Pages: 21-42

Abstract

Permeability is one the geotechnical parameters of the rock mass of dam sites, which threatens the stability of the dam site and wasting water stored behind the dam. In this study, using data from 28 exploratory boreholes in the Khersan 2 dam and using the inverse-square method (anisotropic method), the changes of permeability were evaluated. Lugeon test results and rockmass quality designation were used to study the permeability of the rock masses of the dam site. Furthermore, two and three-dimensional models were prepared using statistical and geostatistical analysis of the data. According to the studies and proposed models, the domain under study is suitable for dam construction in terms of permeability. However, according to the proposed model, operations of improvement are essential especially in some parts of the coast and the left abutment. Finally, some suggestions are presented to reduce the level of estimation error for future drilling in the region.