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《软土真空预压处理有效性的宏微观分析.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32卷增1岩石力学与工程学报Vo1.32Supp.12013年1月ChineseJournalofRockMechanicsandEngineeringJan.,2013软土真空预压处理有效性的宏微观分析莫海鸿,王婧~,林奕禧f1华南理工大学土木与交通学院,广东广9II510641;2华南理工大学亚热带建筑科学国家重点实验室,广东广州5106413珠海市建设工程质量监督检测站,广东珠海519015)摘要:地基处理前分析软土宏微观性质对预测真空预压法处理的有效性具有重要意义。通过室内宏微观试验,对珠海金湾地
2、区软土矿物成分、比表面积,以及固结前后的微观结构、孔隙特征等进行分析和研究,得出土体结合水量、强度指标等影响真空预压法处理效果的关键因素。研究结果表明,珠海金湾软土黏土矿物成分含量不高,且黏胶粒占50%,比表面积较黏土矿物小;颗粒呈曲片絮凝状叠聚体,固结变形后出现团聚现象,孔隙压密,无颗粒破碎形状变化;微孑L隙尺寸分布主要为400nm3、显。关键词:土力学;软土;宏微观;真空预压;固结中图分类号:Tu43文献标识码:A文章编号:1000—6915(2013)增1—2692—06MACRoANDMICRoANALYSESoFEFFECTIVENESSBYVACUUMPRELoADINGTREATMENToFSoFTSoILMOHaihong~,WANGJing’。,LINYixir1.SchooloyOvilEngineeringandTransportation,SouthChinaUniversityofTechnology,Guangz4、hou,Guangdong510641,China;2.StateKeyLaboratoryofSubtropicalBuildingScience,SouthChinaUniversityofTechnology,Guangzhou,Guangdong510641,China;3.ZhuhaiMunicipalConstructionEngineeringQualitySupervisionandTestStation,Zhuhai,Guangdong519015,China)Abstract:Thema5、croandmicroanalysesofsoftsoilbeforefoundationtreatmentareimportanttopredicttheeffectivenessofvacuumpreloadingtreatment.Throughthelaboratorymacroandmicrotests,thepropertiesofsoftsoilfromZhuhaiJinwanareaareinvestigated,includingmineralcomposition,specificsur6、facearea,microstructure,porepropertiesbeforeandafterconsolidation,etc—Thekeyfactorsareconcludedwhichindicatevacuumpreloadingtreatmenteriect,suchasamountofboundwater,strengthindex.Researchresultshowsthatclaycontentofsoftsoil仔omZhuhaiJinwanareaiSnothigh,with7、theclaycontentabout50%:andspecificsurfaceareajSsmal1.Thesoftsoilgrainsarecurvedflocculationpolymer.Afterconsolidation,microscopicstructurehasnoticeablyaggregatedwithcompactnessandnoparticlebreaking.Themicro。poredistributioniSmainlybetween400and2500nm.Thecu8、mulativeintrusionssharplydecreaseafterconsolidation,andporesturnsmaller.Therefore,theamountofboundwaterisnothighwithmorefreewater.111echangeofinternalfrictionangleisnotbig,andcohesionhaslargergrowth.Itshowsgo
3、显。关键词:土力学;软土;宏微观;真空预压;固结中图分类号:Tu43文献标识码:A文章编号:1000—6915(2013)增1—2692—06MACRoANDMICRoANALYSESoFEFFECTIVENESSBYVACUUMPRELoADINGTREATMENToFSoFTSoILMOHaihong~,WANGJing’。,LINYixir1.SchooloyOvilEngineeringandTransportation,SouthChinaUniversityofTechnology,Guangz
4、hou,Guangdong510641,China;2.StateKeyLaboratoryofSubtropicalBuildingScience,SouthChinaUniversityofTechnology,Guangzhou,Guangdong510641,China;3.ZhuhaiMunicipalConstructionEngineeringQualitySupervisionandTestStation,Zhuhai,Guangdong519015,China)Abstract:Thema
5、croandmicroanalysesofsoftsoilbeforefoundationtreatmentareimportanttopredicttheeffectivenessofvacuumpreloadingtreatment.Throughthelaboratorymacroandmicrotests,thepropertiesofsoftsoilfromZhuhaiJinwanareaareinvestigated,includingmineralcomposition,specificsur
6、facearea,microstructure,porepropertiesbeforeandafterconsolidation,etc—Thekeyfactorsareconcludedwhichindicatevacuumpreloadingtreatmenteriect,suchasamountofboundwater,strengthindex.Researchresultshowsthatclaycontentofsoftsoil仔omZhuhaiJinwanareaiSnothigh,with
7、theclaycontentabout50%:andspecificsurfaceareajSsmal1.Thesoftsoilgrainsarecurvedflocculationpolymer.Afterconsolidation,microscopicstructurehasnoticeablyaggregatedwithcompactnessandnoparticlebreaking.Themicro。poredistributioniSmainlybetween400and2500nm.Thecu
8、mulativeintrusionssharplydecreaseafterconsolidation,andporesturnsmaller.Therefore,theamountofboundwaterisnothighwithmorefreewater.111echangeofinternalfrictionangleisnotbig,andcohesionhaslargergrowth.Itshowsgo
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