尾矿料的动力特性试验研究

通过对某铜矿的尾矿料进行动三轴和共振柱试验，研究了尾矿材料动力变形特性，提出了简单实用的孔隙水压力模型，给出了能更加准确地预测尾矿材料的动孔隙水压力的公式，并将其与Seed提出的预测公式进行了比较。在不同密度尾矿料的动三轴试验基础上，分析了相对密度对液化特性的影响，得出了相对密度小于70 %时抗液化强度随相对密度的增加而明显增加的结论。在不同围压下进行动三轴试验，结果表明：在相同的液化振次条件下，围压越高，动剪应力比越低。由共振柱试验可知，尾矿料的阻尼比随着动剪应变幅的增大而增大，而动剪模量随动剪应变幅的增大而减小，动剪模量和阻尼比与动剪应变幅的关系受围压影响不太敏感。

Experimental study on dynamic characteristics of tailings material

Through the dynamic triaxial tests and the resonant column apparatus tests of the tailings material taken from a copper mine, the dynamic deformation properties are studied. From the experiment results, a practical strain pore-water pressure model is given and a formula to forecast the dynamic pore-water pressure is presented. Compared with Seed’s forecast formula, the formula can forecast the dynamic pore-water pressure of saturated tailings material more precisely. Based on the effect of different relative density on liquefaction property of tailings material, a conclusion is drawn that the liquefaction strength will obviously increase with the increase of relative density before the relative density is less than 70%. From the dynamic triaxial tests with different confining pressures, it is found that the dynamic shear stress ratio is less while the confining pressure is more in the condition of the same vibration times. Through the resonant column apparatus tests, it can be found that the damping ratio will increase with the dynamic shear strain increases, while dynamic shear modulus will decrease at the same time. And another conclusion that the relationship between dynamic shear modulus and damping ratio with dynamic shear strain is not sensitive to the confining pressure can be drawn.