On Investigation Methods
Published on March 05 2011... the page will be worked out later ...
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Quotation
Important quotations will be presented here from time to time
Karl Terzaghi:
Even a very comprehensive and appropriately conducted geological survey of the site of a proposed tunnel cannot accomplish more than a very crude estimate of the length of the tunnel sections in which each of the principal types of rock conditions will be encountered. Further differentiation cannot be expected. Hence, even if methods for accurately computing the rock load under given rock conditions were available, they would have very little practical value on account of the inevitable uncertainties associated with predicting the rock conditions.