第18卷增刊2地下空间与工程学报Vol.182022年12月ChineseJournalofUndergroundSpaceandEngineeringDec.2022干湿循环作用下充填岩溶区隧道安全性研究刘韬1,刘衍顺2,邓泽城1,籍鑫雨2,张紫东2(1.江西省交通投资集团有限责任公司,南昌330025;2.山东大学岩土与结构工程研究中心,济南250061)摘要:为探究干湿循环对充填岩溶区隧道运营安全的影响,首先,开展了不同干湿循环次数岩溶充填物直剪试验,分析抗剪强度指标的劣化规律,提出了劣化系数的预测公式,并对劣化机制进行分析。研究发现:干湿循环使充填物由致密状态变为松散状态,导致抗剪强度指标劣化,黏聚力的劣化程度大于内摩擦角,干季试样的劣化程度大于湿季。然后,采用FLAC3D软件对隧道全穿和顶穿溶洞两种工况运营10年内衬砌的变形和安全系数进行计算,结果表明:全穿溶洞工况各位置变形和安全系数呈大小交替循环的趋势,干季的变形较小,安全系数较大,拱脚拱顶为软弱位置;受完好围岩的影响,顶穿溶洞工况拱顶的变形一直增大,拱脚位置干季的安全系数小于湿季,拱顶为软弱位置,应进行加固处理。关键词:运营隧道;充填岩溶;干湿循环;衬砌变形;安全系数中图分类号:U459.2文献标识码:A文章编号:1673-0836(2022)增2-0983-10StudyontheSafetyofTunnelinFillingKarstAreaunderDry-WetCycleLiuTao1,LiuYanshun2,DengZecheng1,JiXinyu2,ZhangZidong2(1.JiangxiProvincialCommunicationsInvestmentGroupCo.,Ltd.,Nanchang330025,P.R.China;2.ResearchCenterofGeotechnicalandStructuralEngineering,ShandongUniversity,Ji'nan250061,P.R.China)Abstract:Inordertoexploretheimpactofdry-wetcyclesonthesafetyoftunnelfillinginfillingkarstarea,thispaperfirstcarriedoutdirectsheartestsofkarstfillingswithdifferentnumbersofdry-wetcyclestoanalyzethedegradationlawsofshearstrengthindicator,presentedthepredictionformulaofdeteriorationcoefficient,andanalyzedthedegradationmechanisms.Thestudyfoundthatthedry-wetcyclecausesthefillingtochangefromadensestatetoaloosestate,leadingtodeteriorationoftheshearstrengthindex.Thedeteriorationofthecohesiveforceisgreaterthantheinternalfrictionangle,andthedeteriorationofthedryseasonsamplesisgreaterthanthatofthewetseason.Then,thispaperusesFLAC3Dsoftwaretocalculatethedeformationandsafetyfactoroftheliningofallandtopofthetunnellocatedinkarstcav...
