Distribution of shear strength parameters and safety influence of unsaturated tailings

doi:10.16265/j.cnki.issn1003-3033.2017.04.021

Abstract

Abstract: To study influence of unsaturated tailings on safety of tailing ponds, two-dimensional unsaturated seepage experiments and direct shear tests were carried out. Spatial distributions of cohesive force and internal friction angle of unsaturated tailings were studied. The method of parameters optimization was used to calculate the unknown parameters of the analytic model and the whole model was used to analyze the results of the unsaturated seepage experiments. The influence of unsaturated tailings on the dam safety factor was analyzed by numerical computation. The results show that distribution of water content of unsaturated tailings is like an exponential function in both horizontal and vertical directions,that the cohesive force increases at first with water content and then decreases, there is a negative correlation between internal friction angle and water content, and spatial distribution characteristics are owned by shear strength parameters,and that there is a negative correlation between the dam safety factor and thickness of the unsaturated tailings layer.

Key words: tailings, unsaturated seepage, water content, cohesive force, internal friction angle, safety factor

CLC Number:

LIN Xuesong, CHEN Dianqiang, WANG Laigui. Distribution of shear strength parameters and safety influence of unsaturated tailings[J]. China Safety Science Journal, 2017, 27(4): 116-121.

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