【摘要】 目前国内外不少用尾砂充填的矿山,存在尾砂量不足的问题。本文从研究尾砂的物理力学性质出发,探讨更多细粒级尾砂用于充填的可能性。 试验表明,尾砂的渗透系数K₁₀同空隙率P和比表面积S间存在下列函数关系: K₁₀=（b′p-a′）e^-bs 尾砂的内摩擦系数tgφ与细粒级（-20μm）含量（X）之间是幂函数关系。 tgφ=ax^-b 试验结果又表明,内摩擦系数是随正压力的加大而下降。 尾砂压缩模量E和平均粒径（?）的关系是随加压过程而变化的,其关系式如下: 加压初期 E₀=a+bln（?） 后期 E=a-bln（?） 由模拟试验得知,在尾砂受压时,垂直压力系数曲线在砂层高H和试简直径D的比例为1.5处有交点,压强是随H/D和粒径的不同而变化。 在尾砂胶结充填中,抗压强度随细粒级含量的增加而提高,但存在有一个最佳值。 实验中采用了正交试验设计和回归分析方法。结果表明,充填尾砂中细粒级含量有可能进一步提高,增加充填尾砂的利用率,充填体性质也有所改进。更多还原

【Abstract】 An investigation of tailings recovery of some mill plants was carried out. It was found that recovery of railings for underground backfill is low. Many mill plants are of shortage in tailings for backfill.An approach to the utilization of fine railings is given in the article based on the study of physical and mechanical properties of fine tailings.Percolation rate tests of railings with different content of fines were carried out. According to the test results and practice, the percolation rate of about 4-6 cm/hr can be accepted The. relationship between percolation rate （K） and porosity （P）and specific surface （S） of railings is illustrated by the following equationK=（b’p-a’）e^-b2The relationship between friction coefficient （tan φ） and the quantity （x） of fines （-20μm） can be expressed by equationtanφ=ax^-bThe test results indicated that tanφ is decreased with the increase of normal compressive stress.Compressive modulus （E） changes with the fine railings content （?）and the progressing of stress. In the primary period of loading the relationship between E and d isE₀=a+b 1n（?）In the later period the relationship isE₀=a-b In（?）That means E decreases with the decrease of （?）; E increases with the decrease of d.The behaviour of force transmission through the tailings fill depends on the particle size distribution and the ratio of the fill height to the container diameter.The compressive strength of cemented backfill increases as the fines content increases to a certain extent.The experimental data indicated that it is possible to increase the fines content in the fill, thus utilization coefficient of tailings is raised and properties of fill will be improved.更多还原