夯实水泥土楔形桩复合地基工作性状试验研究-论文.pdf

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1、第43卷第5期中南大学学报(自然科学版)、，0l_43No．52012年5月JournalofCentralSouthUniversity(ScienceandTechnology)May2012夯实水泥土楔形桩复合地基工作性状试验研究何杰一，张可能，刘杰，吴有平，李冰(1．中南大学地球科学与信息物理学院，湖南长沙，410083；2．湖南工业大学土木工程学院，湖南株洲，412007)摘要：针对软土地基中的夯实水泥土桩复合地基，分别进行1组圆柱形桩和3组不同楔角楔形桩的9桩复合地基对比试验，研究这4组复合地基在相同条件下的桩一土平均沉降差

2、、桩体应力、平均桩一土应力比、平均沉降随荷载变化的规律。研究结果表明：夯实水泥土楔形桩能有效地调节桩～土沉降差和地基沉降，提高地基承载力；增大楔形桩的楔角能使桩体较早地发挥其承载性能：在一定荷载范围内，夯实水泥土楔形桩复合地基的平均桩一土应力比夯实水泥土圆柱形桩复合地基的平均桩一土应力比大；随着荷载的增加，桩体所分担的荷载是有限的，夯实水泥土楔形桩复合地基的平均桩一土应力增长趋于稳定或下降，即楔形桩的倾斜侧壁能有效地缓解桩体应力集中现象。关键词：楔形桩；夯实水泥土桩复合地基；桩一土沉降差；桩体应力；桩一土应力比中图分类号：TU473文献

3、标志码：A文章编号：1672—7207(2叭2)O5—1920-06Experimentalresearchonbearingbehaviorofcompositefoundationwithrammedsoil-cementtaperedpilesHEJie一，ZHANGKe．neng，LIUJie，WUYou．ping，LIBing(1．SchoolofGeosciencesandInfo-Physics，CentralSouthUniversity,Changsha410083，China；2．SchoolofCivilEngin

4、eering，HunanUniversityofTechnology,Zhuzhou412007，China)Abstract：Aimedatcompositefoundationwithrammedcement—soilpilesinsoftground，thecontrasttestsonagroupofcompositefoundationwithninerammedcylindricalcementsoilpilesandthreegroupsofcompositefoundationwithninerammedtaperedc

5、ement-soilpileswereperformedinlaboratory,respectively．Theaveragesettlementdiferenceamongpileandsoil，pilestress，averagepile-soilstressratioandtherelationshipbetweenloadandaveragesettlementoffourgroupsofcompositefoundationwithrammedcement-soilpileswererespectivelystudiedun

6、derthesamecondition．Theresultsindicatethatthediferentialsetlementbetweenpileandsoilcallbeadjustedbyrammedtaperedcement-soilpile，thegroundsettlementdecreasesanditsbearingcapacityisenhancedobviously．Thebearingbehavioroframmedtaperedcement-soilpilesinthecompositefoundationC

7、anbeexceedbyenhancingitstaper．Withinsomeloadscopes，theaveragepile．soilstressratioofcompositefoundationwithrammedtaperedcement-soilpilesishigherthanthatofcompositefoundationwithrammedcylindricalcement—soilpiles．Withtheincreaseofloadunceasingly,theloadsharedbytaperedpilesi

8、ncreasesrestrictedly,andtheaveragepile—soilstressratioofcompositefoundationwithrammedcement-soiltapered