引用格式：李征征，杨文超，张鹏，等，2023.藏东南某大型水电站工程区地应力状态及反演分析[J].地质力学学报，29（3）：442−452.DOI：10.12090/j.issn.1006-6616.20232912Citation:LIZZ，YANGWC，ZHANGP，etal.，2023.In-situstressmeasurementandinversionanalysisofalargehydropowerprojectinsoutheastTibet[J].JournalofGeomechanics，29（3）：442−452.DOI：10.12090/j.issn.1006-6616.20232912藏东南某大型水电站工程区地应力状态及反演分析李征征1，杨文超1，张鹏2，李常虎1，范玉璐2LIZhengzheng1，YANGWenchao1，ZHANGPeng2，LIChanghu1，FANYulu21.中国电建集团西北勘测设计研究院有限公司，陕西西安710065；2.中国地质科学院地质力学研究所，北京1000811.NorthwestEngineeringCorporationLimited,Xi’an710065,Shannxi,China;2.InstituteofGeomechanics,ChineseAcademyofGeologicalSciences,Beijing100081,ChinaIn-situstressmeasurementandinversionanalysisofalargehydropowerprojectinsoutheastTibetAbstract:Asacontrolandregulatingproject,thehydropowerstationintheYigongzangbubasinofTibetplaysavitalroleinmeetingtheelectricitydemandoftheTibetanpowergrid.Identifyingthishydropowerstation’spresent-dayin-situstressenvironmentandunderstandingthecharacteristicsofin-situstressdistributionatcriticallocationssuchasundergroundplantsanddiversiontunnelsareessentialtoensureitsengineeringsafety.Basedonthetectonicandgeologicalbackgroundandrockconditionsoftheprojectarea,wecarriedouthydraulicfracturingin-situstressmeasurementsbyplacingboreholesandobtainedin-situstressdatafrom4measurementpoints(8boreholes).Afiniteelementthree-dimensionalgeologicalmodelwasestablishedaccordingtotheexistinggeologicalconditions.Themeasuredstressstaterevealedtheloadingconditions,andtheinverseanalysisofthestressfieldintheengineeringareawasmade.Themaximumhorizontalprincipalstressrangesfrom4.17to16.93MPainthe2Dtestand14.2to16.23MPainthe3Dtest.ThemaximumhorizontalprincipalstressorientationisNE38°toNE47°,andtheNEdirectiondominatesthepresent-daytectonicstressfield.Inthe2995-meterelevationhorizontalplaneoftheundergroundplantareaofthepowerstation,thestressvaluesofσ1,σ...
