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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。
Concrete - rockfill dam is a combination of concrete wall, rockfill and cushion and transitional layer. As a new type of structure, there are few researches on its mechanics and deformation characteristics. Based on this, the model test of the concrete-rockfill dam is carried out on the overburden. The earth pressure and displacement of the wall at different heights during filling and storage are measured, and the working mechanism of the mixing dam is discussed. Finally, based on the model test results Correction earth pressure calculation formula considering wall displacement. The results show that during the filling period, the rockfill is between the active limit state and the quiescent state, and the pressure of rockfill faced by the concrete wall is small; after the water is impounded, the rockfill is close to the quiescent state; The time of completion of construction is doubled. The revised formula of earth pressure can better reflect the law of earth pressure with the displacement of wall during the filling period and water storage period. The minimum value of anti-sliding safety factor of concrete wall appears at the time of filling Building the end of the moment to meet the relevant requirements, indicating that the mixed dam on the cover has a better adaptability.