This review highlights the contribution of Oda et al.'s works in offering a new perspective on the depth-dependent permeability of discontinuous rock masses. By integrating Oda's permeability tensor theory with the fracture closure model proposed by Bianchi and Snow, they derived a closed-form expression for a stress-dependent permeability tensor. The formulation is practically applicable, as all parameters can be determined directly from conventional field survey data. The validity of the model has been verified through comparisons with in-situ measurements conducted in Japan, Sweden, the United States, and Canada. This approach offers a valuable framework for designing site investigations in future and for the preliminary interpretation of field results. To support this understanding, the present paper reviews a series of studies by Oda et al. concerning the theoretical development and engineering application of stress-dependent permeability models for discontinuous rock masses.

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