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时间:2020-03-25
《通平高速公路红砂岩崩解的微观特性.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、第28卷第10期2011年10月公路交通科技JournalofHighwayandTransportationResearchandDevelopmentV01.28No.10Oct.20lldoi:10.3969/j.issn.1002—0268.2011.10.002通平高速公路红砂岩崩解的微观特性刘晓明1,熊力1,罗卫华2(1.湖南大学土木工程学院,湖南长沙410082;2.湖南省通平高速公路建设开发有限公司,湖南平江414500)摘要:针对通平高速公路的红砂岩虽然可归类为IIl类岩但其仍具
2、崩解性的特点,从成分、晶体形貌等微观角度研究了该路段红砂岩崩解特性。矿物成分分析结果表明该路段红砂岩所合粘土矿物为绿泥石,而非蒙脱石、高岭石、伊利石这3种常见粘土矿物。浸水膨胀试验表明该路段红砂岩虽然可崩解但是不具有膨胀性。对崩解前后的红砂岩成分、晶体形貌的粉晶XRD、透射电镜和电子衍射试验表明该路段红砂岩的崩解主要是非晶质的胶结物流失所致。研究解释了该路段红砂岩崩解特性的特殊性,深化了对红砂岩的认识。在此基础上,提出该路段红砂岩切方区可不换填的处治原则。关键词:道路工程;红砂岩;崩解;绿泥石;微
3、观结构中图分类号:U416.1+6.03文献标识码:A文章编号:1002—0268(2011)lO一0007—05MicroCharacteristicsofDisintegrationofRedSandstoneofTongcheng—PingjiangExpresswayLIUXiaomin91,XIONGLil,LUOWeihua2(1.CollegeofCivilEngineering,HunanUniversity,ChangshaHunan410082,China;2.HunanPro
4、vincialTongcheng—PingiiangExpresswayConstructionandDevelopmentCo.,Ltd,PingjiangHunan414500,China)Abstract:AlthoughtheredsandstoneofTongcheng—PingjiangexpresswaycanbeclassifiedasrockofclassIlI,thesandstonestillhasthepropertyofdisintegration.Thedisinteg
5、ratingpropertyoftheredsandstonewasresearchedfromthemicro—perspectiveaspectofcompositionandcrystalmorphology.TheresultofrockmineralcompositionanalysisshowthatthemainclaymineralscontainedintheredsandstoneischloritebutnotthecommonmineralsofMontmorillonit
6、e,kaoliniteandillite.Theresultofsoakingandexpansiontestshowsthatdespitetheredsandstoneexhibitingsomekindsofdisintegratingproperties,thiskindofstonehardlyexpandingwhendisintegrating.Comparativeanalysisonchemicalcompositionoftheredsandstoneandcrystalmor
7、phologycharacteristicsbypowderXRDmethod,TEMandElectrondiffractionmethodshowthatthemaincauseofdisintegrationoftheredsandstoneisamorphousmineralloosingratherthanclaymineralexpansionwhenabsorbingwater.Theresearchexplainedtheparticularityofthedisintegrati
8、ngpropertyoftheredsandstone,anddeepenedtheunderstandingoftheredsandstone.Finally,theoptimizedtreatmentprincipleforcuttingsectionoftheredsandstoneWasputforward,thatis,forTongcheng-Pingjiangexpressway,itisunnecessarytoadoptthereplacementmethodto
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