【摘要】 准确把握高面板堆石坝静、动力条件下面板高应力区分布特性是保障防渗面板安全的关键问题。本文采用非线性三维有限元方法,以200m高坝为例,系统地研究高混凝土面板堆石坝在填筑和蓄水过程、遭遇瞬时地震及震后面板的高拉与压应力区分布特性及其规律,以及坝体几何特征参数对面板高应力区分布的影响。研究结果表明:面板顺坡向高拉应力区集中分布在河谷处岸坡附近及河谷中央(河谷坝段)坝高4/5~2/3范围内,坝轴向高压应力区主要分布在河谷中央竖缝两侧面板之间,据此建议了一系列改善面板应力的工程措施。更多还原

【Abstract】 It’s a key issue on keeping the safety of the face-slab to accurately grasp its static and dynam ic stress distribution characteristics. In this paper,the three-dimensional nonlinear static and dynamic finite element mode GEODYNA is adopted to research the stress distribution characteristics of the face-slab un der different cases such as the empty and full reservoir cases,under and after the earthquake. The distribu tion of the zones in high tensile stress state and compressive stress state are researched respectively,and the influence of the geometrical parameters on the stress distribution of the face-slab is also studied. The results show that the high slop-direction tensile stress mainly appears near the bank and 4/5～2/3H area in the middle section of the dam,and the high axial-direction compressive stress area concentrates on the slab between the vertical joints in the central valley. According to these conclusions,some engineering aseismic measures on improving the stress of face-slab are proposed.更多还原