覆盖层上混凝土-堆石混合坝模型试验研究

发布时间：2018-04-24 03:12

本文选题：混凝土-堆石混合坝 + 模型试验　；参考：《岩土力学》2017年03期

【摘要】：混凝土-堆石混合坝由混凝土墙、堆石以及之间的垫层和过渡层组合而成,作为一种新型结构,目前针对其受力机制及变形特性的研究较少。基于此,开展覆盖层上混凝土-堆石混合坝模型试验研究,测得填筑和蓄水期不同高度处墙体的土压力和位移,探讨混合坝的工作机制,最后根据模型试验结果提出了考虑墙体位移的修正土压力计算公式。研究结果表明:在填筑期,堆石处于主动极限状态和静止状态之间,混凝土墙受到的堆石压力较小;蓄水后,堆石接近静止状态,混凝土墙受到的堆石压力比填筑结束时刻增加了一倍左右;修正土压力公式能够较好地反映混合坝在填筑期和蓄水期土压力随墙体位移变化的规律;混凝土墙的抗滑安全系数最小值出现在填筑结束时刻,满足相关要求,说明混合坝对覆盖层有较好的适应性。
[Abstract]:As a new type of structure, concrete / rockfill dam is composed of concrete wall, rockfill and the cushion and transition layer between them. As a new type of structure, there are few researches on its mechanical mechanism and deformation characteristics at present. On the basis of this, the model test study of concrete-rockfill dam on overburden is carried out, the earth pressure and displacement of wall at different height during filling and storage period are measured, and the working mechanism of mixed dam is discussed. Finally, based on the model test results, a modified earth pressure formula considering wall displacement is proposed. The results show that during the filling period, between the active limit state and the static state, the concrete wall is subjected to less rockfill pressure, and after impounding, the rockfill is close to the static state. The rockfill pressure of concrete wall is about twice as high as that at the end of filling, and the modified earth pressure formula can better reflect the variation of soil pressure with wall displacement during the filling period and storage period of mixed dam. The minimum value of the safety factor of concrete wall appears at the end of filling, which meets the relevant requirements, which shows that the hybrid dam has better adaptability to the overburden.
【作者单位】：河海大学岩土力学与堤坝工程教育部重点实验室;河海大学土木与交通学院;新疆农业大学水利与土木工程学院;
【基金】：国家自然科学基金面上项目(No.51479059) 长江学者创新团队发展计划资助(No.IRT1125)~~
【分类号】：TV64

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