Arthur et al 2016;Renani and Martin 2018;Kim et al 2019;Kumar et al 2019). Although the results of a small number of numerical simulations do not necessarily match the observed pillar conditions due to the inaccurate representation of field conditions and the necessary simplification for the establishment of numerical models, numerical simulation is currently one of the most popular methods in pillar stability analysis and research.…”

Section: Introductionmentioning

confidence: 99%

Stochastic assessment of hard rock pillar stability based on the geological strength index system

Zhou

Armaghani

et al. 2021

Geomech. Geophys. Geo-energ. Geo-resour.

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Hard rock pillar is a crucial rock mass structure to maintain the stability of underground mine. It needs of special attention to analyze its stability from the point of rock mass quality. In this paper, the geological strength index (GSI) representing the rock mass quality of the hard rock pillar is examined as a new influence factor of stability, and combined with the conventional parameters (uniaxial compressive strength (UCS) of intact rock mass, width of pillar (w), height of pillar (h), the ratio of pillar width to its height (w/h)) to complete the stochastic assessment of the stability of hard rock pillar. The 47 actual cases of hard rock pillar improved by numerical simulation software Flac 3D . An empirical formula fitted by the Least Square method and artificial intelligence prediction models are used to estimate the pillar strength combining with the pillar stress to conduct the probability and reliability analysis in the Monte Carlo simulation. The result of stochastic assessment showed that UCS and w still play a vital role in maintaining pillar stability, but the influence of GSI cannot be ignored. It found that the GSI has a greater influence on the sloughing pillars in comparison with stable and failed hard rock pillars. Concluding remarks is that GSI has crucial effects on the stability of hard rock pillars as well as UCS of the rock mass and shape of pillars (w and h). Thus, the GSI should be considered as one of input parameter for pillar design and stability assessment in underground mines.

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“…There are main self-factors and external factors that affect the stability of the pillar. The self-factors include the mechanical properties, internal cracks, size, and structural characteristics of pillars [24][25][26][27][28]. The external factors include burial depth, in situ stress, treatment method of goaf, overburden stratum structure, water environment, and dip angle.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of Underground Pillar Supporting System under Different Disturbed Stresses

Liu

Zhang

et al. 2021

Geofluids

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Small external disturbances may destabilize the bearing pillar, which in turn will change the stress distribution of the pillar supporting system, leading to its overall instability. Based on the engineering background of a mine and the mechanical analysis of pillar under disturbed stress, this paper investigated the stress, strain, and plastic zone of the pillar supporting system under different disturbed stresses. Then, the chain instability of the pillar supporting system was achieved. The law of stress transfer and plastic development of the pillar supporting system was explored. The results showed that the greater the disturbed stress, the faster the increase rate of the maximum stress of the pillar supporting system. As the width of the pillar increased, the maximum stress of the pillar decreased, so its risk of damage decreased. As the disturbed stress increased, the maximum principal strain and equivalent plastic strain of the 6 m wide pillar increased approximately linearly, and their growth rates of the 4 m wide pillar gradually increased. In the process of chain instability of the pillar supporting system, the sides of the middle pillar were destroyed first, and then the plastic zone gradually penetrated, causing the stress of the adjacent pillar to increase, which in turn led to its destruction. By analyzing the monitoring data of stress, displacement, or plastic strain, the instability of the pillar can be predicted.

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Parametric stability analysis of pillar performance at Nohyun limestone mine, South Korea—a case study

Cited by 8 publications

References 14 publications

Timber props standing support structures as replacement of extracted pillars in an inclined Airleg stope

Timber props standing support structures as replacement of extracted pillars in an inclined Airleg stope

Stochastic assessment of hard rock pillar stability based on the geological strength index system

Stability Analysis of Underground Pillar Supporting System under Different Disturbed Stresses

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