Hydraulic Transients in Rock‐Bored Tunnels
Publication: Journal of Hydraulic Engineering
Volume 116, Issue 2
Abstract
The nature of hydraulic transients in rock‐bored tunnels is expected to be frequency‐dependent. Three issues related to the frequency dependence are addressed in this paper. A complex‐valued and frequency‐dependent wave speed in a rock‐bored tunnel filled with water is formulated with consideration of the dynamic effect of the rock mass surrounding the tunnel, and its physical meaning is defined. The theory of hydraulic resonance in pipelines is extended to tunnels with frequency‐dependent wave speeds. Results show significant changes in resonant conditions, illustrate dramatic reductions in response at practical frequencies, and confirm the low probability of the occurrence of high‐frequency resonances in long tunnels. A variation in the impulse response method is applied for transient analysis. It is found that pressure waves propagating in tunnels are subject to dispersion and attenuation, and the complex wave speed may alter a transient to some extent, depending on the frequency spectrum of the transient.
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Information & Authors
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Published In
Journal of Hydraulic Engineering
Volume 116 • Issue 2 • February 1990
Pages: 196 - 210
Copyright
Copyright © 1990 ASCE.
History
Published online: Feb 1, 1990
Published in print: Feb 1990
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