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Published on: November 20, 2014
Confined flow into a tunnel during progressive drilling: an analytical solution
1Centre of Hydrogeology, University of Neuchâtel, Switzerland. pierre.perrochet@unine.ch
Abstract:
A convolution integral is developed to evaluate transient, drilling speed-dependent discharge rates into a tunnel gradually excavated in a homogeneous infinite aquifer. Comparison with the classical instantaneous-drilling evaluation commonly used in practice reveals drastically reduced early-time discharge rates, higher maximum rates, and similar long-term rates. Dimensionless-type curves are provided to help assess total discharge sensitivity to drilling time and predict safer maximum flow rates.
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