刚性组合桩复合地基沉降特性的试验研究.pdf

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1、第25卷第12期中国矿业Vol_25，No．122016年I2月CHINAMININGMAGAZINEDec．2O16刚性组合桩复合地基沉降特性的试验研究张丽华，蔡景珞，叶泽川，张昌进，刘海波(华北科技学院建筑工程学院，河北三河101601)摘要：为了进一步探索刚性组合桩复合地基的沉降规律，设计了模型试验加载系统及实验箱，进行了十二组刚性组合桩复合地基试验研究，分别在长短桩共同加区、短桩与下卧层交接面、仅有长桩加固区、长桩与下卧层交接面埋设了沉降标，测得了长短桩组合的复合地基在不同深度处随桩长、桩径、桩距变化的沉

2、降规律，分析了长短桩共同加固区、仅有长桩的加固区、长短桩与下卧层交接处、同一深度处不同影响因素沉降特征及同一影响因素不同深度处的沉降特征。试验结果表明：长桩桩长主控效果显著，长桩桩长、桩径、桩距对沉降影响在长短桩共同加回区表现更为突出，在仅有长桩加固区各影响因素对沉降影响差异不大。关键词：复合地基；刚性组合桩；试验研究；沉降规律中图分类号：TU433文献标识码：A文章编号：1004—405I(2016)12-0128—04Experimentalstudyonsettlementcharacteristicsof

3、rigidpilecompositefoundationZHANGLihua，CAIJingluo，YEZechuan，ZHANGChangjin，LIUHaibo(SchoolofCivilEngineering，NorthChinaInstituteofScienceandTechnology，Sanhe065201，China)Abstract：InordertOfurtherexplorethesettlementregularityofrigidcompositepilecompositefoundat

4、ion．Experimenton12groupsofrigidcombined—pilecompositefoundationsarestudiedbasedonthedesignedmodeltestloadingsystemandexperimentalbox．Settlementstandardareembeddedinthelong—shortpilescombinedreinforcedarea，theinterfacebetweenshortpileandsubsoil，longpilereinfor

5、cedareaandtheinterfacebetweenpongpileandsubstratum．Thesettlementlawoflong—shortpilecombinedcompositefoundationwithdifferentpile—length，pile—diameterandpile—spacingofismeasuredatdifferentdepths．Inaddition，thesettlementcharacteristicsofdifferentinfluencingfacto

6、rsatthesamedepthanddifferentdepthsforthesamefactorsareanalyzedinthelong—shortpilescombinedreinforcedarea，theinterfacebetweenshortpileandsubsoil，longpilereinforcedareaandtheinterfacebetweenpongpileandsubstratum．Itcanbeconcludedthat，themaineontro1effectofthesqu

7、arepilelengthisremarkable．Effectofpilelength，pilediameterandpilespacingonthesettlementismoreobviousinthelong—shortpilescombinedreinforcedarea．However，therearenosignificantdifferencesintheinfluenceofparametersabovementionedonthesettlementoflongpilereinforcedar

8、ea．Keywords：compositefoundation；rigidcompositepile；experimentalstudy；settlementregularity高层及超高层建筑发展，使得在复合地基处理桩复合地基沿深度方向沉降变化规律进行了试验设计中，地基变形控制这一设计目标越来越重要。研究，力求更进一步探索总沉降规律、长短桩加固在复合地基中组合桩复合地基