高面板坝护坡面板的钉结抗震加固效果分析

Study on Nailing Seismic Reinforcement Measures for Slope Protection Face Slab of High Dam

对强震作用下坝体下游护坡面板钉结加固前后的受力状态和稳定性进行分析,推导得到面板抗滑稳定安全系数的表达式。基于某面板堆石坝的动力有限元计算结果,得到坝顶至坝顶以下21 m范围内的护坡面板会沿坝坡的法线方向滑动逸出,应采取钉结措施对面板进行抗震加固。利用以往钢筋在堆石料中拉拔试验的研究成果,研究面板尺寸和钢筋嵌入深度对面板钉结加固措施的效果,结果表明,面板尺寸越小、钢筋嵌入深度越大,面板的抗滑稳定安全系数越大。

The stress state and stability of downstream slope protection face slab before and after nailing reinforcement under strong earthquake were analyzed and the expression of stability safety factor of face slab was deduced.Based on the dynamic finite element calculation results of faced rockfill dam,it was calculated that the slope protection face slab within 21 m from the dam top would slide out along the normal direc tion of the dam slope,so nailing measures should be taken to enter the face slab seismic reinforcement.In addition,based on the previous re search results of pull out tests of reinforcing bars in rockfill materials,the effect of slab size and embedded depth of reinforcing bars on slab nailing reinforcement measures was studied.The results show that the smaller the size of slab,the greater the embedded depth of reinforcing bars,the greater the safety factor of sliding stability of slab.