不同筋料对尾矿坝渗透特性影响规律研究  

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

作　　者：白建平[1] 叶辰[1] 赵一姝[1] 敬小非[1] 周筱[1] 

机构地区：[1]重庆科技学院安全工程学院,重庆401331

出　　处：《中国安全生产科学技术》2016年第8期55-59,共5页Journal of Safety Science and Technology

基　　金：国家自然科学基金项目(51404049);重庆市教委科学技术研究项目(KJ1501328);重庆科技学院重点项目培育基金(CK2014Z12);重庆科技学院研究生科技创新计划项目(YKJCX2015034);重庆市地质矿产勘查开发局科技项目;重庆市研究生科研创新项目(CYS15228);重庆市科慧杯项目(71160)

摘　　要：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。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.

关 键 词：筋带密度 变水头 渗透系数 有限元分析 

分 类 号：X936[环境科学与工程—安全科学]