Underground mining of thick coal seams

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• 作者：Rakesh Kumar^a ; ^{kumarrakesh18@yahoo.com" class="auth_mail" title="E-mail the corresponding author} ; Arun Kumar Singh^a ; Arvind Kumar Mishra^b ; Rajendra Singh^a
• 关键词：Thick coal seam ; Single lift depillaring of total thickness (SLDTT) ; Extraction height ; Pillar instability ; Caving of coal
• 刊名：International Journal of Mining Science and Technology
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：25
• 期：6
• 页码：885-896
• 全文大小：3563 K

文摘

This paper reviews underground mining methods for total thickness of a thick coal seam in single lift (TTTCSSL). Review shows the required engineering for extraction of thick seams needs to be fitted with thickness of the seam, behavior of rock-mass and surrounding stress conditions for efficient mining. Variants of TTTCSSL are able to extract a maximum 10–12 m thickness only. An improvement in bending moment of the overlying coal band in longwall top coal caving (LTCC) provides better under-winning opportunity for the roof coal band. An acceptable limit of 25 MPa compressive strength of coal for the success of LTCC may be increased under favorable geo-technical conditions. Bord and pillar in India adopted induced caving of roof coal band for single lift depillaring of total thickness (SLDTT) of a competent thick coal seam developed along floor. Case studies are given to arrest the adverse effects of extraction height on pillars.