西南大渡河某水电站溢洪道陡槽段雾化边坡稳定性分析.pdf

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1、JournalofEngineeringGeology工程地质学报1004—9665／2010／18(3)．0425—06西南大渡河某水电站溢洪道陡槽段雾化边坡稳定性分析巨能攀赵建军黄润秋肖华波吕辉(成都理工大学地质灾害防治与环境保护国家重点实验室成都610059)摘要泄洪雨雾入渗导致边坡变形进而影响边坡稳定性的问题已成水电建设的重要工程问题之一。针对西南某水电站溢洪道陡槽段边坡挤压错动带发育、节理裂隙和控制性结构面发育等结构特点，分析该边坡开挖支护后泄洪雾化条件下潜在失稳的边界条件及变形破坏模式。根据边坡所处的地质环境条件，从泄洪雾化对边坡岩体的作用机制人手，得

2、到了雨雾对该边坡稳定性的影响主要为雨雾沿着顺倾坡外拉裂面入渗，影响结构面力学特性，从而影响边坡稳定性。并按结构面类型取不同软化系数，采用数值模拟方法分析了泄洪雨雾人渗后边坡的变形破坏趋势。分析结果表明：在考虑不同的软化系数时，溢0+555．00下游侧边坡岩体稳定性有较大的差别，若以中间值0．75考虑，溢洪道陡槽段边坡的稳定性稍差，可能产生一定规模的剪切蠕动变形或块体失稳，必须加强一定的支护措施保证该处边坡在施工期安全和运营期间的长期稳定性。关键词泄洪雾化滑移压致拉裂软化系数剪切蠕动稳定性中图分类号：TD824．71文献标识码：ASTABILITYANALYSISO

3、FATOMIZEDSLoPEBES】[I)ESPILLWAYATHYDRoPoWERSTATIoNoFDADURⅣER．SoUTHWESTCHINAJUNengpanZHAOJianjanHUANGRunqiuXIAOHuaboLVHui(StateKeyLaboratoryofGeoHazardPreventionandGeoEnvironmentProtection，ChengduUniversityofTechnology，Chengdu610059)AbstractSpillwayslopedeformationcanbecausedbyinfiltrat

4、ionofrainandfog．Itturnstoafectthestabilityoftheslope．Ithasbecomeoneoftheimportantproblemsoftheconstructionofhydropowerstations．Thispaperisbasedonthestructuralfeaturesofslopeslippagebelt，cracksandcontroljointsstructuredevelopinginatomizedslopeinthechutesegmentofthespillwayinonesouth—we

5、sthydropowerstation．Itanalysistheboundaryconditionsanddeformationandfailuremodesofpotentialinstabilityintheconditionofflooddischargeatomizationaftertheex—cavationandsupportingoftheslope．Itexaminesthegeologicalenvironmentconditionsoftheslope．Itusesthemechanismoftheflooddischargeatomiza

6、tionroleontherockslope．Itfindsthatthemajorimpactofrainandfogtoslopeisinfiltrationofrainandfogalongthetensioncracksurfacesoftheslope．Theinfiltrationinfluencestheme—chanicalpropertiesofthestructuralplane，thusaffectsthestabilityoftheslope．Theanalysisofthedeformationcharacteristicsiscarri

7、edoutonstructuralplaneofthediferentsofteningcoeficientintheslope。Thetrendoftheslopedeformationandfailureaftertheinfiltrationofflooddischargeatomizingrainandfogisfurtheranalyzedusingnumericalsimulation．Theresultsshowthatdiferentsofteningcoefficientscanresultinalargerdiferenceamong{收稿日期

8、：2009