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1、第42卷第2期中南大学学报(自然科学版)Vol.42No.22011年2月JournalofCentralSouthUniversity(ScienceandTechnology)Feb.2011预应力锚索荷载传递与锚固效应计算1,2332邓宗伟,冷伍明,邹金锋,唐葭(1.中南大学资源与安全工程学院湖南长沙,410083;2.湖南城市学院土木工程学院,湖南益阳,413000;3.中南大学土木建筑学院湖南长沙,410075)摘要:考虑岩体的损伤特性,根据剪切位移法,推导锚固段侧摩阻力沿锚固长度的非线性分布计算公式;结合该公式和Mindlin解,推导出锚固岩体影响范
2、围内任一点的应力分布解析解,并以具体例子进行计算分析。研究结果表明:锚索在锚固段的应力分布主要集中在前端1/3处,比传统方法计算的结果更集中;为提高锚固的效果不能一味增加锚固段长度,而应增加有效的锚固面积或分散前端的集中应力;锚索的设计参数中,相邻锚索之间相互影响的最小距离应以正应力为标准进行控制,而锚固力则应以剪应力为标准进行控制;随着锚索拉力的增加,在锚固段应力影响范围增加较小,但应力集中程度增加较大,因此,锚索设计时不但要考虑锚索与锚固体的黏结强度,更要考虑锚固体与岩土体的黏结强度。关键词:预应力锚索;非线性分布;Mindlin解;荷载传递;锚固效应中图分
3、类号:TU398文献标志码:A文章编号:1672−7207(2011)02−0501−07Calculationofpre-stresscabletransferenceofloadandeffectofanchor1,2332DENGZong-wei,LENGWu-ming,ZOUJin-feng,TANGJia(1.SchoolofResourcesandSafetyEngineering,CentralSouthUniversity,Changsha410083,China;2.SchoolofCivilandEngineering,HunanCityUn
4、iversity,Yiyang413000,China;3.SchoolofCivilEngineeringandArchitecture,CentralSouthUniversity,Changsha410075,China)Abstract:Basedonsheardisplacementmethod,consideringthedamagecharacteristicofrockmass,thenonlineardistributioncalculationformulaoflateralfrictionalongtheanchoragelengthwas
5、deduced.CombiningthisformulawithMindlinsolution,theanalyticsolutionofstressdistributioninanchoringrockmasswasdeduced.Takingadvantageofthisanalyticalsolution,thespecificexampleswerecalculatedandanalyzed.Theresultsshowthattheanchorsection'sstressdistributionmainlyconcentratesinthefront
6、end1/3ofcable,anditismorecentralizedthantheclassicalapproach.Insteadofincreasingthelengthofanchoringcable,increasingtheanchoringareaordispersingthefrontendcentralizedstresscanenhancetheanchoringeffect.Inanchorcable’sdesignvariable,theneighboringanchorcablemutualinfluence’sminimumrang
7、eshouldtakethenormalstressasastandardtocontrol,buttheanchorageforceshouldtaketheshearingstressasastandardtocontrol.Withtheincreaseofcabletensileforce,intheanchorsection,therangeofinfluenceofstressincreaseslessthanstressconcentrationdegree.Therefore,theinterface’sbondstrengthbetweenan
8、choringmassa