Informatics Publishing Limited

V. B. Prasad ¹, P. L. Zutshi ²

Affiliations
1 Geology Section, ONGC, 4th Floor, Avani Bhavan, Chandkheda Campus, Ahmedabad - 380 005, IN
2 "Vidhata", 1, Prem Kala Vihar, Panditwari, Dehra Dun, IN

Abstract

This study pertains to subsurface interpretation of thrust belt area of Jawalamukhi in Himachal Pradesh. Stratigraphy and seismic data with the drilled well information has been collated for correlation and interpretation. The known stratigraphic sequences of Meso-Proterozoic, Lower Dharmsala, Upper Dharmsala and Siwahk have been rendered into subsurface mappable seismic units. Subathu has not been recognized in subsurface in the area under study. Isochron map of each unit is presented. The structural features brought out north of Jawalamukhi and Lambagraon are indicative of syntectonism. Tectonic model of the "thrust belt" is brought out for Jawalamukhi, Johr and Drang thrusts in time domain. A pioneering effort in seismic data interpretation in a thrust belt area in the Himalayan Belt involving the synthesis of surface geology and subsurface seismic data is presented.

Keywords

Jawalamukhi, Seismic Data, Siwaliks, Dharmsala, Meso-Proterozoic, Thrusts, Stratigraphy And Tectonics, Himachal Pradesh.

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N. Visvanathan , V. B. Prasad , Ratish Kumar ¹

Affiliations
1 N. H. P. C. LTD, IN

Abstract

India's major Hydro potential is situated in deep Himalayas. The accessibility of these hydro sites is very tough. Before the start of actual construction of the project, it necessitates construction of roads and other infrastructure in the hilty terrain, which has its own limitations. Since the hydroelectric projects are tailor made suiting to the site conditions and head available for power generation, the size of equipment to be installed is to be decided on roads, bridge conditions and actual accessibility to the site in addition to water availability. This involves decision on fabrication o f the various components into small segments and requires them to be welded at site and thus involves huge welding work during erection of E&M equipment at project site. The Himalayan rivers carry huge amount of silt in the water as it is of the order of approximately 15,000 ppm in rainy season. More than 80% of silt consists of quartz particles which have the hardness of the order o f seven on Mohr's scale and it causes enormous damage to the undenA/ater parts which require to be rehabilitated every year by way of welding, grinding etc. This paper outlines the salient features of hydroelectric projects, utilization of welding technology during erection and operation, maintenance of E&M equipment in hydro-electric projects.

Keywords

Normal Features of Hydroelectric Project, E&M Equipment, Welding Techniques/Procedure & Testing, Utilization of Welding During Erection, Utilization of Welding Techniques During O&M.

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