不同筋料对尾矿坝渗透特性影响规律研究

铺设加筋材料作为一种普遍使用的提高土体或坝体稳定性的工程措施，在提高坝 体力学强度的同时，在筋带处形成的混合体也改变了尾矿砂自身的渗透特性。采用理论 分析、渗透试验和数值模拟相结合的研究手段，探析了不同筋带密度下土工格栅与土工 织物对尾矿砂渗透系数的影响。结果表明:土工格栅与土工织物两种加筋方式均会使尾 矿砂渗透系数减小；土工织物加筋在渗流时会阻挡细粒组运移，有效避免细粒组随渗透 水流出，从而降低试件渗透系数；土工格栅则通过横肋对尾矿砂颗粒的嵌锁作用阻滞颗 粒运移，致使渗流过程中孔隙扩展变弱，最终达到降低渗透系数的作用。研究成果加深 了对加筋尾矿坝渗透规律的认识，为研究加筋尾矿坝的稳定性提供了新的思路。

Study on influence laws of different reinforced materials on permeability characteristics of tailing dam

As a common engineering measure to improve the stability of soil or dam, laying reinforced materials improves the mechanical strength of dam, meanwhile, the mixture formed by the reinforcement also changes the permeability characteristics of tailing sand. The influence of geogrid and geotextile on the permeability coefficient of tailing sand under different reinforcement densities was studied by the combined methods of theoretical analysis, permeability test and numerical simulation. The results showed that both the reinforcement ways of geogrid and geotextile will reduce the permeability coefficient of tailing sand. The geotextile reinforcement will obstruct the migration of fine particle group during the seepage process, avoid the outflow of fine particle group with the seepage water effectively, thus decrease the permeability coefficient of specimens. The geogrid will obstruct the migration of particles through the interlock acting of transverse rib on the particles of tailing sand, which causes the weakening of pore expansion during the seepage process, and ultimately achieves the effect of reducing permeability coefficient. The results deepen the understanding on seepage laws of reinforced tailing dam, and provide new ideas for studying the stability of reinforced tailing dam.