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首页> 外文期刊>Journal of Mines, Metals & Fuels >Extraction at higher depth of cover: retrospection of geotechnical problems and recent case study
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Extraction at higher depth of cover: retrospection of geotechnical problems and recent case study

机译：较高覆盖深度的提取：岩土工程问题的回顾与最新案例研究

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Understandably at greater depth 360m or beyond, the pillar w/h (width-to-height) ratios exceed the dimension for which the most widely known strength equations (in Indian mining condition, the CMRI pillar strength equation) were derived. Indian Coal Mines Regulations, 1957 suggests a minimum size 48m X 48m, centre-to-centre for depth of cover more than 360m. It is however pertinent to know the optimum dimension of a pillar in such situation. Although with large w/h (for "squat" pillars), researchers worldwide agree that the probability of pillar failure and loss of strength decreases. However, the determination of strength of such pillars is still a challenge and needs further research, field trials with a suite of geotechnical instruments and confidence-building measures. As detailed in this paper, stability of mine entries, rather than that of the pillars and assessment of geotechnical problems in right perspectives need sincere consideration. Mitigative measures of geotechnical problems likely to be encountered in an Indian deepmost coal mine is also discussed in this paper. 'Mass production' underground technology using continuous miner with stowing is found to be a feasible method for the huge (good grade) coal deposits at higher depth. Chinakuri mine no.I, Eastern Coalfields Limited can become a leader, provided we are able to successfully implement the suggestions as given in this paper at shop-floor level pro-actively.
机译：可以理解的是，在360m或更大的深度处，立柱的w / h（宽高比）超过了推导最广为人知的强度方程（在印度采矿条件下为CMRI立柱强度方程）的尺寸。 1957年的《印度煤矿条例》建议最小尺寸为48m X 48m，从中心到中心的覆盖深度超过360m。然而，在这种情况下知道支柱的最佳尺寸是有意义的。尽管w / h较大（用于“下蹲”支柱），但全世界的研究人员都认为支柱失效和强度损失的可能性会降低。但是，确定这些支柱的强度仍然是一个挑战，需要进一步研究，使用一系列岩土工具进行现场试验和建立信任措施。如本文所详述，需要真诚地考虑矿井入口的稳定性，而不是支柱的稳定性以及从正确的角度评估岩土工程问题。本文还讨论了在印度最深煤矿可能遇到的岩土工程问题的缓解措施。使用连续采矿机进行埋入的“批量生产”地下技术被发现是一种用于深部巨大（优质）煤层的可行方法。只要我们能够积极地在车间一级成功实施本文所提出的建议，东方煤田有限公司的Chinakuri一号矿就可以成为领导者。

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