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TAI Journal (A Half Yearly Technical Journal of Indian Chapter of TAI)
Year : 2018, Volume : 7, Issue : 1
First page : ( 14) Last page : ( 20)
Print ISSN : 2277-2820. Online ISSN : 2278-4713.

Advancement in Geophysical Investigations for Tunnels

Dr. Rana Sanjay

PARSAN Overseas (P) Limited, India

Online published on 18 January, 2018.

Abstract

Modern major construction is inconceivable without high-level engineering explorations, which play a major role in increasing the economic efficiency of capital investments. For the design of structures it is indispensable to procure comprehensive high-quality information about the subsurface, within very short periods. The study of diverse natural conditions predetermines a variety of methods and technical means which can be used for carrying out exploratory work.

Most of the time, while working on tunnels, caverns and other underground projects, decision makers are working with limited and imperfect information. Engineering geophysics is an efficient means of subsurface investigation to fill in the information gaps and provide a complimentary source of information to enhance our understanding of subsurface conditions. The merit of application of this low cost aid lies in its ease of deployment and rapidity in providing a reliable knowledge of the underground over a large area, substantiating the requisite geotechnical evaluation studies thereby. Technological advancements and development of portable digital data acquisition instrument systems have increased the versatility in evaluating underground conditions and site characterization. The state-of-the-art subsurface geophysical investigations are helpful towards minimizing & optimizing involvement of the conventional direct exploration methods, aiding in accelerated and economical development of the underground construction projects. The investigations also play a key role in quality checks of construction and non-destructive health checks during entire life cycle of tunnels, caverns and other underground projects.

The present paper aims at presenting various possible applications for geophysical techniques for investigations in planning, pre-construction, construction and maintenance stages of underground projects. The paper also presents various advancements made in geophysical investigations.

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