麦秸秆的力学性能及加筋滨海盐渍土的抗压强度研究.pdf

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1、JournalofEngineeringGeology工程地质学报1004—9665／2009／17(4)-0545-05麦秸秆的力学性能及加筋滨海盐渍土的抗压强度研究李敏①柴寿喜②魏丽②(①西部灾害与环境力学教育部重点实验室(兰州大学)兰州730000)(②天津城市建设学院天津市软土特性与工程环境重点实验室天津300384)摘要为开展天然草本纤维材料防腐前后的力学性能及加筋滨海盐渍土的抗压强度增长规律研究，本文探讨了麦秸秆的微结构特征及防腐方法、测试并对比了防腐前后的麦秸秆的质量增加率、吸水率、极限拉力和极限

2、延伸率，证实用sH胶浸泡麦秸秆不仅能起到防腐作用，还可提高麦秸秆的力学性能。完成了不同加筋长度、不同加筋率及浸胶后呈不同状态麦秸秆的加筋滨海盐渍土无侧限抗压强度试验，结果证实：掺加长10ram麦秸秆优于掺加长20mill麦秸秆；适宜加筋率为0．3％一0．4％；掺加浸泡sH胶后呈潮湿状态的麦秸秆优于掺加浸泡sH胶后呈干燥状态的；麦秸秆加筋盐渍土的抗压强度高于素盐渍土。初步的研究结果表明，麦秸秆适宜作加筋材料使用。关键词加筋土麦秸秆无侧限抗压强度滨海盐渍土加筋材料SH固土剂地基处理中图分类号：P642文献标识码：A

3、MCHANICALPRoPERTmSoFⅥ佃【EATSTRAWANDSTRENGTHoFITSREDoRCEDSHoRESALDESoILUMin①CHAIShouxi②WEIh②(①研／aborawryofMedum／~OnD／sasterandE,~nment／nWesternOr／ha(Zo／ighouUn／wgv)，M~m／stryofEducat／on-／．anzhou7300O0)(②／'tanj／n研LaboratoryofSo／Otaraaer／a／csandEng／neer／ngEnv／ron

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6、otonlyprotectitfromCOITOS—ivenessIbutalsoimproveitsmechanicalproperties．111eresultsofunconfinedcompressivestrengthtestofdiferentlengthsandaddingratiosofwheatstraw-andconditionsaftersoakingagentshowthattheunconfinedcompressivestrengthofreinforcedsoilwithlOmml

7、ongwheatstrawishigherthanthatofthe20mmlongwheatstraw．Thesuit—ableaddingratioisabout0．3％一0．4％inweight．rI1lemixturewithwheatstrawinwetconditionaftersoakingSHagentisbetterthanthatindrycondition．111estrengthofreinforcedsalinesoilininshorewithwheatstrawishigherth

8、antheoriginalsalinesoil．Preliminaryresultsshowthatwheatstrawissuitableforusingasthereinforcement．KeywordsReinforcedsoil，Wheatstraw，Unconfinedcompressivestrength。Salinesoil，Inshore-Reinforcementm