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ID:52271712
大小:2.06 MB
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时间:2020-03-26
《铁矿尾矿料力学特性及坝体变形稳定性研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、JournalofEngineeringGeology工程地质学报1004-9665/2015/23(6)118907DOI:10.13544/j.cnki.jeg.2015.06.021铁矿尾矿料力学特性及坝体变形稳定性研究张鹏伟吴辉胡黎明夏志然臧沛渊(水沙科学与水利水电工程国家重点实验室,清华大学北京100084)摘要尾矿料矿物成分复杂,物理力学特性区域差异性大。本文以西南地区某铁矿拟建尾矿库为研究对象,对粗、细两种尾矿料进行了系统的物理力学特性试验,获得了粗细尾矿料物理力学指标并应用到尾矿库坝数值分析,分析了该尾矿库坝的应力变形
2、特性,对不同堆积高程、不同工况下尾矿库坝的安全稳定性进行计算分析。此外采用拟静力法对地震荷载作用下尾矿坝的稳定性进行分析。结果表明,粗尾矿料会呈现出剪胀和软化力学特性,而细尾矿料则无明显剪胀;尾矿坝坝体内以压应力为主,坝体表面出现小范围拉应力区;高堆积高程,坝体倾向于发生深层滑动,坝体最小安全稳定性系数较大;干滩长度增大明显提高坝体稳定性;最后对该尾矿库的安全运行提出了一些针对性措施及建议。关键词尾矿坝力学特性坝体变形稳定性分析拟静力分析+中图分类号:TU441.35文献标识码:AMECHANICALCHARACTERISTICSOFIRO
3、NMINETAILINGMATERIALSANDANALYSISONDEFORMATIONANDSTABILITYOFTAILINGDAMZHANGPengweiWUHuiHULimingXIAZhiranZANGPeiyuan(StateKeyLaboratoryofHydroscienceandEngineering,TsinghuaUniversity,Beijing100084)AbstractStabilityevaluationoftailingdamisthekeyprocedurefortailingpondconstru
4、ction.Themineraltypesoftailingsarequitecomplex,andareregionaldependent.Thecharacteristicsoftailingsarelargelyaffectedbymineraltypes,producingprocessesanddepositedenvironments.Thispaperexaminesanongoingdesignedironminetailingspond.ItlocatesatSouthwesternChina.Specifically,t
5、hispaperconductsalargenumberofphysicalandmechanicalexperimentsforcoarseandfinetailingmaterials,andobtainedphysicalandmechanicalparametersandappliesthemintotailingdamnumericalsimulation.Itanalyzesthestressanddeformationpropertiesofthistailingdam,andstabilityatdifferentdepos
6、itelevationsanddifferentoperationconditions.Furthermore,thequasistaticmethodisadoptedtoanalyzethedynamicresponseoftailingdamunderearthquakecondition.Resultsshowthatcoarsetailingspresentdilatancyandsofteningproperties.Incontrast,thedilatancyoffinetailingsisnotapparent.Comp
7、ressivestressiscommonlypresentinsidetailingdam.Thereisasmallparttensilestressareathatappearsonthesurfaceoftailingdam.Tailingdamtendstohappendeepslideathigherdepositelevationconditions.Additionally,thelengthofdrybeachhassignificanteffectsondamstability.Theratioofdamstabili
8、tyincreases收稿日期:2014-11-18;收到修改稿日期:2015-06-04.基金项目:国家自然科学基金项目(No.50978139,No.51128901,No
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