Effect of dip on pillar strength

Jessu, Kashi Vishwanath; Spearing, A.J.S.

doi:10.17159/2411-9717/2018/v118n7a10

Cited by 9 publications

(9 citation statements)

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“…Jessu and Spearing [19] simulated pillars at five different inclinations of 0 • , 10 • , 20 • , 30 • , and 40 • with four different width-to-height ratios. It was concluded that the pillar strength increased with the increase of the width-to-height ratio at all the inclinations of the pillars, as shown in Figure 11.…”

Section: Numerical Modellingmentioning

confidence: 99%

“…It was concluded that the pillar strength increased with the increase of the width-to-height ratio at all the inclinations of the pillars, as shown in Figure 11. The results presented in Jessu and Spearing [19] for the numerical modelling of horizontal and inclined pillars were analysed further to determine the strength reduction factors. Table 4.…”

Section: Joint Dilation 0°mentioning

confidence: 99%

“…Two-dimensional finite-element numerical studies were conducted to evaluate the strength of hard-rock pillars under far-field principal stresses at different orientations, and it was concluded that the strength of the pillars with higher W/H ratios was highly affected by the orientation of the pillars [17,18]. Jessu and Spearing [19] conducted similar numerical studies to that of Suorineni [18] but with a finite difference code in a three-dimensional model to evaluate the strength and the failure mechanisms of pillars at different inclinations. It was concluded that, as the inclination increases, the pillars with higher W/H ratios have a significantly lower strength than the horizontal pillars.…”

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confidence: 99%

“…The failure mechanisms were evaluated at the laboratory scale and were related to the cause of strength reduction. The results of the numerical modelling of pillars presented by Jessu and Spearing [19] were further evaluated to describe the strength reduction factors.…”

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confidence: 99%

“…(a) Calibration chart for numerical models and theoretical models. (b) Pillar strength versus W/H ratios in normal and inclined loading conditions[19].…”

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Laboratory and Numerical Investigation on Strength Performance of Inclined Pillars

2018

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Pillars play a critical role in an underground mine, as an inadequate pillar design could lead to pillar failure, which may result in catastrophic damage, while an over-designed pillar would lead to ore loss, causing economic loss. Pillar design is dictated by the inclination of the ore body. Depending on the orientation of the pillars, loading can be axial (compression) in horizontal pillars and oblique (compression as well as shear loading) in inclined pillars. Empirical and numerical approaches are the two most commonly used methods for pillar design. Current empirical approaches are mostly based on horizontal pillars, and the inclination of the pillars in the dataset is not taken into consideration. Laboratory and numerical studies were conducted with different width-to-height ratios and at different inclinations to understand the reduction in strength due to inclined loading and to observe the failure mechanisms. The specimens’ strength reduced consistently over all the width-to-height ratios at a given inclination. The strength reduction factors for gypsum were found to be 0.78 and 0.56, and for sandstone were 0.71 and 0.43 at 10° and 20° inclinations, respectively. The strength reduction factors from numerical models were found to be 0.94 for 10° inclination, 0.87 for 20° inclination, 0.78 for 30° inclination, and 0.67 for 40° inclination, and a fitting equation was proposed for the strength reduction factor with respect to inclination. The achieved results could be used at preliminary design stages and can be verified during real mining practice.

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Section: Numerical Modellingmentioning

confidence: 99%

Section: Joint Dilation 0°mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

“…(a) Calibration chart for numerical models and theoretical models. (b) Pillar strength versus W/H ratios in normal and inclined loading conditions[19].…”

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confidence: 99%

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