第5卷第1期地基处理Vol.5No.12023年1月JournalofGroundImprovementJan.2023锚杆(索)荷载-位移曲线拟合及极限承载力分析吴江斌,罗岚,刘威(华东建筑设计研究院有限公司,上海200002)摘要:类比工程桩抗压荷载-位移曲线(P-S曲线)研究方法,采用指数模型和双曲线模型对锚杆(索)基本试验P-S曲线进行分析。依托红河综合交通枢纽项目基本试验P-S曲线数据,采用两种模型预测锚杆(索)极限承载力,发现指数模型对极限承载力的预测结果偏于安全。按相关规范要求,锚杆(索)基本试验需在初始荷载的基础上进行循环试验。进行试验数据处理时,可以消除初始荷载后拟合,也可直接进行拟合。采用指数模型预测极限承载力时,消除初始荷载后的拟合结果偏于安全。在拟合的基础上,按规范规定的加载条件及破坏条件判断出破坏荷载,可得到修正极限值。通过对锚杆(索)各基本试验组的拟合分析发现,修正极限值与拟合函数极限值之比约为0.84~0.90。关键词:锚杆(索);极限承载力;双曲线模型;指数模型;修正极限值中图分类号:TU41文献标识码:A文章编号:2096–7195(2023)01–0025–08Fittingofload-displacementcurveofanchorrod(line)andanalysisofitsultimatebearingcapacityWUJiang-bin,LUOLan,LIUWei(EastChinaArchitectureDesign&ResearchInstituteCo.,Ltd.,Shanghai200002,China)Abstract:Inspiredbytheload-displacementcurve(P-Scurve)ofengineeringcompressionpiles,theexponentialmodelandthehyperbolicmodelareusedtoanalyzetheP-Scurveoftheanchorrod(line).RelyingonthebasicP-ScurveofHonghecomprehensivetransportationhubproject,theabovetwomodelsareusedtopredicttheultimatebearingcapacityofanchorrods(lines).Itisfoundthatthepredictionresultsoftheultimatebearingcapacitybyexponentialmodelarerelativelysafe.Accordingtospecificationrequirements,thecyclictestoftheanchorrod(line)needstobecarriedout.Indataprocessingtheinitialloadcanberemovedorincludedindatafitting.Whentheexponentialmodelisused,theresultafterremovingtheinitialloadissecurer.Onthebasisofthefittingequation,thefailurestrengthisdeterminedaccordingtotheloadingconditionsandfailureconditionsstipulatedinthespecifications,andthecorrectedlimitvaluecanbeobtained.Byanalyzingthefittingequationsofeachtestgroupinthebasictest,therati...