软土水泥搅拌桩复合地基沉降特性试验研究-(完整版)实用资料.doc

软土水泥搅拌桩复合地基沉降特性试验研究-（完整版）实用资料
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第40卷第3期中南大学学报(自然科学版Vol.40No.32021年6月JournalofCentralSouthUniversity(ScienceandTechnologyJun.2021软土水泥搅拌桩复合地基沉降特性试验研究
胡贺松1,2,彭振斌1,杨坪3,杨庆光4,彭文祥1
(1.中南大学地学与环境工程学院,湖南长沙,410083;
2.广州市建筑科学研究院,广东广州,510440;
3.同济大学地下建筑与工程系,上海,200092;
4.湖南工业大学岩土工程研究所,湖南株洲,412021
摘要:为了分析软土水泥搅拌桩复合地基沉降特性,通过现场载荷试验,对软土单桩和四桩水泥搅拌桩复合地基沉降特性进行试验研究。试验结果表明:对于不同的荷载等级,单桩和四桩水泥搅拌桩复合地基沉降可分为快速沉降和缓慢沉降2个阶段;在快速沉降阶段,沉降量可达到本级荷载下复合地基沉降量的90%左右,而在缓慢沉降阶段,沉降量只占本级荷载下的10%;在不同荷载水平下,单桩沉降量比与时间的关系和四桩复合地基的沉降量比与时间的关系相似;其复合地基沉降量与时间的关系可以用Hill模型进行描述。
关键词:软土;水泥搅拌桩;复合地基;沉降
中图分类号:TU411文献标识码:A文章编号:1672−7207(202103−0803−05
Settlementcharacteristicofcompositefoundationfor
cementmixingpilesinsoftsoil
HUHe-song1,2,PENGZhen-bin1,YANGPing3,YANGQing-guang4,PENGWen-xiang1
(1.SchoolofGeologyandEnviromentalEngineering,CentralSouthUniversity,Changsha410083,China;
2.GuangzhouInstituteofBuildingScience,Guangzhou510440,China;
3.DepartmentofGeotechnicalEngineering,TongjiUniversity,Shanghai200092,China;
4.GeotechnicalEngineeringInstitute,HunanUniversityofTechnology,Zhuzhou412021,China
Abstract:Inordertoanalyzethesettlementcharacteristicofcompositefoundationforcementmixingpilesinsoftsoil,thesettlementcharacteristicsofcompositefoundationforsingleandfourcementmixingpilesinsoftsoilwereanalyzedbyloading.Thetestresultsshowthatthesettlementofcompositefoundationforsingleandfourcementmixingpiles,underdifferentloads,includestwostages,i.e.,quicksettlementandslowsettlement.Atthestageofthequicksettlement,compositefoundationsettlesfast.90%ofthetotalsettlementfortheloadingtakesplaceduringthequicksettlement,andtheremaining10%ofthesettlementoccursduringtheslowsettlement.Indifferentloadstagesbutinthesameperiod,therelationofsettlementratioandtimeofcompositefoundationforsingleandfourcementmixingpilesissimilar.TherelationshipbetweensettlementandtimecanbedescribedbyHillmodel.
Keywords:softsoil;cementmixingpiles;compositefoundation;settlement
目前,人们对复合地基沉降的研究远少于对复合地基承载力的研究,也远远落后于工程实践的需要,复合地基沉降计算理论还不成熟,因此,对复合地基沉降量进行计算和预测是