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分别对含筋层数为1、2、4层的尾矿中砂和细砂进行三轴压缩试验,给出了不同增强层数下尾细中砂的邓肯-张模型参数。2层以下加筋时,土工织物对尾矿砂的横向变形约束作用较小,尾中细砂均表现为剪切破坏特征;在2～4层增强时,尾中细砂均表现为拉应力破坏特征;拉破坏条件下和剪切滑移破坏条件下,均发现加筋后的尾矿,凝聚力随加筋层数非线性增大,而内摩擦角基本不变。定义了增强效果系数,层数与该系数呈非线性关系。轴向应变小于5%～8%时,尾矿砂处于弹性变形阶段;轴向应变大于8%时,出现弹塑性耦合变形。
The triaxial compression tests are carried out on the tailing sand and fine sand containing 1, 2, and 4 layers respectively, and the Duncan-Chang model parameters of tailings fine sand with different enhancement layers are given. When reinforced below 2 layers, the effect of geotextile on transverse deformation of tailing sand is small, and the fine sand in the tail shows the characteristics of shear failure. At the enhancement of 2 ~ 4 layers, the fine sand in the tail shows the failure of tensile stress It is found that the tailing increases with the failure of shear failure and shear slip, and the cohesion increases nonlinearly with the number of stiffened layers, while the internal friction angle remains unchanged. The coefficient of enhancement effect is defined, and the number of layers is nonlinear with the coefficient. When the axial strain is less than 5% ~ 8%, the tailing sand is in the stage of elastic deformation; when the axial strain is more than 8%, the elastic-plastic coupling deformation occurs.