尾矿粗细颗粒分层结构体的力学特性分析
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摘要
利用室内三轴试验和直接剪切试验,研究尾矿粗细颗粒分层结构体的力学特性,包括尾矿粗细颗粒2层结构和3层结构,同时考虑分层厚度变化的影响。三轴试验结果显示:分层结构体的内聚力一般比单一粗粒尾矿和细粒尾矿的低,内摩擦角介于单一细粒尾矿和粗粒尾矿的之间;在2层结构中,试件的内聚力随着粗粒尾矿层厚度的增加而减小,内摩擦角随着粗粒尾矿层厚度的增加而增大;在3层结构中,粗粒尾矿作夹层时,结构体的内聚力随着夹层厚度的增加而显著减小,以细粒尾矿作夹层时,结构体的内摩擦角随着夹层厚度的增加而减小。直接剪切试验结果显示:分层结构体的内聚力和内摩擦角均比粗粒尾矿和细粒尾矿的值低。
Indoor triaxial tests and direct shear tests are adopted to study the mechanical characteristic of coarse and fine particle layered structure of tailings,including two-and three-layer structures,and the influence of the change of lay thickness is taken into account.Triaxial tests results show that hierarchical structure's cohesions,generally,are lower than those of fine and coarse particle tailings,and internal friction angles are between the fine and coarse particle tailings'.For the two-layer structure,the specimen's cohesion reduces and internal friction angle increases with the increase of coarse particle tailings' layer thickness.For the three-layer structure,when the coarse particle tailing is the interlayer,the specimen's cohesion reduces with the increase of interlayer thickness;while when the fine tailing is the interlayer,the specimen's internal friction angle decreases with the increase of interlayer thickness.Direct shear tests results show that hierarchical structure's cohesions and internal friction angles are all lower than those of coarse and fine particle tailings.
Indoor triaxial tests and direct shear tests are adopted to study the mechanical characteristic of coarse and fine particle layered structure of tailings,including two-and three-layer structures,and the influence of the change of lay thickness is taken into account.Triaxial tests results show that hierarchical structure's cohesions,generally,are lower than those of fine and coarse particle tailings,and internal friction angles are between the fine and coarse particle tailings'.For the two-layer structure,the specimen's cohesion reduces and internal friction angle increases with the increase of coarse particle tailings' layer thickness.For the three-layer structure,when the coarse particle tailing is the interlayer,the specimen's cohesion reduces with the increase of interlayer thickness;while when the fine tailing is the interlayer,the specimen's internal friction angle decreases with the increase of interlayer thickness.Direct shear tests results show that hierarchical structure's cohesions and internal friction angles are all lower than those of coarse and fine particle tailings.
引文
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[3]BHATTACHARYA A,ROUTHA J,GUNNAR J,et al.Environmental assessment of abandoned minetailings in Adak,Vsterbotten district(northernSweden)[J].Applied Geochemistry,2006,21(10):1760-1780.
[4]RICO M,BENITO G,SALGUEIRO A R,et al.Reported tailings dam failures:A review of theEuropean incidents in the worldwide context[J].Journal of Hazardous Materials,2008,152(2):846-852.
[5]NIEKERK H J V,VILJOEN M J.Causes andconsequences of the merriespruit and other tailings-damfailures[J].Land Degradation&Development,2005,16(2):201-212.
[6]徐宏达.我国尾矿库病害事故统计分析[J].工业建筑,2001,31(1):69-71.XU HONG-DA.Statistical analysis of tailings pondaccidents in China[J].Industrial Architecture,2001,31(1):69-71.
[7]敬小非,尹光志,魏作安,等.模型试验与数值模拟对尾矿坝稳定性综合预测[J].重庆大学学报,2009,32(3):308-313.JING XIAO-FEI,YIN GUANG-ZHI,WEI ZUO-AN,et al.Model test and numerical simulation of tailingdam safety forecasting[J].Journal of ChongqingUniversity,2009,32(3):308-313.
[8]王涛,侯克鹏,郭振世,等.层次分析法(AHP)在尾矿库安全运行分析中的应用[J].岩土力学,2009,29(增刊):680-686.WANG TAO,HOU KE-PENG,GUO ZHEN-SHI,et al.Application of analytic hierarchy process totailings pond safety operation analysis[J].Rock andSoil Mechanics,2009,29(suppl):680-686.
[9]WEI Z A,YIN G Z,LI G Z,et al.Reinforced terracedfields method for fine tailings disposal[J].MineralsEngineering,2009,22(12):1053-1059.
[10]WU J,WU Y Q,LU J,et al.Field investigations andlaboratory simulation of clogging in Lixi tailings dam ofJinduicheng,China[J].Environ Geol,2007,53(2):387-397.
[11]李作章,徐日升,穆鲁生,等.尾矿库安全技术[M].北京:航空工业出版社,1996.
[12]袁晓铭,孙锐.饱和砂土透镜体液化对建筑物地震反应的影响[J].地震工程与工程振动,2000,20(1):69-74.YUAN XIAO-MING,SUN RUI.Effect of liquefactionseismic of lenticular saturated sand zone on response ofbuildings[J].Earthquake Engineering and EngineeringVibration,2000,20(1):69-74.
[13]JIANG W D.Fractal character of lenticles and itsinfluence on sediment state in tailings dam[J].Journalof Central South University of Technology,2005,12(6):753-756.
[14]LO R C,KLOHN E J,FINN W D L.Stability ofhydraulic sandfill tailings dams[J].GeotechnicalSpecial Publication,1988,21:549-572.
[15]李夕兵,蒋卫东,贺怀建.尾矿堆积坝透镜体分布状态研究[J].岩土力学,2004,25(6):947-949.LI XI-BING,JIANG WEI-DONG,HE HUAI-JIAN.Study on distributing state of lenticle in tailings filldam[J].Rock and Soil Mechanics,2004,25(6):947-949.
[16]袁聚云.土工试验与原理[M].上海:同济大学出版社,2003.
[17]尹光志,杨作亚,魏作安,等.羊拉铜矿尾矿料的物理力学性质[J].重庆大学学报:自然科学版,2007,30(9):117-122.YIN GUANG-ZHI,YANG ZUO-YA,WEI ZUO-AN.Physical and mechanical properties of Yang La-copper’stailing[J].Journal of Chongqing University:NaturalScience Edition,2007,30(9):117-122.
[18]王崇淦,张家生.某尾矿料的物理力学性质试验研究[J].矿冶工程,2005,25(2):19-22.WANG CHONG-GAN,ZHANG JIA-SHENG.Experimental study on physical and mechanicalproperties of tailings[J].Mining and MetallurgicalEngineering,2005,25(2):19-22.
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