Determination of the Stability of pit slope of the Opencast Coal Mines Workings by Underground Mining
Authors
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Research Scholar, Indian Institute of Technology, Indian School of Mines, Dhanbad, Jharkhand-826004 ,IN
Gopal Rajak -
Assistant Professor, Indian Institute of Technology, Indian School of Mines, Dhanbad, Jharkhand-826004 ,INHemant Kumar
DOI:
https://doi.org/10.18311/jmmf/2023/33713Keywords:
Opencast mining, Development, Numerical Modelling, Coal mining, Pit SlopeAbstract
Long back, underground mining was continued in the shallow depth. Huge quantities of coal were lost due to the improper method and unavailability of the types of machinery. The technological evaluation is again a big change with a higher stripping ratio, and opencast mining has played a significant role in the coal extraction in the greater depth. The pillar left in the shallow depth underground mining again has been taken out by opencast mining. This paper examines the effect of developed underground workings on the stability of the opencast slope. It compares the various parameters like critical Strength Reduction Factor (SRF), total displacement and maximum shear strain. The study shows that the safety of the slope made on standing pillars/developed galleries is less than a slope made on virgin strata. Hence, the mining engineers need to account for the reduction in factor of safety and plan the slope angle accordingly. Every parameter, such as overall slope angle, depth of underground workings, internal angle of friction, the width of gallery and pillars of underground workings,have a significant role in determining the factor of safety. In a parametric study, the critically dependent parameter is examined with regression analysis to calculate the safety factor in such cases. This paper may help to decide the bench height and slope angle in the opencast mining.
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