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| Experimental Study on Dam Break Model of Seepage in TailingsReservoir |
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Received:October 08, 2018
Revised:December 19, 2018
Accepted:November 26, 2018
Published Online:December 24, 2019
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| DOI： |
| KeyWord:tailings reservoir; Seepage failure; Dam-break process; Dam burst development; Tail sand deposition |
| Author | Institution |
| Yang yuting |
Faculty of Land Resources Engineeirng, Kunming University of Science and Technology |
| Ai ming |
Faculty of Land Resources Engineeirng, Kunming University of Science and Technology |
| Zhao huaigang |
Faculty of Land Resources Engineeirng, Kunming University of Science and Technology |
| Xu zhifa |
Faculty of Land Resources Engineeirng, Kunming University of Science and Technology |
| Yang anyin |
Faculty of Land Resources Engineeirng, Kunming University of Science and Technology |
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| Abstract: |
| The seepage failure is one of the important induction factors for dam-break in the tailings reservoir. However, there are still few studies on the effect of seepage failure on the dam-breaking of the tailings reservoir. Therefore, Based on the engineering background of a tailings repository in Yunnan, a self-designed tailing reservoir dam-breaking experimental device was used to carry out experimental research, and to analyze the dam-breaking process of the tailings reservoir, the development of the dam burst, and the sediment deposition under the seepage failure. The results show that: Movable particles in the voids are taken away by the permeated water flow, causing the initial percolation channels to build up and expand, forming a concentrated flow channel, and the overflow and swamping occurred at the dam overflow point. With the expansion of the concentrated seepage passage of the dam body, the saturated dam at the upper part of the outfall point will settle and collapse under the action of its own weight, and the upstream dam body will develop into a traction type, and then the water flow in the reservoir will reach the lowest point of the collapsed part of the dam roof, and lead to the formation of a breach, the dam failure mode of dam collapse from reverse traction damage to overflow erosion damage.The development of the breach is mainly caused by the erosion of the dam-breaking water flow. At different times of the dam-break, the development of the breach is different. On the early and middle stages, the development of the breach are mainly below the cut, and the later it is the horizontal broadening.Due to the sorting effect of water flow, the deposition of silt in the lower reaches of the dam body increases with the evolution distance, showing a coarse-to-fine sedimentary rule, and a grading phenomenon of particle size appears at different positions. |
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