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时间:2020-03-25
《无粘结环锚预应力衬砌锚具槽布置方式对比研究.pdf》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、水利水电技术第48卷2017年第7期无粘结环锚预应力衬砌锚具槽布置方式对比研究曹瑞琅1,王玉杰1,皮进2,郑理峰1,刘立鹏1(1.中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京100038;2.北京航空航天大学交通科学与工程学院,北京100091)摘要:无粘结环锚预应力衬砌锚具槽是整个预应力衬砌受力的关键部位,其位置的选择对于整个预应力衬砌受力和安全而言至关重要。结合引松供水工程有压输水隧洞无粘结预应力衬砌结构,采用等效荷载法和实体建模相结合的方法进行Flac3D三维建模,对锚具槽单排和双排布置时的
2、衬砌关键部位受力情况进行了分析。计算结果表明:(1)无粘结环锚预应力衬砌的下半环因锚具槽的影响,会存在局部预应力缺失和分布不均,而单排锚具槽布置能减小衬砌预应力的不均匀性。(2)锚具槽及附近区域是预应力衬砌的薄弱区,衬砌拉应力区主要分布在锚具槽环向的临空面附近,衬砌受压最大区域分布在相邻锚具槽之间。(3)双排锚具槽布置型式抗超载能力优于单排锚具槽布置型式。关键词:预应力衬砌;无粘结环锚;锚具槽;有压隧洞;数值计算doi:10.13928/j.enki.wrRhe.2017.07.010中图分类号:TV672文献标识
3、码:B文章编号:1000-0860(2017)07-0059—05Comparativestudyonlayoutpatternsofanchorageslotsforpre-stressedliningwithunbondedcircularanchoredtendonsCAORuilan91,WANGYujiel,PIJin2,ZHENGLifen91,LIULipen91(1.ChinaStatekeyLaboratoryofSimulationandRegulationofWaterCycleinRiver
4、Basin,ChinaInstituteofWaterResourcesandHydropowerResearch,Beijing100038,China;2.BeihangUniversity,SchoolofTransportationScienceandEngineering,Beijing100091,China)Abstract:Theslotsofpre-stressedlininganchoragewithunbondedcircularanchoredtendonsarethekeyforcedpa
5、rtsforentirepre-stressedlining,andthentheselectionoftheirlocationsisquiteimportantfortheforcedstatusandsafetyofentirepre-stressedlining.Combinedwiththeunboundedpre-stressedliningstructureofthepressurewaterconveyancetunnelforSonghuajiangRiverDiversionWaterSuppl
6、yProject,theforcedstatusesofthekeypartsoftheliningwithsingle—rowlayoutanddouble-rowlayoutofanchorageslotsareanalyzedwithFlac3Dmodelingcarriedoutbycombiningequivalentloadmethodwithsolidmodelingmethod.Thecaleulationresuhshowsthat:(1)theabsenceandununiformdistrib
7、utionoftheloealpre-stressarethereatthelowerhalf-ringoftheprc-stressedliningwithunbondedcircularanchoredtendonsduetotheinfluencefromanchorageslot,whereas,thean-uniformityoftheliningpro-stressCanbereducedbythesingle—rOWlayoutoftheanchorageslots;(2)boththeanchora
8、geslotsandtheareasnearthemaretheweaklocationsforthepre—stressedliningandtheliningtensilestressareasaremainlydistributednearthecircularfreefaceoftheanchorageslot,whilethemaximumforc
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