摘要
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。
In order to ensure the safe operation of high CFRD during earthquake, it＇s one of the key is-sues of the CFRD （concrete-face rockfill dam）higher than 200 m to adopt reasonable measures for reducing seismic stress of face-slab effectively based on the understanding of the static and dynamic stress distribu-tion characteristics and regular pattern of face-slab. In this study, aseismic measure of the horizontal joint in face-slabs at the optimal position（elevation） combined with flexible reinforcement in roekfill is proposed, according to the distribution of dynamic stress. A three-dimensional static and dynamic finite element analyt-ical method is employed to research the effects of the position（elevation） and length of the horizontal joint for 300 m high CFRD. Based on the analysis of different geometrical characteristic parameters dams, it can be concluded that the effective position（elevation） of horizontal joint is located in central dam sections of 0.7-0.85 H （H is dam height）, effective length is 0.3 L （L is dam axial length）.
出处
《水利学报》
EI
CSCD
北大核心
2014年第4期419-426,共8页
Journal of Hydraulic Engineering
基金
国家自然科学基金资助项目(51379028
91215301
51279025)
新世纪优秀人才支持计划资助(NCET-12-0083)
关键词
面板堆石坝
有限元
面板应力
抗震措施
concrete-faced rockfill dam
finite element
stress of face-slab
aseismic measures
