粒径对尾矿抗剪强度及坝体稳定性影响
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摘要
为解决尾砂安全筑坝与井下充填之间的矛盾,开展了粒径对尾矿强度及坝体稳定性影响的研究。试验结果表明:尾砂加权平均粒径随干滩长度增大而下降的速率越来越缓,加权平均粒径与滩长之间关系满足幂函数沉积模型;尾矿内摩擦角随粒料加权平均粒径的减小而减小,当加权平均粒径小于0.05mm时,内摩擦角显著减小;尾矿坝稳定性随粒料加权平均粒径的减小而降低,当加权平均粒径小于0.05mm时坝体稳定性显著降低。研究结果为尾砂安全筑坝与井下粗料充填提供可借鉴的界限粒径,对于其它相同类型尾砂安全筑坝同样具有重要参考价值。
In order to solve the contradiction between safety damming and downhole filling of tailings dams, the effects of particle size on tailing strength and dam stability are studied. The tests show that, the weighted average particle size of tailings decreases slowly with the increase of dry beach length, the relationship between the weighted average particle size of tailings and the length of the beach is the power function deposition model. The internal friction angle of tailings decreases with the decrease of the weighted average particle size, and the internal friction angle of tailings decreases significantly when the weighted average particle size is less than 0.05 mm. The stability of tailings dams decreases with the decrease of the weighted average particle size, and the stability of dam decreases significantly when the weighted average particle size is less than 0.05 mm. The results of this study provide a reference for the boundary particle size of tailing sand for safe dam construction and coarse material-filled underground.
In order to solve the contradiction between safety damming and downhole filling of tailings dams, the effects of particle size on tailing strength and dam stability are studied. The tests show that, the weighted average particle size of tailings decreases slowly with the increase of dry beach length, the relationship between the weighted average particle size of tailings and the length of the beach is the power function deposition model. The internal friction angle of tailings decreases with the decrease of the weighted average particle size, and the internal friction angle of tailings decreases significantly when the weighted average particle size is less than 0.05 mm. The stability of tailings dams decreases with the decrease of the weighted average particle size, and the stability of dam decreases significantly when the weighted average particle size is less than 0.05 mm. The results of this study provide a reference for the boundary particle size of tailing sand for safe dam construction and coarse material-filled underground.
引文
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[2]RICO M,BENITO G,SALGUEIRO A R,et al.Reported tailings dam failures:a review of the European incidents in the worldwide context[J].Journal of Hazardous Materials,2008,152(2):846-852.
[3]BELKHATIR M,SCHANZ T,ARAB A.Effect of fines content and void ratio on the saturated hydraulic conductivity and undrained shear strength of sand-silt mixtures[J].Environmental Earth Sciences,2013,70(6):2469-2479.
[4]PROSKIN S,SEGO D,ALOSTAZ M.Freeze-thaw and consolidation tests on Suncor mature fine tailings(MFT)[J].Cold Regions Science&Technology,2010,63(3):110-120.
[5]徐宏达.上游式尾矿坝的沉积规律[J].中国矿山工程,2003,32(5):40-43.(XU Hong-da.The law of deposition about upstream tailings dam[J].China Mine Engineering,2003,32(5):40-43.(in Chinese))
[6]刘俊生,王勇升.尾矿级配特征和渗透性关系研究[J].有色金属科学与工程,1995,9(3):42-46.(LIU Jun-sheng,WANG Yong-sheng.Relationship between character of tailing gradation and permeability[J].Nonferrous Metals Science and Engineering,1995,9(3):42-46.(in Chinese))