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时间:2019-01-09
《基于三维非稳定渗流分析的隧洞开挖地下水环境影响评价》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、基于三维非稳定渗流分析的隧洞开挖地下水环境影响评价 摘要:水利工程中隧洞施工通常采用全部开挖完成再衬砌的方法。如针对开挖施工的短暂状态采用稳定渗流计算分析其对地下水环境的影响,并不符合实际,且往往会夸大地下水位降落的幅度和影响范围,因此采用非稳定渗流数值模拟技术来评价将更为合理。以某水电站发电引水隧洞施工为例,采用饱和非饱和非稳定渗流理论,建立了引水隧洞区域的三维有限元模型,对隧洞开挖过程中区域地下水非稳定渗流场进行了数值模拟,总结分析了隧洞从开始挖掘到贯通过程的地下水变化规律并进行地下水环境影响评价。结果表明:采用三维非稳定渗流分析预测隧洞开挖过程中地下水位
2、降落和降落漏斗扩大的过程是可行的;该工程引水隧洞开挖对该区域地下水影响较小,地下水补排关系总体无变化。 关键词:隧洞开挖;非稳定渗流;地下水环境;环境影响评价;三维有限元法;降落漏斗 中图分类号:TV671文献标志码:A文章编号: 16721683(2016)06013506 Effectoftunnelexcavationongroundwaterenvironmentbasedonthreedimensionalunsteadyseepageflowanalysis ZHOURenjie1,2,SHENZhenzhong1,2,XULiqun2,L
3、UJian3 (1.StateKeyLaboratoryofHydrologyWaterResourcesand11HydraulicEngineering,HohaiUniversity,Nanjing210098,China;2.TheCollegeofWaterConservancyandHydropower,HohaiUniversity,Nanjing210098,China;3.YichunWaterConservancyBureau,Yichun336000,China)) Abstract:Duringtheconstructionproce
4、ssoftunnelexcavationinahydroproject,themethodofallexcavationcompletedbeforeliningwascommonlyused.Asfortheseepageflowstabilitycalculationontunnelexcavationtemporarystatetoimpactgroundwaterenvironment,whichisnotinlinewiththeactualsituation,andoftenamplifiesthewaterlevelfluctuationandef
5、fectiverange.Inviewofthis,adoptingthetechniqueofunsteadyseepagenumericalsimulationtoassesstheimpactongroundwaterenvironmentwillbemorereasonable.Takingtheconstructionprocessofadiversiontunnelasanexample,basedonunsteadysaturatedandunsaturatedseepagetheory,thethreedimensionalfiniteeleme
6、ntnumericalmodelwasestablishedtocalculatethetransientseepagefieldoftunnelexcavationarea.Thetunnelgroundwatervariationfromcommencementtocompletionofworkswassummarized.Groundwaterenvironmentalimpactassessmentontheprocessoftunnelexcavationwasdone.Theresultsshowedthat(1)itwasfeasibletopr
7、edicttheprocessofwaterlevelfallingandaffectiverangeenlargingbythreedimensionalunsteadyseepageflowanalysis;(2)the11groundwaterinthisregionwaslesseffectedbyexcavationofdiversiontunnelandgroundwaterrechargeanddischargerelationsremainedunchanged. Keywords:tunnelexcavation;unsteadyseepag
8、eflow;ground
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