Process and mechanism of fine grained tailings dam's failure due to overtopping

doi:10.16265/j.cnki.issn1003-3033.2017.02.019

Abstract

Abstract: 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.

Key words: fine grained, tailings dam, overtopping, failure mechanism, catastrophe process

CLC Number:

X928.9

DU Yanqiang , WANG Xinwu , ZHANG Kun , WANG Xiaoqiang , YANG Chunhe. Process and mechanism of fine grained tailings dam's failure due to overtopping[J]. China Safety Science Journal, 2017, 27(2): 104-108.

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