Jhanwar, J. C. and Sangode, Anand and Verma, Chandrani P. and Kumbhakar, Subodh (2021) GEOTECHNICAL STUDY TO EVALUTE PIT SLOPE DESIGN OF AN LIMESTONE OPENCAST MINE- A CASE STUDY. Mining Engineers Journal , 22 (11). pp. 15-20. ISSN 0975-3001

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Abstract

This paper deals with a geotechnical study conducted at a mechanised limestone opencast mine attached to a cement plant in India. The study consists of comprehensive field investigations and detailed slope stability analysis to evaluate pit slope design, which can enable optimum mineral extraction while maintaining pit slope stability. The slope mass at this mine mainly consists of dolomite and limestone overlain by up to 40 m thick soil cover in some slope sections. The Rock Quality Designation across different rocks varies from 76 to 90, which signify very good rock quality. The Uni-axial compressive strength of limestone and dolomitic limestone varies in the ranges of 51 - 78 MPa and 81 - 112 MPa respectively, which signify Strong to Very Strong rocks. The limestone & dolomitic limestone are classified as good to very good rock mass based on Rock Mass Rating classification approach. Detailed stability analysis is carried out to evaluate optimum pit slope designs for different slope sections at this mine for an ultimate pit depth of 140 m. The recommended slope designs include overall pit slope angle, overall slope angles for rock slope and soil slope, bench width, bench height, ramp width and inter-ramp slope angle. Sensitivity analysis is carried out to study the relative influence of the change in cohesion and angle of internal friction on the factor of safety. Further, different remedial and control measures are suggested for implementation during the execution of recommended slope design for optimum mineral extraction along with pit slope stability.

Item Type:	Article
Subjects:	Blasting
Divisions:	UNSPECIFIED
Depositing User:	Mr. B. R. Panduranga
Date Deposited:	10 Oct 2025 11:58
Last Modified:	10 Oct 2025 11:58
URI:	https://cimfr.csircentral.net/id/eprint/2903

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