Printed in Tunnelling Association Canada Conference, Vancouver, BC, 17-20 September 2006.

Estimation of Water inflow into a tunnel during construction

Ali Ameli, PhD, PEng, Geo Engineering Ltd. BC, Canada

ABSTRACT: This case study discusses a reliable, quick solution to evaluate the water ingress into the excavations, while the construction is in progress. The matter is reviewed for a 15 m diameter tunnel in sedimentary rocks in the vicinity of Karun River through enlarging the pilot tunnel. The water inflow inside the tunnel when excavated in full was estimated based on the amount of water discharge observed in the pilot. The approach did not need any further drilling or field permeability testing and eliminated the need for grouting. The predicted results were in harmony with the actual discharge level occurred in practice and relieved the management of facing with unpredicted situations.

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GeoEngineeringLtd 2006