A New Blastability Index for Hard Roof Management in Blasting Gallery Method

详细信息    查看全文

• 作者：Chhangte Sawmliana (1)
  Pijush Pal Roy (1)
  
• 关键词：Blasting gallery ; Longwall mining ; Blastability Index ; Induced caving ; Cavability Index ; Rib ; pillar ; Adjustment factor ; Powder factor
• 刊名：Geotechnical and Geological Engineering
• 出版年：2012
• 出版时间：December 2012
• 年：2012
• 卷：30
• 期：6
• 页码：1357-1367
• 参考文献：1. Banerjee G, Ray AK, Singh GSP, Yadav KP (2001) Hard roof management—a key for high production in longwall coal mines. Technical Note (unpublished), p 13
  2. CIMFR S&T Report (GAP/30/MT/MOC/01 -02) (2003) Investigations to optimize blast design and charge loading parameters in coal for ringhole blasting and in stone for induced blasting in degree-I seams for blasting gallery method in underground mines of The Singareni Collieries Company Limited (SCCL) (Project leaders: P. Pal Roy and C. Sawmliana). Ministry of Coal. Government of India, New Delhi, p 89
  3. Choudhury M (2002) Pre-fracturing of roof rocks—a possible future strategy for successful longwall mining in India. Journal of Mines, Metals and Fuels 50(6):219-24
  4. Ghose AK (1988) Design of drilling and blasting system—a rock mass classification approach. Balkema, Mine Planning and Equipment Selection, pp 335-40
  5. Khera SC, Agarwal RK (1996) Hard roof management as tried in Datong Coalfield. The Indian Mining and Engineering Journal 35(1):31-4
  6. Lilly PA (1986) An empirical method of assessing rock mass blastability. Large open pit mining conference, Newman, pp 89-3
  7. Pal Roy P, Sawmliana C, Bhagat NK, Madhu M (2003) Induced caving by blasting: innovative experiments in blasting gallery panels of underground coal mining. Trans Inst Min Metall A (Mining Technology) 112:57-3 CrossRef
  8. Sawmliana C (2005) An investigation into blast design parameters for Ringhole blasting and induced blasting in blasting gallery method of underground coal mines. Ph.D. Thesis, Indian School of Mines, Dhanbad, November, p 320 (Unpublished)
  9. Sawmliana C, Pal Roy P, Murthy VMSR (2004) Induced Blasting—A future strategy for successful hard roof management in underground coal mines. In: Proceedings of the national seminar on rock fragmentation, 23-4 January, BHU, Varanasi, pp 139-44
  10. Scott A (1996) Blastability and blast design. Rock Fragmentation by Blasting—Fragblast 5. (ed. Bibhu Mohanty), Montreal, Canada, pp 27-6
  11. Seam MM, Dutta NL, Sharma UC (1988) Longhole blasting—a new technology for underground thick seam mining. In: Proceedings of the workshop on optimal coal wining in underground mines, CMPDIL, Ranchi, pp 20-8
  
• 作者单位：Chhangte Sawmliana (1)
  Pijush Pal Roy (1)
  
  1. Blasting Department, Central Institute of Mining and Fuel Research, Dhanbad, 826 015, Jharkhand, India
  
• ISSN：1573-1529

文摘

The presence of hard and massive sandstone above the coal seam in underground coal mines often leads to delay in caving of overlying rock beds thereby causing excessive load on supports and posing danger to underground workings. The problem is more prominent in blasting gallery (BG) as well as longwall mining methods in Indian coal mines. Induced caving by blasting is a promising means for hard roof management in underground coal mines. Based on extensive studies and data collected from different mines in India, a Blastability Index (BI) has been developed which can be used for the classification of roof according to the degree of ease in caving by induced blasting. Different charge factors have also been suggested based on the Blastability Index. Due to wide change in the method of extractions, ‘Cavability Index-for longwall panel was found ineffective in case of BG method of working as well as bord and pillar working. For this reason, this proposed Blastability Index would be of immense help for caving of hard roof by induced blasting.