考虑干密度影响的尾矿材料土水特征曲线模型及其应用

尾矿坝在运行过程中，堆积尾矿处于干湿交替环境，进行稳定性分析需要确定其抗剪强度和渗透系数。直接测量上述参数存在价格昂贵、耗时等缺点，而土水特征曲线是研究土的非饱和特性的重要工具。针对典型的尾矿材料，分别进行不同干密度尾矿样的脱水试验，测量不同吸力下尾矿样的含水量。在此基础上，整理得到不同干密度下尾矿样的土水特征曲线，采用Gardner模型对其进行拟合，得到考虑干密度影响的尾矿材料土水特征曲线模型。最后，将其应用于尾矿边坡的稳定性分析中，探求基质吸力对边坡稳定性的影响。研究成果可为尾矿材料的力学特性以及非饱和尾矿坝稳定性分析提供理论基础。

Study on soil-water characteristic curve modeling of tailings material considering the effect of dry density and its application

The tailings is at the alternate wetting and drying environment during the process of operation, and it is necessary to obtain the shear strength and permeability coefficient of the unsaturated tailings material for the stability analysis of tailings dams. However, direct measurement of the above parameters are expensive and time-consuming. The SWCC (Soil-water Characteristic Curve) is a very important instrument to study the property of unsaturated soil. Based on a typical tailings material, the dehydration tests of saturated tailings samples under different dry density were conducted. The water contents under different matric suction were accurately measured during the test. On this basis, the SWCC of tailings sample under different dry density was obtained. The measured data was fitted with Gardner model, and a new SWCC model considering the effect of dry density was obtained. Finally, this model was used to analyze the slope stability, and the effect of matric suction on slope stability was researched. The above research results can provide theoretical basis for the mechanical property of tailings and the stability analysis of unsaturated tailings dams.