Laboratory and Numerical Investigation on Strength Performance of Inclined Pillars
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. Depend...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-11-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/11/11/3229 |
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| author | Kashi Vishwanath Jessu Anthony J. S. Spearing Mostafa Sharifzadeh |
| author_facet | Kashi Vishwanath Jessu Anthony J. S. Spearing Mostafa Sharifzadeh |
| author_sort | Kashi Vishwanath Jessu |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-14T01:53:56Z |
| format | Article |
| id | doaj.art-f874d97b904d4cd29cfd61530f346072 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-14T01:53:56Z |
| publishDate | 2018-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-f874d97b904d4cd29cfd61530f3460722022-12-22T02:19:13ZengMDPI AGEnergies1996-10732018-11-011111322910.3390/en11113229en11113229Laboratory and Numerical Investigation on Strength Performance of Inclined PillarsKashi Vishwanath Jessu0Anthony J. S. Spearing1Mostafa Sharifzadeh2Western Australian School of Mines, Curtin University, Kalgoorlie 6430, AustraliaWestern Australian School of Mines, Curtin University, Kalgoorlie 6430, AustraliaWestern Australian School of Mines, Curtin University, Kalgoorlie 6430, AustraliaPillars 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.https://www.mdpi.com/1996-1073/11/11/3229pillarsinclinationoblique loadingwidth-to-height ratiostrength reduction factors |
| spellingShingle | Kashi Vishwanath Jessu Anthony J. S. Spearing Mostafa Sharifzadeh Laboratory and Numerical Investigation on Strength Performance of Inclined Pillars Energies pillars inclination oblique loading width-to-height ratio strength reduction factors |
| title | Laboratory and Numerical Investigation on Strength Performance of Inclined Pillars |
| title_full | Laboratory and Numerical Investigation on Strength Performance of Inclined Pillars |
| title_fullStr | Laboratory and Numerical Investigation on Strength Performance of Inclined Pillars |
| title_full_unstemmed | Laboratory and Numerical Investigation on Strength Performance of Inclined Pillars |
| title_short | Laboratory and Numerical Investigation on Strength Performance of Inclined Pillars |
| title_sort | laboratory and numerical investigation on strength performance of inclined pillars |
| topic | pillars inclination oblique loading width-to-height ratio strength reduction factors |
| url | https://www.mdpi.com/1996-1073/11/11/3229 |
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