Abstract
Engineering and scientific problems confronted in hydroelectric energy exploitation and construction are discussed, and the concept and key problems in engineering geomechanics are introduced. The research work by the team of the authors in recent years is reviewed and research interests in relevant scientific fields are proposed, which includes: (1) The theory of "failure on a point" in traditional solid mechanics is inadequate to describe geological body, and the concept of "fracture degree" is proposed, rationality as well as the operation method with field monitoring and numerical simulation are discussed. (2) Two disaster prevention concepts in geologic hazards based on fracture evolution are introduced, rationality of state evaluation and importance of numerical simulation are emphasized. (3) Evaluation criteria of stability analysis for geological body are discussed and comments are made for some of the common methods. (4) Two scale mechanical model and computational frame for numerical simulation of discontinuum and heterogeneity in geological body are presented. (5) Distributive function of strain strength in representative volume element are expounded, which is more appropriate to describe fracture of material than traditional constitutive relationship and parameters. (6) Seepage model for fractured porous media and fracture coupled model are reviewed. (7) According to secondary geological disaster in Wenchuan, irrationality of pseudo-static method is pointed out, and a new method with numerical simulation for stability analysis of geological body subjected to seismic loads is introduced.
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