凍融循環條件下尾礦材料力學行為的關鍵影響因素研究
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1.武漢理工大學;2.安徽馬鋼礦業資源集團姑山礦業有限公司白象山礦業分公司

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國家自然科學基金面上項目(42271296)


Study on the Key Influencing Factors on the Mechanical Behavior of Tailings Materials Under Freeze-Thaw Cycle Conditions
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Wuhan University of Technology

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    摘要:

    為探究凍融循環條件下尾礦材料力學特性的演變規律,以期為尾礦壩的安全性和穩定性評估提供理論依據。采用了凍融循環試驗和三軸剪切試驗作為主要的試驗手段,對不同含水率的尾礦試樣進行了1、3、5、7、9次凍融試驗,并在100 kPa至400 kPa的圍壓條件下進行了三軸剪切試驗。試驗結果表明,隨著凍融循環次數的增加,尾礦的宏觀結構變形顯著增加,尤其是當含水率設定為15 %時,經過7次凍融循環后,孔隙結構發生了顯著變化,0-250 μm3體積級別的孔隙數量明顯增多。此外,研究發現增大圍壓可以提高尾礦的彈性模量,并抑制凍融循環作用對尾礦的損傷。尾礦的變形模量在經歷5次凍融循環后趨于穩定,而高含水率的尾礦樣本展現出較低的黏聚力、內摩擦角和變形模量。

    Abstract:

    In order to investigate the evolution of the mechanical properties of tailings materials under freeze-thaw cycle conditions, with a view to providing a theoretical basis for the safety and stability assessment of tailings dams. Freeze-thaw cycle test and triaxial shear test were adopted as the main test methods, and the tailings specimens with different water content were subjected to 1, 3, 5, 7 and 9 freeze-thaw tests, and triaxial shear tests were carried out under the peripheral pressure conditions from 100kPa to 400kPa. The test results showed that the macrostructural deformation of the tailings increased significantly with the increase in the number of freeze-thaw cycles, especially when the water content was set at 15%, the pore structure changed significantly after seven freeze-thaw cycles, and the number of pores in the 0-250 μm3 volume class increased significantly. In addition, it was found that increasing the enclosing pressure could increase the elastic modulus of the tailings and inhibit the damage to the tailings by freeze-thaw cycling action. The deformation modulus of the tailings stabilized after five freeze-thaw cycles, while the tailings samples with high water content exhibited lower cohesion, internal friction angle and deformation modulus.

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  • 收稿日期:2024-04-19
  • 最后修改日期:2024-06-17
  • 錄用日期:2024-06-18
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