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在把握混凝土防渗面板地震响应及工作特性的基础上,采取工程措施有效降低面板的地震应力,保证强震时超高面板坝的安全运行,是面板坝跨越200 m级向更高坝发展亟待解决的关键技术问题之一。本文建议了一种根据面板动应力响应确定在最优位置(高程)设置永久水平缝及采用柔性加筋结构的组合抗震措施来有效降低面板地震应力,并以300 m超高坝为例,通过非线性三维有限元方法,系统地研究了永久水平缝设置位置(高程)、长度对地震应力改善效果的影响。并对不同坝高、河谷岸坡的数模坝进行分析计算,总结给出永久水平缝有效的设置位置(顺坡向动拉应力最大处)范围为0.70 H~0.85 H(H,坝高)的河谷中部坝段,其长度为0.3 L(L,坝轴长)左右。
On the basis of grasping the seismic response and working characteristics of concrete impervious panel, engineering measures are taken to reduce the seismic stress effectively and ensure the safe operation of ultra-tall panel dam during strong earthquakes Solve one of the key technical issues. This paper proposes a combination of aseismic measures to determine the permanent horizontal seam at the optimal position (elevation) and to adopt the flexible stiffened structure to effectively reduce the seismic stress of the panel according to the dynamic stress response of the panel. Taking the 300 m ultrahigh dam as an example, Nonlinear three-dimensional finite element method, systematically studied the effect of permanent horizontal seam location (elevation) and length on seismic stress improvement. And the numerical simulation dam with different dam height and river valley slope is analyzed and calculated. The effective setting position of permanent horizontal seam (the maximum tensile stress along the slope) is summarized as 0.70 H ~ 0.85 H (H, dam height) The central valley of the valley has a length of 0.3 L (L, length of the dam).