Abstract:
A geomechanical model test is an important method to study the global stability and the safety of a foundation and its superstructure since the test can truly simulate a complicated geologic structure and intuitively reflect its failure process. Not only the deformation and strength of jointed rock, but also the discontinuous structural surface, a dam structure and foundation reinforcement measures can be modeled by block masonry technique. This technique is applied to the geomechanical model test of Dagangshan arch dam with foundation reinforcement measures and an overload failure test is conducted by loading, measuring and monitoring systems. The stress and displacement distribution of the dam body are obtained. The failure mechanism and process of the abutment and dam body are explored. The global stalibily of Dagangshan arch dam is evaluated by three characteriastic overload factors, namely
K1 (the safety factor when crack initiation),
K2 (the safety factor for large nonlinear deformation) and
K3 (the safety factor for ultimate load). The comparative analysis with other high arch dam tests indicates that the global stability of Dagangshan is comparatively high. The comparision with the geomechanical model test of Dagangshan without foundation reinforcement measures shows that the reinforcement is effective.