The altitude, the extreme climate, as well as the geological conditions in the Himalayas were the challenges of this project. Within the tunnel area, rock comprised mainly schist and migmatite with expected disturbed zones and in some individual areas high squeezing the rock.
Encardio-rite was awarded an I&M sub-contract for complete monitoring solutions for the tunnelling works. Besides geotechnical monitoring during tunnelling, Encardio-rite also continuously conducted geophysical prediction by Tunnel Seismic Prediction System (TSP) ahead of tunnelling to enable early recognition of fault or fracture zones or zones where the rock mass characteristic changes. A geological prognosis was given that enabled the tunnel site management to determine necessary forthcoming tunnelling measures. Supply & installation of geotechnical sensors were provided along with tunnel seismic prediction, and weekly and monthly reporting with evaluation & interpretations. Multi-point extensometer, load cells, and Bi-reflective targets were used during the monitoring of the tunnel.