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Breaking Through Tough Ground in the Himalayas: Nepal’s First TBM

Years of hard work and planning have paid off at the Bheri Babai Diversion Multipurpose Project. This 12 km tunnel is not only breaking through a historically difficult mountain range, but it has also managed to break down the notion, to the people of Nepal, that drill and blast is this only way to excavate the extreme conditions in the Himalayas. This paper highlights the first TBM in Nepal and how it is managing to bore at an exceptional advance rate of over 700 m per month, with a high of 1202 m in one month. It examines which design features of the Double Shield TBM are contributing to the great excavation rates, and how the crew’s operational methods have maximized these results.

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