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Himachal project – 5,000 metres up in the high passes of India

The NHIDCL (National Highways and Infrastructure Development Corporation) is a fully-owned company of the Ministry of Road Transport & Highways, Government of India.

It has appointed Soiltech through the consultancy of Rites-GC for carrying out geotechnical investigation works for the development of a highway tunnel in the state of Himachal Pradesh. The project is located on a pass which is at about 5,000 metres altitude above MSL. The boreholes drilled and logged were at an elevation of 4,651 metres.

The scope of work consisted of drilling and carrying out Borehole Resistivity Survey, Borehole Thermal Survey and Deviation measurement in deep boreholes, and in-situ stress measurement for which High Resolution Optical Televiewer (Hi-OPTV) and hydraulic fracturing was applied. Additionally, a Gamma log was collected in dry boreholes.

The work was carried out at about -20 degrees Celsius temperatures over a period of one week.

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