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TAI Journal (A Half Yearly Technical Journal of Indian Chapter of TAI)
Year : 2018, Volume : 7, Issue : 1
First page : ( 5) Last page : ( 13)
Print ISSN : 2277-2820. Online ISSN : 2278-4713.

Challenges of Tunnelling in Himalayas

Dr. Goel R. K.

CSIR-Central Institute of Mining and Fuel Research Regional Research Centre, Roorkee

Online published on 18 January, 2018.

Abstract

A considerable amount of tunnelling has been going on in India for various projects such as hydroelectric power, irrigation, roads and railways. Most of these projects are located in Himalayas, far away from the urban areas. Tunnelling through weak and jointed rock masses such as in the Himalayas is a challenging task for the planners, designers, engineers and the geologists because of high overburden, thickly vegetated surface, weak, poor and fragile rocks and highly varying geology with the presence of numerous small and big shear zones, faults, etc. Due to these reasons, various tunnelling problems have been faced in the past and are still being encountered. Failures and the problems may be regarded as challenges and opportunities for generating new knowledge base and thereby increasing self-reliance in tunnelling. Some of the challenges of Himalayan tunnelling have been highlighted in the paper through weak and fragile rocks covering varying and mixed geology. Also the understanding on prediction of ground condition and tunnelling in squeezing ground condition have been briefly presented.

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Keywords

Weak and fragile rocks, mixed and layered rocks, Himalayan tunnelling, Ground condition, Squeezing.

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