上游式尾矿坝地震响应实例分析
发布时间:2018-06-26 04:02
本文选题:上游式尾矿坝 + 粒度分布 ; 参考:《金属矿山》2017年02期
【摘要】:1976年7月28日发生的唐山大地震对区域内的多个尾矿坝造成了不同程度的破坏。为研究地震作用下尾矿坝体的响应特征,以唐山地震前后某尾矿坝勘察成果为依据,分析了地震对尾矿粒度分布、抗剪强度及尾矿压缩特性的影响。研究结果表明:1地震后,尾矿坝上层(埋深≤12 m范围)细粒尾矿增加,下层(埋深12~25 m范围)细粒尾矿减少。2地震对尾矿坝的影响具有区域性。地震后靠近下游坝坡区域尾砂内摩擦角总体降低,上层尾矿变松散,下层尾矿变密实;靠近库内水边线区域,上层尾矿变密实,下层尾矿变松散。3地震作用下尾矿的压缩特性基本不受影响。研究成果可以为地震区上游式尾矿坝的抗震设计提供参考。
[Abstract]:The Tangshan earthquake on July 28, 1976 caused various damage to several tailings dams in the region. In order to study the response characteristics of tailings dam under earthquake action, based on the survey results of a tailings dam before and after the Tangshan earthquake, the effects of earthquake on tailings particle size distribution, shear strength and tailings compression characteristics are analyzed. The results show that after the Wei 1 earthquake, the fine tailings in the upper layer of the tailings dam (buried depth 鈮,
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