The earthquake catalogue of the Kerala State indicates that the central part of the state (Wadakkancheri-Trissur and Idukki-Kottayam-Pala) is witnessing repeated seismicity. Though lineaments of all directions are identified in Kerala, some NW-SE trending structures are identified as neotectonically active and some of these NW-SE trending structures are even the source of recent seismicity. Some of the fault related geological studies in Peninsular India (Wadakkancheri, Periyar and Thenmala faults) identified that the region is responding to compressive tectonic regime. The slickensides from these faults indicate the recent movements are consistent with the present tectonic stress regime. Though the geological observations and seismological data indicate northeast directed stress regime, the in-situ stress measurement carried out at northern side of the study area shows local perturbation in maximum horizontal stress. Analysis of available seismic data of the region suggest that the seismic source at Idukki-Pala is indicating some recurrence pattern for moderate earthquakes and are spatially located close to the southeastern end of Periyar fault. The seismicity in the Wadakkancheri-Trissur, on the other hand, falls in the northwestern end of Periyar fault. It is also to be noted that the earthquakes in central Kerala were occurring as doublets. Thus, the estimation of earthquake potential of these regions through a proper integration of different disciplines and techniques is the need of the hour.
Abstract-In this paper the stability analysis of an open pit slope of chromite mine in Odisha state, India has been evaluated with a present working depth of 147 m with 280 overall slope angle to deepening the pit to 182 m under critical geometrical conditions like limitation of area, and having two active internal dumps with a distance of 25 m from pit in north and south directions. The mine having 19 benches with a height and width of 8 m each, and the bench angle is less than 800 from horizontal. Open pit slope stability analysis has been performed using FLAC/SLOPE of numerical modeling technique. Thus by studying the factor of safety, the stability analysis of pit slope has been evaluated and suggestions based on the geotechnical studies and numerical analysis has been presented.
Abstract-A methodology was formulated for grading the quarries. To grade the quarry in terms of quality, the geological-cum-geotechnical characteristics of the rock mass and physico-mechanical properties were mainly considered. The point load test and rebound hardness using Schmidt hammer were used to estimate the in-situ uniaxial strength of the rock mass. Representative blocks of samples were taken from each quarry for laboratory studies to determine their critical properties as dimensional stone. The grading guidelines for recoverable volume are as Grade -A Blocks of Uniform Colour and without defects, Grade -B Blocks with uniform colour and <10% natural defects/m3, Grade -C Blocks with distributed colour with 11%-30% natural defects/m3 and Grade -D Blocks with distributed colour and >30% natural defects/m3Case studies were taken up in four different dimensional stone granite quarries. The quarries were initially assessed for their overall recovery and from the estimated recovery, the percentage of various grades were projected. Based on the grading principle, the overall recovery is found to be 16% (A-12%, B-32%, C-38%, D-19%), 18% (A-4%, B-25%, C-41%, D-30%), 26% (A-5%, B-39%, C-32%, D-24%) and 21% (A-4%, B-39%, C-33%, D-24%) respectively. The projected recoveries and grading can be adopted at 90% confidence level.
MOIL Ltd. (formerly Manganese ore India limited) operates 10 mines. Out of this 7 mines are underground. Chikla mine is one of the underground mines. The mining method employed here is horizontal cut & Fill. The present paper describes the studies conducted to optimize the stoping parameters for better safety and productivity at Chikla mine. Support requirements for the proposed stope block between Ch-2365 and Ch-2425 from level 3 to level 2 is evaluated through the empirical methods and the stability of the crown pillar and the support behaviour is studied with numerical modeling. It was found that the wall rocks and the ore body have distinct strength properties and the rock mass falls in to good and fair categories. Two most popular rock mass classification systems were used for estimating the support requirements for the proposed stope block. A two dimensional finite deference code was used for numerical modeling. This paper presents the geotechnical parameters of the study area and the empirical support design and the numerical modeling results for the proposed stoping block at Chikla Mine.
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