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通过应力控制式动三轴不排水循环剪切试验,对饱和尾矿土在循环应力比、轴–径向固结应力比等因素下孔隙水压力与累积能量耗散关系进行研究。研究结果表明孔隙水压力增长与塑性应变累积能量耗散和土体黏滞累积能量耗散密切相关。当循环应力比cR介于0.205~0.238、轴–径向固结应力比cK介于1.0~1.3时,孔隙水压力–能量之间存在临界状态。通过非线性回归分析初步建立了循环应力比和轴–径向固结应力比条件下饱和尾矿土的孔隙水压力能量模型,从变化机理上阐述孔隙水压力的变化规律并消除了周次的不确定性对于孔隙水压力模型的影响,对预测循环荷载作用下饱和土的孔隙水压力具有借鉴意义。
The relationship between pore water pressure and cumulative energy dissipation of saturated tailings soil under cyclic stress ratio, axial-radial consolidation stress ratio and other factors was studied by stress-controlled dynamic triaxial undrained cyclic shear test. The results show that the pore water pressure increase is closely related to the cumulative energy dissipation of plastic strain and the energy dissipation of viscous accumulation of soil. When the cyclic stress ratio is between 0.205 and 0.238 cR and the axial and radial stress ratio cK is between 1.0 and 1.3, there is a critical state between pore water pressure and energy. Through the nonlinear regression analysis, the pore water pressure energy model of saturated tailings soil under cyclic stress ratio and axial consolidation stress ratio was preliminarily established, and the variation law of pore water pressure was expounded from the change mechanism and eliminated The influence of uncertainty on the pore water pressure model can be used to predict the pore water pressure of saturated soil under cyclic loading.