凍融循環(huán)條件下尾礦材料力學(xué)行為的關(guān)鍵影響因素研究
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1.武漢理工大學(xué);2.安徽馬鋼礦業(yè)資源集團姑山礦業(yè)有限公司白象山礦業(yè)分公司

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國家自然科學(xué)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?jì)鋈谘h(huán)條件下尾礦材料力學(xué)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辙售。采用了凍融循環(huán)試驗和三軸剪切試驗作為主要的試驗手段出嘹,對不同含水率的尾礦試樣進(jìn)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(jìn)行了三軸剪切試驗。試驗結果表明婿孟,隨著(zhù)凍融循環(huán)次數的增加,尾礦的宏觀(guān)結構變形顯著(zhù)增加,尤其是當含水率設定為15 %時(shí)姐呐,經(jīng)過(guò)7次凍融循環(huán)后肪躯,孔隙結構發(fā)生了顯著(zhù)變化,0-250 μm3體積級別的孔隙數量明顯增多。此外,研究發(fā)現增大圍壓可以提高尾礦的彈性模量,并抑制凍融循環(huán)作用對尾礦的損傷莱找。尾礦的變形模量在經(jīng)歷5次凍融循環(huán)后趨于穩定劲弦,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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