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尾矿坝的渗流状态是影响上游法筑坝尾矿库安全稳定性的重要因素之一。以阜新地区阿哈来铁尾矿和同乃铁尾矿为研究对象,探讨了尾矿坝渗透系数的合理取值问题。通过室内试验得出阿哈来铁尾矿和同乃铁尾矿的基本物理性质。两种铁尾矿均级配不良,同乃铁尾矿属于含砂低液限粉土,阿哈来铁尾矿属于粉土质砂。使用自行研制的“固结-渗透联合测定装置”进行试验,得出了“固结压力-孔隙比-渗透系数”的定量变化规律。结果表明,阿哈来铁尾矿渗透系数较大。随着固结压力的增大铁尾矿的孔隙比减小,渗透系数也在减小且减小程度很大。在孔隙比减小的初期,渗透系数减小较快;而在孔隙比减小的后期,渗透系数减小速度放缓。在铁尾矿固结压缩过程中,渗透系数随着孔隙比的减小呈高斯曲线关系降低。
The seepage status of the tailings dam is one of the important factors that affect the safety and stability of the tailings dam constructed by the upstream method. Taking the Ahalaite tailing and Tongnitai tailing in Fuxin area as the research object, the reasonable value of permeability coefficient of tailing dam is discussed. The basic physical properties of Ahalayite tailings and Tongnai iron tailings are obtained through laboratory experiments. Both iron tailings are bad grade with the same iron ore tailings belong to the low liquid limit silt sand, iron ore alluvial silt is sandy soil. Using “self-developed” consolidation - osmotic combined measuring device “test, obtained” consolidation pressure - porosity ratio - permeability coefficient "quantitative changes. The results show that the permeability coefficient of ahalaite tailings is larger. With the increase of consolidation pressure, the pore ratio of iron tailings decreases and the permeability coefficient decreases and decreases to a great extent. At the early stage of porosity reduction, the permeability coefficient decreases rapidly, while the decrease of permeability coefficient slows down at the later stage of porosity reduction. In the consolidation process of iron tailings, the permeability coefficient decreases with Gaussian curve as porosity decreases.