Abstract
Abstract Plain concrete lining is used in the construction of many power tunnels in rock masses having good and fair qualities under internal pressure ( p ). This type of concrete is susceptible to cracking and jointing as a result of the construction process. The average crack opening ( 2u ) is estimated to be approximately equal to (1 + ν) t(f t + p)/E , where E and ν are the modulus of deformation and Poisson's ratio of rock mass, respectively; and t and f t are, respectively, the thickness and ultimate tensile strength of the concrete lining. In order to ensure that the crack will close over time, this opening ( 2u ) should not be allowed to exceed a permissible limit. Case histories are included to obtain the permissible limits for crack opening and spacing.
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