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1、第32卷增刊2岩土力学Vol.32Supp.22011年8月RockandSoilMechanicsAug.2011文章编号:1000-7598(2011)增刊2-0137-06泥质软岩地基水平抗力系数研究123范秋雁,杨钦杰,朱真(1.广西大学资源与冶金学院,南宁530004;2.广西壮族自治区地震局,南宁530004;3.广西壮族自治区地质工程勘察院,南宁530023)摘要:通过室内水平静载试验和数值模拟对泥质软岩地基水平抗力系数的比例系数m进行研究,给出m值参考值,并讨4论了影响地基岩土m值的因素
2、,研究结果表明:试验所用的南宁盆地第三系泥岩m值取值范围为17~35MN/m,桩径大时取小值,埋深大时取大值;用ANSYS模拟水平静载试验,计算出的m值与室内试验值十分接近,可为今后数值计算m值提供参考。经分析m值的影响因素后认为适当增加桩的埋深、控制岩土含水率及提高混凝土的浇灌质量等可以提高m值。关键词:泥质软岩;抗滑桩;比例系数m;室内试验;数值分析中图分类号:TU470文献标识码:AStudyoffoundationhorizontalresistancecoefficientforargilla
3、ceoussoftrocks123FANQiu-yan,YANGQin-jie,ZHUZhen(1.CollegeofResourcesandMetallurgy,GuangxiUniversity,Nanning530004,China;2.GuangxiEarthquakeAuthority,Nanning530004,China;3.GuangxiGeologicalEngineeringProspectingInstitute,Nanning530023,China)Abstract:Argil
4、laceoussoftrockisaspecialrock;thedesignofanti-slidepileinargillaceoussoftrockisdifficultbecausesomedesignparametersareunknown.Throughthelaboratoryhorizontalstaticloadtestforlargeundisturbedsamplesandthenumericalsimulationcalculation,theproportionalcoeffi
5、cientmofgroundhorizontalresistancecoefficientneededinthedesignofanti-slidepileforargillaceoussoftrockisstudied.Thispapergivesreferencevaluesoftheproportionalcoefficientm;anddiscussesthefactorsaffectingmofargillaceoussoftrock.Itisconcludedasfollows.Themva
6、luescopeofthetertiarymudstone(argillaceoussoftrock)of4NanningbasininGuangxiregion,toChinais17-35MN/m;ifpilediameterislarger,thentotakeasmallvalueofm;iftheburieddepthisgreater,thentotakealargervalueofm.Themvaluesobtainedbylaboratoryhorizontalstaticloadtes
7、tandthenumericalsimulationcalculationareveryclose,soastoprovidereferenceformvaluecalculationinfuture.Thefactorsaffectingm,suchaspilediameter,depth,concretepouring“concreteirrigationquality,rockandsoilwatercontents,lateraldisplacement,theamountoftheloadan
8、dlong-termload,areanalyzed.Keywords:argillaceoussoftrock;anti-slidepile;proportionalcoefficientm;laboratorytest;numericalanalysis其中的一个重要原因是抗滑桩设计中桩侧岩土水平1引言抗力系数的比例系数m值取值不合理,国内相关的泥质软岩在我国分布广泛,如广西南宁盆地的规范中也没有给出这类岩石的m值,也未见对这一第三系泥