Abstract
The open-cracks in large rock mass play an important role in flowing ground water. The main purpose of this paper is to present the method used to estimate the permeability coefficient of natural open-crack from the distribution of its opening width.
We studied on this problem by following procedures.
(1) The numerical method to describe the approximate flow behaviors in open crack was introduced on the basis of Poiseuille law.
(2) Some permeability coefficients of natural open-cracks were calculated from these distributions of opening width by this method.
(3) These calculated values were compared with the values measured by the permeability test apparatus respectively.
As the result, it was found that the permeability coefficient of natural open-crack can be well estimated by this numerical method.
