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时间:2019-05-13
《水泥粉煤灰搅拌桩复合地基沉降特性研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第39卷,第5期公路工程Vo1.39,No.52014年10月HighwayEngineeringOct.,2014水泥粉煤灰搅拌桩复合地基沉降特性研究鞠兴华,赵丽娅,杨晓华(1.陕西铁路工程职业技术学院,陕西渭南714000;2.长安大学公路学院,陕西西安710064)[摘要】针对渭蒲高速公路饱和黄土地基用水泥粉煤灰搅拌桩加固路段,采用埋设沉降杯法进行了长期的现场监{受I。通过分析监测数据,得出了复合地基的沉降量、沉降速率随上部荷载和时间的变化趋势。同时结合实体工程中复合地基的各项参数,对其沉降量进行了理论计算和数值模拟。对比三种复合地基沉降量的分析方法得出:柔性荷载作用下复合地
2、基的理论计算因受桩体刺人下卧层长度、桩侧摩阻力等各种不确定因素的影响,不同理论计算方法的结果差异较大,实际意义不大;现场监测和数值模拟结果具有相似性,但是忽略了实际工程中次固结沉降对饱和黄土地基沉降的影响,故数值分析值偏小;针对饱和黄土的特殊工程性质,可将现场监测的结果与数值分析的规律结合起来,对复合地基的最终沉降进行预测。[关键词]饱和黄土;水泥粉煤灰搅拌桩;沉降监测;最终沉降量[中图分类号]Tu433[文献标识码]A[文章编号]1674—0610(2014)05oo71—04StudyoftheFly-ashCementMixingPileCompositeFoundation
3、SettlementCharacteristicsJUXinghua;ZHAOLiya;YANGXiaohua(1.ShaanxiRailwayInstitute,Weinan,Shaanxi714000,China;2.HighwaySchool,Chang’anUni—versity,Xi’an,Shanxi710064,China)[Abstract]Aimingatthesectionwhichwasstrengthenedbyfly—ashcementmixingpileofsaturatedloessfoundationinWeinan—Puchengexpresswa
4、y,aburiedsettlementcupmethodhasbeenadoptedinfieldmonitoring.Accordingtothemonitoringdatasuchthinglikefoundationsubsidenceofcompositefoundationandthetrendofsettlementratewithupperloadandtimehasbeengot.Thentheoreticalcalcu-lationandnumericalsimulationhasbeencombinedtostudyonthefoundationsubsiden
5、ceofcompositefoundationinentitativeengineeringwithitsparameters.Theresultsshowthattheresultswasquitediffer-entinupperthreetheoreticalcalculationmethods,becauseofitwasaffectedbyallkindsofuncertaintyfactorssuchaspilelengthwhichPiercingtheunderlyinglayerandPileshaftresistance.Anditsactualsignific
6、ancewasnotvery.Theresultsoffieldmonitoringclosertothatofnumericalsimulation,butthevalueofnumericalsimulationwassmallforsomethinglikesaturatedloessfoundationafectedbyseconds-ryconsolidationsettlementhasbeenneglected.Basedonthespecialengineeringpropertyofsaturatedlo—ess,thefinalsettlementofcompo
7、sitefoundationcanbeforecastedbywhichcombinedwiththeresultoffieldmonitoringandthedisciplineofnumericalsimulation.[Keywords]saturatedloess;fly-ashcementmixingpile;subsidencemonitoring;ultimatesettle—ment载力低、抗剪强度低、沉降量大及沉降不均匀等不良0引言的工程性质,易使饱
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