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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Prediction of rock load emphasizing excavation damage of in situ rocks caused by blasting in coal mines
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Prediction of rock load emphasizing excavation damage of in situ rocks caused by blasting in coal mines

机译：煤矿爆破引起原位岩石挖掘损伤的岩石负荷预测

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Roof failure in coal mines is strongly related to the frequency of laminations and their movement when the load acts upon them. Detachment of roof bolts from mine roof due to improper estimation of extent of weak zone is one of the major problems in underground coal mines, thus affecting the safety and productivity of workings. The most popular and practised method for roof support design in Indian coal mines is the Central Mining Research Institute-ISM geomechanical classification system. Irrespective of such an established system of support design, accidents due to roof fall still persist. Here we review various available classification systems for rock load estimation and identify their limitations. The study has been extended taking into consideration the case study of KTK-6 incline of Singareni Collieries Company Limited by proposing a modified rock mass classification system based on seismic wave velocity as a key descriptor. A modified rock mass rating (RMR) system (RMRdyn) with inclusion of seismic velocity as one of the parameters is proposed for the estimation of rock load. Enhancement in rock load by 20% has been found for RMRCMRI-ISM values less than 40 according to the new rock load relation. This resulted in under-supporting of the roof and thus might have caused failures. For cases with RMRCMRI-ISM values more than 60, the earlier equation overestimates rock load by about 25% resulting in over-supporting. Thus, estimation of rock load from the proposed new equation appears to be more rational as it takes into account the actual damage zone.
机译：煤矿的屋顶衰竭与叠片频率强烈有关，当负载作用在它们上时，它们的运动频率都是强烈的。由于弱区内的范围不当估算，从矿井屋顶的拆卸是地下煤矿的主要问题之一，从而影响了工作的安全性和生产力。印度煤矿屋顶支撑设计最受欢迎和实践的方法是中央采矿研究所 - ISM地质力学分类系统。无论如此建立的支持设计系统，屋顶由于屋顶的事故仍然存在。在这里，我们审查了各种可用的岩石负荷估计分类系统，并确定其限制。考虑到这项研究延长了对Singareni Collieries Company Limited的KTK-6倾斜，通过提出基于地震波速作为关键描述符的改进的岩石质量分类系统。提出了一种改进的岩石质量额定值（RMR）系统（RMRDYN）作为作为其中一个参数之一的地震速度的速度升值。根据新的岩石负载关系，针对RMRCMRI-ISM值的RMRCMRI-ISM值，RMRCMRI-ISM值的增强率为20％。这导致屋顶的低于支撑，因此可能导致失败。对于RMRCMRI-ISM值超过60的情况，早期的等式高估岩石负荷约25％，导致过度支持。因此，来自所提出的新方程的岩石负荷的估计似乎更合理，因为它考虑了实际损伤区。

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