A geomechanical, model is proposed for estimating the settlement of long dams on discontinuous, rock masses. It is shown. that orthogonally discontinuous rock masses can be analyzed as orthotropic media, and a discussion is included on evaluating the properties for the rock materials and the discontinuities. Settlements are evaluated with solutions for strip loads on orthotropic media, with appropriate corrections for varying dip of the principally planes of orthotropy. Example computations are included.

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