尾矿砂结构特征对渗透性影响的数值模拟
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摘要
为了探究尾矿砂结构特征对其渗透性的影响,以尾矿砂圆柱模型为研究对象,采用FLUENT对不同实验条件下的尾矿砂圆柱渗透系数进行数值模拟,验证了数值模拟方法在求解渗透系数时的有效性。通过研究不同结构特征因素对尾矿砂圆柱渗透系数的影响,得出了渗透系数和颗粒直径、孔隙率之间的规律。在孔隙率固定不变的情况下,渗透系数和颗粒直径的平方近似呈正比关系;在颗粒直径不变的情况下,渗透系数和孔隙率的三次方成正比关系。极差分析结果显示,颗粒直径是影响渗透系数较大的因素,次因为孔隙率,且两者的影响都表现出正相关性。
In order to investigate the influence of tailings structural features to its permeability,and with the tailings cylindrical model as the research subject,the FLUENT software was used to simulate the permeability coefficient of tailings cylinder to validate the reliability for obtaining permeability coefficient under the simulating experiment conditions. Through investigating the effect of different structure factor on permeability coefficient of tailings cylinder,the regularity among the permeability coefficient,the particle diameter and porosity was obtained. The permeability coefficient is almost in direct proportion to the square of the particle size when the porosity of tailings is constant. The permeability coefficient is almost in direct proportion to the cube of the particle size when the particle size is constant. The range analysis suggests that the particle size of tailings is the key element to affect the permeability coefficient,following by the porosity. Both of them show a positive correlation with the permeability coefficient.
In order to investigate the influence of tailings structural features to its permeability,and with the tailings cylindrical model as the research subject,the FLUENT software was used to simulate the permeability coefficient of tailings cylinder to validate the reliability for obtaining permeability coefficient under the simulating experiment conditions. Through investigating the effect of different structure factor on permeability coefficient of tailings cylinder,the regularity among the permeability coefficient,the particle diameter and porosity was obtained. The permeability coefficient is almost in direct proportion to the square of the particle size when the porosity of tailings is constant. The permeability coefficient is almost in direct proportion to the cube of the particle size when the particle size is constant. The range analysis suggests that the particle size of tailings is the key element to affect the permeability coefficient,following by the porosity. Both of them show a positive correlation with the permeability coefficient.
引文
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[3]宋志飞,王群,赵雪芳,等.某尾矿坝稳定性数值分析[J].工业安全与环保,2015,41(1):40-43.Song Zhifei,Wang Qun,Zhao Xuefang,et al.Numerical analysis of the stability of tailings dam[J].Industrial Safety and Environmental Protection,2015,41(1):40-43.
[4]Cukrowska E M,Govender K,Viljoen M.Ion mobility based on column leaching of South African gold tailings dam with chemometric evaluation[J].Chemosphere,2004,56(1):39-50.
[5]李守巨,刘迎曦,孙伟,等.多孔材料孔隙尺寸对渗透系数影响的数值模拟[J].力学与实践,2010,32(4):12-17.Li Shouju,Liu Yingxi,Sun Wei,et al.Numerical simulation of relationship between hydraulic conductivity and porosity geotechnical materials[J].Mechanics in Engineering,2010,32(4):12-17.
[6]曾晟,杜雪明,孙冰,等.低渗透含铀砂岩压力梯度-黏度-化学耦合渗流规律实验研究[J].原子能科学技术,2015,49(8):1521-1528.Zeng Sheng,Du Xueming,Sun Bing,et al.Experimental study on the pressure gradient-viscosity-chemical coupling permeability feature of the low permeable sandstone uranium ore rock[J].Atomic Energy Science and Technology,2015,49(8):1521-1528.
[7]丁德馨,李广悦,徐文平,等.松散破碎介质中液体饱和渗流规律研究[J].岩土工程学报,2010,28(2):180-184.Ding Dexin,Li Guangyue,Xu Wenping,et al.Regularities for saturated water seepage in loose fragmented medium[J].Chinese Journal of Geotechnical Engineering,2010,28(2):180-184.
[8]胡寒桥,谭凯旋,吕俊文,等.铀尾矿氡析出率的Hurst指数与分形特征[J].南华大学学报:自然科学版,2010,24(4):5-10.Hu Hanqiao,Tan Kaixuan,Lv Junwen,et al,Fractal character sand Hurts Exponent of radon exhalation rate from uranium tailings[J].Journal of university of south China:Science and Technology,2010,24(4):5-10.
[9]李亨,张锡文,何枫.论多孔介质中流体流动问题的数值模拟方法[J].中国石油大学学报,2000,24(5):111-116.Li Heng,Zhang Xiwen,He Feng.Development of numerical simulation methods for fluid flow in porous media[J].Journal of the University of Petroleum,2000,24(5):111-116.
[10]谢清芳,彭小勇,万芬,等.植被覆盖对铀尾矿库氡大气扩散影响的数值模拟[J].安全与环境学报,2013,13(6):264-268.Xie Qingfang,Peng Xiaoyong,Wan Fen,et al.Numerical simulation of the influence of vegetation-covered area on the atmospheric diffusion of radon emanating from the uranium tailings impoundment[J].Journal of Safety and Environment,2013,13(6):264-268.
[11]叶勇军,丁德馨,李广悦,等.堆浸铀矿堆液体饱和渗流规律的研究[J].岩土力学,2013,34(8):2243-2248.Ye Yong Jun,Ding Dexin,Li Guangyue,et al.Regularities for liquid saturated seepage in uranium ore heap for heap leaching[J].Rock and Soil Mechanics,2013,34(8):2243-2248.
[12]刘杰,徐曾和,闫虎城,等.颗粒堆积型多孔介质非线性渗流的试验研究[J].金属矿山,2014(4):165-168.Liu Jie,Xu Zenghe,Yan Hucheng,et al.Experimental research on nonlinear seepage of porous media of pellets packing[J].Metal Mine,2014(4):165-168.
[13]孔祥言.高等渗流力学[M].合肥:中国科学技术大学出版社,1999.Kong Xiangyan.Advanced Mechanics of Fluid in Porous Media[M].Hefei:University of Science and Technology of China Press,1999.