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时间:2019-05-11
《水平梯形分布荷载桩双参数法的数值解》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23卷第15期岩石力学与工程学报23(15):2632~26382004年8月ChineseJournalofRockMechanicsandEngineeringAug.,2004*水平梯形分布荷载桩双参数法的数值解1,221戴自航沈蒲生张建伟12(福州大学环境与资源学院福州350002)(湖南大学土木工程学院长沙410082)摘要为提高现有水平梯形分布荷载桩设计计算水平,提出了地基系数按双参数抗力模式表达下的水平梯形分布荷载桩位移和内力计算的有限差分数值分析方法,并详细推导了桩身位移的差分格式。基于这些公式,编制了
2、全桩位移、内力及侧土抗力的计算和图形处理程序,可适用于滑坡抗滑桩和深基坑悬臂支护桩的设计计算。算例表明,该方法方便可靠,当有限差分段划分得足够小时,可使数值解接近于真实解。通过调整地基系数进行试算,可实现桩身位移和内力计算结果与实测或实际值较好吻合,从而为有试桩资料的条件下反算地基抗力系数提供了一种验算方法。计算程序的自动图形处理有助于桩身结构设计的优化和经济效益的提高。关键词土力学,水平梯形分布荷载桩,位移,内力,侧土抗力,双参数法,有限差分法分类号TU473文献标识码A文章编号1000-6915(2004)15-26
3、32-07NUMERICALSOLUTIONOFPILESUNDERLATERALLOADOFTRAPEZOID-DISTRIBUTIONBYBIPARAMETERMETHOD1,221DaiZihang,ShenPusheng,ZhangJianwei1(CollegeofEnvironmentandResources,FuzhouUniversity,Fuzhou350002China)2(CollegeofCivilEngineering,HunanUniversity,Changsha410082China)Ab
4、stractInordertoimprovethedesignandcalculationoflaterallyloadedpiles,numericalanalyticalmethodoffinitedifferenceisproposedwhichcancalculatedisplacementsandinternalforcesofpilesunderlateralloadoftrapezoiddistributionbasedonbiparametermodeoffoundationcoefficient.The
5、finitedifferenceformulationsofdisplacementsofpilesarededucedindetails.Basedontheseformulations,computationandvisualizationprogramsofdisplacements,internalforcesofpilesandsoilreactionaredevelopedfordesigncalculationsofanti-slidingpilesandcantileversoilretainingpil
6、esfordeepfoundationpits.Theexamplesshowthatthismethodisconvenientandreliable.Numericalsolutionsareclosetorealsolutionswhendifferentialsegmentsaresmallenough.Calculationresultsofdisplacementsandinternalforcescanperfectlycoincidewithmeasurementsandpracticalvaluesby
7、trialcomputationswithfoundationcoefficientsadjusted.Thismethodisusedtoobtainthefoundationresistantcoefficientsbyback-calculationwiththedataoftestingpilesgiven.Theautomaticvisualizationbythecomputerprogramishelpfultotheoptimizationofstructuraldesignandhencetheecon
8、omicbenefits.Keywordssoilmechanics,pilesunderlateralloadoftrapezoid-distribution,displacement,internalforce,soilreaction,biparametermethod,finitedifferencemeth
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