Electronic Resource
Application of multi-slicing highwall mining system with stowing at surface coal mine in Thailand.
| العنوان: | Application of multi-slicing highwall mining system with stowing at surface coal mine in Thailand. |
|---|---|
| المؤلفون: | Hamanaka A., Mine planning and equipment selection, MPES 2010 Fremantle, Western Australia 01-Dec-1003-Dec-10, Laowattanabandit P., Matsui K., Meechumna P., Sasaoka T., Shimada H., Takamoto H. |
| بيانات النشر: | Carlton, Victoria Australasian Institute of Mining and Metallurgy 2010 |
| نوع الوثيقة: | Electronic Resource |
| مستخلص: | The Mae Moh open-cut mine produces about 16 000 000 tpa of lignite for the generation of 2 400 MW of electricity. A large pit slope is formed with the progression of mining but massive slides in the pit slope often occur due to the existence of weak planes such as faults and bedding and the weak mechanical properties of the rocks, and 200-300 m rock block boundaries including coal seams are left in front of faults to prevent slides and maintain the stability of the pit slope. As a result there are significant coal reserves beneath the abandoned area along the pit slope and the mined coal seams are 15-30 m thick. Numerical analysis using the finite element code Phase2 was employed to investigate the application of a multi-slicing highwall mining system with stowing to the very thick coal seam left around large pit slopes. The Mohr-Coulomb criterion was employed as a failure criterion. The components of the stowing material were fly ash, cement and waste rocks. The application of a single slice highwall mining system with and without stowing was first investigated. Without the stowing system the openings showed less stability and the pillars failed with severe shear failure as the strength factor decreased and failure zones developed around the openings. The stability of the openings and pillars improved significantly with a stowing system so that the slope stability could be maintained and coal recovery increased. The applicability of a multi-slice system was then studied in relation to the effect of the spacing of each slice and of the arrangement of the openings using a stowing system. The stability of openings and pillars increased with increasing spacing. If the spacing between each slice was larger than 2 m there was no obvious impact of the spacing on the stability of openings and pillars. The use of openings and pillars in a staggered pattern was more stable than that for a square one. The Mae Moh open-cut mine produces about 16 000 000 tpa of lignite for the generation of 2 400 MW of electricity. A large pit slope is formed with the progression of mining but massive slides in the pit slope often occur due to the existence of weak planes such as faults and bedding and the weak mechanical properties of the rocks, and 200-300 m rock block boundaries including coal seams are left in front of faults to prevent slides and maintain the stability of the pit slope. As a result there are significant coal reserves beneath the abandoned area along the pit slope and the mined coal seams are 15-30 m thick. Numerical analysis using the finite element code Phase2 was employed to investigate the application of a multi-slicing highwall mining system with stowing to the very thick coal seam left around large pit slopes. The Mohr-Coulomb criterion was employed as a failure criterion. The components of the stowing material were fly ash, cement and waste rocks. The application of a single slice highwall mining system with and without stowing was first investigated. Without the stowing system the openings showed less stability and the pillars failed with severe shear failure as the strength factor decreased and failure zones developed around the openings. The stability of the openings and pillars improved significantly with a stowing system so that the slope stability could be maintained and coal recovery increased. The applicability of a multi-slice system was then studied in relation to the effect of the spacing of each slice and of the arrangement of the openings using a stowing system. The stability of openings and pillars increased with increasing spacing. If the spacing between each slice was larger than 2 m there was no obvious impact of the spacing on the stability of openings and pillars. The use of openings and pillars in a staggered pattern was more stable than that for a square one. |
| مصطلحات الفهرس: | BACKFILLING, COMPUTING, FAILURE, FAULTS, FINITE ELEMENT ANALYSIS, HIGHWALLS, LIGNITE, MAE MOH, MINING, MODELLING, OPEN CAST MINING, PILLARS, SLOPE STABILITY, THAILAND, text |
| URL: | E Topal and M Kuruppu, edsMine planning and equipment selection, MPES 2010 |
| الاتاحة: | Open access content. Open access content |
| ملاحظة: | und |
| Other Numbers: | UKMMM oai:icon.iom3.org:107062 URN:ISBN:978 1 921522 35 2 1309235326 |
| المصدر المساهم: | INSTITUTE OF MATS MINERALS & MINING From OAIster®, provided by the OCLC Cooperative. |
| رقم الانضمام: | edsoai.on1309235326 |
| قاعدة البيانات: | OAIster |
| الوصف غير متاح. |