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| Experimental study on seepage and consolidation characteristics of waste rock mesh-tailings combined dam construction |
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Received:November 26, 2024
Revised:February 21, 2025
Accepted:March 11, 2025
Published Online:April 30, 2026
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| DOI：10.3969/j.issn.1005-7854.2026.01.002 |
| KeyWord:waste rock mesh;tailings dam;model test;seepage characteristics;consolidation mechanics |
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| 1.Falcuty of Land and Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China;2.China Nonferrous Metals Industry Kunming Survey and Design Institute Co. Ltd., Kunming 650051, China |
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| Abstract: |
| The waste rock mesh dam construction method is an innovative tailings disposal technique that combines waste rock and tailings deposition to enhance the mechanical properties of tailings sand and accelerate the seepage consolidation process. Taking the Longdu tailings dam as the engineering background, this study conducted indoor model tests based on the similarity principle to systematically investigate the influence of different waste rock gradations and mesh sizes on the phreatic line depth and unit seepage flow of the tailings dam. After determining the optimal gradation and mesh spacing, the effect of different dam slope ratios on the static mechanical properties of the tailings sand was further analyzed. The test results showed that the use of waste rock mesh with the highest coarse-grained content (Grade C) significantly lowered the phreatic line and achieved the highest unit seepage flow. Reducing the center spacing of the waste rock mesh further increased the seepage flow while decreasing the phreatic line depth. A gentler dam slope corresponded to a lower phreatic line. Regarding consolidation characteristics, the void ratio of the tailings sand gradually decreased with depth, consistent with self-weight consolidation behavior. Under different slope conditions, the cohesion of the tailings sand increased with sampling depth, and the internal friction angle slightly improved after consolidation. This study provides a basis for the engineering design and parameter optimization of waste rock-tailings combined dam construction and offers guidance for further research on load-sharing mechanisms and collaborative dam-building technologies for tailings dams. |
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