水利水电流体力学外文翻译外文文献英文文献混凝土重力坝基础流体力学行为分析

水利水电流体力学外文翻译外文文献英文文献混凝土重力坝基础流体力学行为分析内容摘要：

an interactive system whose behavior is controlled by the mechanical and hydraulic properties of concrete materials and rock foundations. About a century ago, the failure of Boozy Dam prompted dam engineers to start considering the effect of uplift pressures generated by seepage within the dam–foundation system and to explore ways to minimize its effect.. Today, with modern putational resources and much more precedent, it is still most challenging to determine the porepressure distribution along foundation discontinuities to assess pertinent stresses and evaluate factors of safety. It is our opinion that observing and monitoring the behavior of large dams on well mapped and adequately instrumented foundations can bring important insights for a better understanding of factors controlling joint opening, crack propagation, and porepressure development in foundations of concrete gravity dams. behavior of natural joints :(a) mechanical。 (b)hydraulic. This paper presents behavior representative of cycles of reservoir operation in the last 20 years collected from monitored data of Albigna Dam, Switzerland, and also describes the results of a series of numerical analyses carried out to assess the hydromechanical behavior of its foundations. Comparisons are made between results of numerical modeling and the actual behavior monitored in the field. Based on these parisons, a series of conclusions are drawn regarding basic porepressure buildup mechanisms in jointed rock masses with implications that may be considered in other engineering projects, where the hydromechanical behavior of jointed rock should be considered. Such projects include pressure tunnels, hazardous waste disposal, and other situations dependent on geologic containment controlled by flow behavior along rock discontinuities. Hydromechanical behavior of natural joints A brief summary of the stateoftheart of mechanical and hydraulic behavior of individual rock joints is presented here. A more detailed description of rock joint Hydromechanical behavior can be found in Alvarez(1997)and Alvarez et al.(1995)and in investigations in laboratory and numerical model simulations carried out by Raven and Gale (1985), Gentier (1987),Esaki et al.(1992),and others. The mechanical behavior of the joint can be represented by a nonlinear hyperbolic relationship between the applied effective normal stress, 39。 n ， and joint closure, nV During loading, significant joint closure takes place at low effective normal stresses. The magnitude of the closure per unit of stre。