Abstract
From construction to operation, tailings have to go through a long period of time. With the passage of time, the early deposited tailings are gradually covered by the later deposited tailings, and the overburden on the accumulated tailings gradually increases. The different deposition time of tailings dam and the physical and mechanical characteristics of tailings in the sedimentary area are quite different, especially for high-stacked tailings dam. Therefore, it is very important to study the variation of physical and mechanical characteristics in the tailings of high-stacked tailings. In this paper, according to the early, middle and late operational stages, from 1989 to 2005, large scale drilling, in-situ testing and indoor testing were carried out on a certain upstream high pile tailings dam with a maximum thickness of 60m, 100m, and 125m. The physical and mechanical indexes of tailings were divided according to the time and place of deposition, in order to find out the changing laws of physical and mechanical characteristics of the tailings sand around 16 years ago. According to the changing law of the physical and mechanical characteristics of tailings, this paper puts forward the statistical tailings parameters according to the different deposition time and location of tailings, the research results provide reference for choosing the calculating parameters in designing and analyzing tailings dams. Its research results have been applied in the protection of the tailings dam, the tailings reservoir environment protection, and the safety hidden danger management of tailings reservoirs.
Highlights
From construction to operation, tailings have to go through a long period of time
The largest variation is about 5 to 15 m in depth, and the change tends to flatten around 25 buried depths. This shows that the physical characteristics of tailings in the 0-25m range have a close relationship with time, and below 25M is mainly affected by the depth of burial
At depths greater than 25m, the tailings are less affected by the deposition time and more affected by the upper cover
Summary
(1) Table 1: In 1989 compared with 2005, the dry density of weathered tailings decreased, the natural pore ratio became larger, the cohesive force decreased, and the permeability coefficient decreased. 3—3.2m(Water level 5.2m) rd 1.54/ tail medium sand 1.52/ tail medium sand 1.49/ tail medium sand e Jingang He et al.: An Analysis of the Physical Mechanics Characteristics of a High-stacked Tailings Dam. It can be seen that: (1) Table 3 shows that the dry density, natural pore ratio, and specific gravity of the dark iron-containing minerals in the middle are mostly higher than those of the upper and lower tailings. With the increase of time, the total permeability coefficient of the experiment column basically showed a declining trend [9] This shows that the main reason for the decrease of the permeability coefficient of the tailings is that the ferrous ions produced by the oxidation of pyrite in the shallow oxidation zone and the oxidation transition zone remain in the tailings.
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