Study on Stability of Pillars in Coal Mines through Empirical Models

Abstract

Mining is the extraction of profitable minerals or other land materials from the earth, generally from a mineral body, vein or (coal) crease. Mining includes distinctive techniques like prospecting for metal bodies, dissecting the possibility of extraction, gainfulness of the operation, extraction of the sought materials. One of such systems is the Bord and Pillar system for mining which is one of the most established strategies for mining. The accomplishment of Bord and Pillar mining is selecting the ideal pillar size. In the event that the pillars are too expensive, then the extraction proportion abatements prompting less productivity and if the pillars are too little it jeopardizes the general mine wellbeing. Indian mines have around 60 % of the coal hindered as pillars. Geotechnical variables of an adjacent underground coal mine has been dead set in the research center. Distinctive methodologies of pillar configuration have been thought about. Variety of security element with width to stature proportion of pillar, extraction rate and profundity of spread has been dead set and conclusion has been made. The wellbeing and attainability of mining system is acquired through an ideal connection between security variable and extraction rate. This thesis contains the study of RK6 mine and GDK8 incline, the data collected from these mines and the results are found out to be 3.49MPa, 6.3MPa in RK6 and GDK8 respectively shows the maximum stress from Tributary area approach. Similarly 7.62MPa and 7.29MPa respectively for mine RK6 and GDK8 incline shows the maximum stress from Wilson’s approach. Wilson’s approach on stress over pillar shows maximum stress of. Strength of the pillars through six approaches indicated minimum strength of 11.17 MPa and 11.25 MPa in RK6 and GDK8 respectively. Safety factors are 2.11 and 2.3 for RK-6, and GDK 8 with variation of about 10% compared to the Tributary Area Approach. On the whole, pillars are stable with more than 1.5 safety factor for both of the mines conforming to the field observations