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1、第34卷第8期巖土力學、,01.34No.82013年8月RockandSoilMechanicsAug.2013文章編號l1000-7598-(2013)08—2295一O8超細全尾砂材料膠凝成巖機理試驗徐文彬一,杜建華,宋衛(wèi)東,陳海燕(1.北京科技大學金屬礦山高效開采與安全教育部重點試驗室,北京100083;2.中國礦業(yè)大學(北京)資源與安全工程學院,北京,100083)摘要:礦山充填是保護土地資源、生態(tài)環(huán)境,實現(xiàn)礦山無廢開采和消除重大安全隱患的理想途徑。以某礦全尾砂為試驗材料,在分析該礦全尾砂材
2、料的化學成分、粒徑級配組成等基本物理、化學特性基礎上,借助XRD能譜分析和電鏡掃描(SEM)方法,得到不同條件下的超細全尾砂材料膠凝成巖微觀規(guī)律。對比以水泥、固結(jié)劑1和固結(jié)劑2分別為膠結(jié)劑時充填體的強度結(jié)果表明,在灰砂配比、濃度和齡期相同的條件下3種膠結(jié)材料充填體的強度大小為:固結(jié)劑1>固結(jié)劑2>水泥;固結(jié)劑1可替代水泥作為礦山全尾砂膠結(jié)充填的膠結(jié)劑,且價格比水泥便宜,有利于降低礦山充填成本。對不同條件下的充填體強度曲線進行擬合,得到充填體的單軸抗壓強度增長規(guī)律:在養(yǎng)護齡期28d之內(nèi),充填體單軸抗壓強
3、度增長規(guī)律隨齡期變化基本相同,皆遵循指數(shù)函數(shù)曲線增長規(guī)律;當以固結(jié)劑1、2分別作為膠結(jié)材料時,強度增長規(guī)律與水泥為膠結(jié)劑時相同;強度增長曲線趨勢與灰砂配比、料漿濃度以及養(yǎng)護齡期正相關(guān)。關(guān)鍵詞:全尾砂;微觀機制;新型膠結(jié)劑;強度規(guī)律中圖分類號:Tu44文獻標識碼:AExperimentonthemechanismofconsolidatingbackfillbodyofextra-finegrainunclassifiedtailingsandcementitiousmaterialsXUWen.bin
4、,,DUJian.hua,SONGWei—dong,CHENGHai—yan(1.KeyLaboratoryofHigh-EficientMiningandSafetyofMetalMinesofEducationMinistry,UniversityofScienceandTechnologyBeijing,Beijing100083,China;2.ChinaUniversityofMining&Technology,Beijing,F(xiàn)acultyofResources&SafetyEnginee
5、ring,Beijing,100083,China)Abstract:Minebackfillisanidealapproachtoprotectlandresources,ecologicalenvironment,toachievetheminemodeofno.waste.disehargedandeliminatethepotentialhazards.Theunclassifiedtailingsfromaminewasusedasexperimentalrawmaterial,thenth
6、emicro.mechanismofconsolidatingbackfillbodyofsuper-finenessunclassifiedtailingsandcementitiousmaterialsunderdiferentconditionsbymeansofXRDandSEMwereobtainedafteranalyzingthephysicalandchemicalproperties,thechemicalcomponentsandparticlesizecompositionoft
7、heunclassifiedtailings.Thecementingagenttype≠f1andtype≠}2weretakentoreplacetheregularcementandtheuniaxialcompressivestrength(ucs)ofbackfillspecimensweregained.TheexperimentalresultsshowedthattheinfluencedegreesofdiferentcementingagentsonthebehaviorsofUC
8、Swerediferent,whentheexternalexperimentalconditionsweresame;anditalmostobeyedthelaw:cementingagenttype1>cementingagenttype#2>cement.Thestudyalsodemonstratedthattheperformanceofthecementingagenttype撐1werebeRerthantheothers;anditsp