Roof bolt failures in the mine generally occur due to the poor identification of the weak rock layers and considered as a major concern for underground coal mines in terms of its productivity and safety. The triggering factor responsible for underground roof failure is the presence of weak bedding planes and various geological discontinuities. Geological disruptions present in the mine roof seriously affect the continuity of the rock layers resulting in block failure. However, numerous improved methods have been suggested by a number of researchers but still, the upholding of the accidents due to roof fall is considered as a major challenge for underground mine workings. Thus, it is necessary to give proper emphasis on characterization of the roof fall so that stability of the mine workings could be increased and movement of the weak and layered strata can be arrested by applying an adequate roof bolting system. This mechanism of roof support gives the composite binding between the rock layers by restricting the roof fall. The stability of mine workings can be also increased by proper application of rock mass classifications system and adequate design of support system and finally, by extensive simulation methods and statistical methods like FLAC 3D numerical and statistical modelling to ascertain the stability of the workings. CMRI-ISM RMR (Central Mining Research Institute — Indian School of Mines Rock Mass Rating System) classification system is the most popular and practiced method for roof support design in Indian coal mines which is being successfully used from last several years for roof support design in Indian geo-mining conditions. This forms the basis to estimate the rock load and support design. In this paper attempt has been made to assess the stability of workings and pillars below the railway track by using empirical and numerical approach. After both the studies it can be said that, the galleries and pillars underlying the railways track are stable, as factor of safety in each case is more than 2. Later on, the study was also extended to see the effects of subsidence on the surface which reveals that, there shall be no such effect on the surface due to underground workings as the value of NEW (non-effective width) is less than 0.4 for both the cases.

中文翻译：

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CMRI-ISM RMR在Ballarpur地下煤矿开发工作稳定性分析中的应用——一种经验和数值方法

矿井顶板锚杆失效通常是由于对薄弱岩层识别不善，被认为是地下煤矿在其生产力和安全性方面的主要问题。地下顶板失效的触发因素是弱层理面和各种地质不连续性的存在。存在于矿顶的地质破坏严重影响了岩层的连续性，从而导致块体失效。然而，许多研究人员已经提出了许多改进的方法，但仍然认为顶板坠落事故的维持被认为是地下矿山作业的主要挑战。因此，有必要适当强调顶板下落的特征，以便通过应用适当的顶板锚杆系统来增加矿山作业的稳定性并阻止薄弱和分层地层的运动。这种顶板支撑机制通过限制顶板下落，在岩层之间形成复合结合。通过适当应用岩体分类系统和适当设计支护系统，最后通过广泛的模拟方法和统计方法（如 FLAC 3D 数值和统计建模）来确定工作的稳定性，也可以提高矿山工作的稳定性。CMRI-ISM RMR（中央矿业研究所——印度矿业学院岩石质量评级系统）分类系统是印度煤矿最流行和最实用的顶板支护设计方法，从过去几年开始成功地用于顶板支护设计。印度地质开采条件。这构成了估算岩石载荷和支护设计的基础。在本文中，尝试使用经验和数值方法评估铁路轨道下方的工作和支柱的稳定性。经过这两项研究，可以说铁路轨道下方的廊道和支柱是稳定的，因为每种情况下的安全系数都在2以上。 后来，该研究还扩展到了地表下沉的影响这表明，