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在高拱坝施工期和运行期,蓄水引起的边坡和地基变形是值得关注的问题。蓄水对岩体产生许多影响,包括岩体参数弱化、有效应力降低和浮托力的作用。这些现象与滑坡、坝体稳定和水库诱发地震等工程问题相关,而目前对蓄水作用的力学机制的研究仍十分有限。将边坡极限分析中的强度折减法扩展为同时考虑刚度和强度折减的有限元方法,并用于分析岩体材料的弱化。将裂隙岩体的有效应力原理应用到Drucker-Prager准则。基于锦屏一级拱坝左岸边坡变位和谷幅收缩的监测数据,将上述2种方法应用于蓄水期边坡及地基变形影响分析。结果表明,坝体具有良好的承受边坡变形的能力,仅在局部有变形和应力改变。
During the construction period and operation period of high arch dam, the deformation of slope and foundation caused by water storage is a concern. Impoundment has many impacts on the rock mass, including the weakening of the rock mass parameters, the reduction of effective stress and the effect of the floating force. These phenomena are related to the engineering problems such as landslide, the stability of the dam and the earthquake induced by reservoirs. At present, the research on the mechanics mechanism of water storage is still very limited. The method of strength reduction in slope limit analysis is extended to a finite element method that considers both stiffness and strength reduction, and is used to analyze the weakening of rock mass. The effective stress principle of fractured rock mass is applied to Drucker-Prager criterion. Based on the monitoring data of left bank slope deformation and valley contraction of the Jinping Arch Dam, the above two methods are applied to analyze the influence of slope deformation and foundation deformation during the storage period. The results show that the dam has a good ability to withstand the deformation of the slope, with deformation and stress changes only locally.