筋带密度对尾矿坝漫顶破坏规律影响研究

基于相似理论和溃决侵蚀原理，进行不同加筋密度条件下尾矿坝洪水漫顶破坏模 型试验，探析了筋带密度对尾矿坝漫顶破坏影响规律。试验结果发现:①随着筋带密度 的增加显著提升了尾矿坝的力学强度，但也导致了坝体内的浸润线升高；②筋带密度的 增加使溃口由“Y”型逐渐向“H”型转变；③筋带密度的增加阻滞了漫坝破坏的发展， 坝体位移及内部应力变化量明显减小；④增加筋带密度提高了坝体的抗冲刷能力，减弱 了洪水对蚀沟两岸尾砂的拉拽作用，保证了蚀沟两翼坝体的稳定；⑤随着筋带密度增加 ，可有效减小坝体位移和溃口深度、宽度的发展，当筋带超过2层后，筋带层数的增加 对坝体溃口宽、深基本无影响。研究成果深入探析了筋带密度对漫顶破坏影响规律，在 尾矿坝加筋研究方面提供了科学依据。

Study on influence of reinforcement density on overtopping failure of tailings dam

Based on the similarity theory and the outburst erosion principle, the model experiments on flood overtopping failure of tailings dam under different reinforcement densities were carried out, and the influence law of reinforcement density on overtopping failure of tailings dam was analyzed. The results showed that with the increase of reinforcement density, the mechanical strength of tailings dam increased significantly, however, it also led to the rise of saturation lines in the dam. The increase of reinforcement density made the breach convert from "Y" type to "H" type, and it blocked the development of overtopping failure, so the dam displacement and internal stress variation decreased obviously. The increase of reinforcement density improved the erosion resistibility of dam, weakened the pull effect of flood on tailings at both sides of erosion gully, so as to ensure the stability of dam on both wings of erosion gully. The increase of reinforcement density could effectively reduce the dam displacement and the development of breach depth and width, but when the reinforcement strip was more than two layers, the increase of reinforcement strip layer number had mainly no influence on the depth and width of dam breach. The results discussed the influence law of reinforcement density on overtopping failure, which provides scientific basis for research on the reinforcement of tailings dam.