摘要
为阐明细粒尾矿坝漫顶溃坝事故的致灾机制,在力学分析的基础上,借鉴前人成果,研究漫顶溃坝事故的产生机制和灾变过程。分析结果表明,尾矿坝的漫顶溃坝破坏是由水流牵引应力对坝顶溃口形成的促进作用、下泄水流对溃口的冲切加深作用和边坡失稳对溃口的横向扩展作用3方面共同影响造成的。分析尾矿坝漫顶溃坝的灾变过程可以发现,在坝体横向方向,从下游向上游,尾矿坝被漫顶水流层层剥蚀;在坝体纵向方向,水流的冲蚀作用导致溃口边坡产生间歇性失稳坍塌现象,2个方向的作用导致尾矿坝最终溃决。
The study was aimed at learning about the mechanism and process of dam failure induced by overtopping in fine grained tailings ponds. The failure mechanism of overtopping was analyzed theoretically and the results show that dam-break results from three processes,namely,the breach forming process facilited by traction force of the water flow,the process in which the released flow is deepening the breach,and the broadening process of the breach by landslide. Referring to research findings of analogous earth-filled dam,tailings dam＇s failure process due to overtopping was analyzed. It was discovered that for fine grained tailings dams,collapse is a process in which the dam is disintegrated layer-by-layer from downstream to upstream in lateral direction,and that washing the slope causes landslide intermittently in longitudinal direction,and both the effects lead to dam failure.
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2017年第2期104-108,共5页
China Safety Science Journal
基金
国家自然科学基金重点项目资助(51234004)
关键词
细粒
尾矿坝
漫顶
破坏机制
灾变过程
fine grained
tailings dam
overtopping
failure mechanism
catastrophe process
