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Naithani, Ajay K.
- RMR - A System for Characterizing Rock Mass Classification: A Case Study from Garhwal Himalaya, Uttarakhand
Authors
1 Department of Geology, Post Box No 86, H N B, Garhwal University, Srinagar (Garhwal) 246 174, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 4 (2007), Pagination: 627-640Abstract
In order to understand the importance of rockmass and its properties for stability analysis several classification methods are available. The rock mass rating (RMR) has been found to be quite useful due to the ease with which it can be practiced and based mainly on the collection of field data and strength parameters. This technique has been used earlier in many mining and engineering projects and found useful in an assessment of the slope stability condition and for mining plans and designing the structures RMR technique involves collection of data on rock strength, RQD (%) spacing of discontinuities, condition of discontinuities and groundwater conditions. Twelve sites selected on the basis of good exposures of the rock outcrops along the road section were studied using RMR approach. The results indicates that the rock mass of this area fall under the good fair and poor rock quality. The rock type viz mica schists and phyllites well exposed in the study area have lower RMR ratings, as they are more readily weathered and contain some weak planes and break along these planes. The analysis and evaluation should serve as a guide for engineering development projects in the area.Keywords
Rock Mass Rating, Discontinuities, Rock Quality Designation, Roughness, Garhwal Himalaya.- Glacier Morphometry: a Case Study of Gangotri Group of Glaciers, Garhwal Himalaya, India
Authors
1 Department of Geology, Post Box No. 86, H. N. B Garhwal University, Srinagar (Garhwal) - 246 174, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 61, No 3 (2003), Pagination: 325-334Abstract
The glaciers especially in the Himalaya, are believed to be gradually receding. The present geomorphological investigation confirms the continued overall recession of Gangotri glaciers in the last hundred years. Gangotri group of glaciers comprise the main trunk glacier, and its major tributaries, Chaturangi, Kirti etc. along with other minor tributaries, as well as the associated glaciers, like Raktavarna, Mem and Bhrigupanth etc.Various glacier morphometric parameters were calculated based on field observations and aided by a detailed study of the topographic maps and satellite imageries. Observed parameters are mainly, length, width and area of the glaciers, along with snout altitude, width of the snout etc. On the basis of these primary parameters, some secondary parameters like, relief ratio, elongation quotient and snout index were calculated and statistically analysed. The result shows that (a) the main trunk glacier is retreating, (b) almost all the tributary glaciers are advancing or retreating at a slower rate in comparison to the trunk glacier, but (c) The associated Bhrigupanth tributary is practically static. In this study, an attempt is being made to present a model for a retreating group of glaciers.
Keywords
Glaciers, Recession, Advancement, Morphometry, Gangotri, Garhwal Himalaya.- Geological and Geotechnical Investigations of Loharinag-Pala Hydroelectric Project, Garhwal Himalaya, Uttarakhand
Authors
1 National Institute of Rock Mechanics, Kolar Gold Fields - 563 117, IN
2 Water and Power Consultancy Services (I) Ltd., Gurgaon, IN
3 928, 22nd Main Road, IV T Block, Jayanagar, Bangalore - 560 041, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 73, No 6 (2009), Pagination: 821-836Abstract
The project area, forming a part of Bhagirathi valley, exposed rocks classed as central Himalayan crystallines and are medium to high grade metamorphics. The rock types exposed are feldspathic gneisses, quartz-biotite schists, garnet-biotite schist, biotite gneisses, migmatites and amphibolites. To design the rock support for the underground structures of desilting chambers, HRT, surge shaft, pressure shafts, power house, TRT and for the foundations of barrage and intake of desilting chambers, rock mass classifications was attempted following the methods of Bieniawski Rock Mass Rating (RMR) Classification and Tunnelling Quality Index (Q) of Barton et al. RMR technique involves collection of data on rock strength, RQD (%), spacing of discontinuities, condition of discontinuities and groundwater condition, while the 'Q' involves collection of data on RQD (%), joint set numbers (Jn), joint roughness number (Jr), joint alternation number (Ja), joint water reduction factor (Jw) and stress reduction factors (SRF). The permeability test in the overburden was done by the constant head method, while in the bed rock portion conducted by packer test. The result indicates that the rock masses of the area fall under the good, fair and poor rock quality. Augen gneiss of power house area is coming under the category of moderately strong rock as proved by deformability characteristics and strength parameter. On the basis of above study recommendations have been made for the proper and safe construction of the project components.Keywords
Hydroelectric, Rock Mass Classification, Tunnel Quality Index, Garhwal Himalaya, Uttarakhand.References
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- Investigation on the Impact of Cloudburst in Tehri District, Uttaranchal - 31 August 2001
Authors
1 Department of Geology, Post Box. No. 86, H.N.B. Garhwal University, Srinagar (Garhwal) 246 174, IN
2 GBP Institute of Himalayan Environment and Development, Garhwal Unit, Srinagar (Garhwal) 246 174, IN