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ID:52404335
大小:2.09 MB
页数:6页
时间:2020-03-27
《利用地源热泵防止季节性冻土路基冻解破损的数值分析.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、第31卷第6期2014年6月公路交通科技JournalofHighwayandTransportationResearchandDevelopmentVoL31No.6Jun.2014doi:10.3969/j.issn.1002—0268.2014.06.002利用地源热泵防止季节性冻土路基冻解破损的数值分析苏延桂1,王旭2(1.青海大学土木工程学院,青海西宁810016;2.兰州交通大学,甘肃兰州730010)摘要:为解决季节性冻土区路基结构因冻解破损而发生的各种病害,利用地源热泵系统改变路基结构温度场。以109国道青海省季节性冻土区路基为研究实例,运用ANSYS模拟分析1
2、09国道季节性冻土区原始温度场,并分析了地源热泵路基的工作原理及运行效果;介绍了地源热泵系统形式及设计计算中的有关问题,得出地源热泵路基系统的设计参数;利用ANSYS有限元法对地源热泵路基的水平埋管进行模拟分析,通过对比分析得出路堤中水平埋管宜分2层布置(一1m处埋置4根,每管间距为2m;一3.5m处埋置5根,每管间距为4m)。在上述设计方案下,该地区在全年最冷时刻路基易发生冻胀区域的地温超过0℃。通过模拟分析得出,地源热泵路基是一种新型路基结构,该系统对于防治季节性冻土路基冻胀病害具有积极作用。关键词:道路工程;地源热泵路基;ANSYS模拟;季节性;冻土中图分类号:U416.
3、1文献标识码:A文章编号:1002—0268(2014)06—0011—06NumericAnalysisforPreventingFreeze-thawDamageofSeasonalFrozenSoilSubgradeUsingGroundSourceHeatPumpSUYan—guil,WANGXu2(1.SchoolofCivilEngineering,QinghaiUniversity,XiningQinghai810016,China;2.SchoolofCivilEngineering,LanzhouJiaotongUniversity,LanzhouGansu7
4、30010,China)Abstract:Inordertosolvevariousdiseasesofsubgradestructureinseasonalfrozensoilareaduetofreeze-thawdamage,wechangedthetemperaturefieldofsubgradestructurebyusingthegroundsourceheatpumpsystem.BasedontheseasonalfrozensoilregionalongnationalhighwayNo.109inQinghaiProvince,wesimulatedthe
5、originaltemperaturefieldofthehighwaybyANSYSsimulationandanalyzedtheworkingprincipleandoperationeffectofgroundsourceheatpumpsubgrade.Weintroducedsomeproblemsofformssystemformofgroundsourceheatpumpanditsdesigncalculation,andobtainedthedesignparametersofthegroundsourceheatpumpsubgrade.UsingANSY
6、Sfiniteelementmethods,wesimulatedthearrangementofhorizontalburiedtubes,throughthecontrastanalysis,weobtainedtheschemethattoputthehorizontalpipestructureby2layers,arrange4pipesat一1mpositionwithpipespacingof2m,andarrange5pipesat一3.5mpositionwithpipespacingof4m.Underthisdesignscheme,thegroundte
7、mperatureofthesubgradeareawhereispronetofrostheavingismorethan0℃inthecoldestmomentthroughouttheyear.Throughthesimulationanalysis,wefoundthatgroundsourceheatpumpsubgradeisanewstructureforsubgrade,whichispositiveforpreventionandtreatmentoffreeze-thaw
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