腊寨水电站坝址右岸边坡三维数值模拟分析.pdf

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1、JournalofEngineeringGeology工程地质学报1004—9665／2013／21(4)一0641—08腊寨水电站坝址右岸边坡三维数值模拟分析水王定伟①②伍法权①马艾阳①(①中国科学院地质与地球物理研究所工程地质力学重点实验室北京100029)(②中冶集团武汉勘察研究院有限公司武汉430080)摘要边坡变形破坏是水利水电工程中多发的地质灾害之一，通过三维数值模拟开展边坡稳定性评价对防灾减灾及滑坡预报具有重要的意义和价值。本文对云南腊寨水电站坝址右岸边坡进行了数值计算。经过调查边坡工程

2、地质条件，本文试图通过分析边坡岩体结构类型、结构面与坡面的产状关系以及诱导因素研究边坡变形成因机制，在此基础上，利用FLAC如三维数值模拟分析方法，分别计算了原始边坡、开挖未支护和支护后的边坡应力场、位移场和塑性区分布，结合工程地质条件分析，对其变形机制进行了深入探讨。研究结果表明，边坡处于压致拉裂的初始阶段，边坡变形受开挖作用影响明显。根据边坡变形研究结果提出相应的支护方法，包括预应力锚索、网格梁和挂网喷锚等方法，使边坡变形得到有效控制。关键词边坡数值模拟塑性区压致拉裂加固中图分类号：P642．22

3、文献标识码：ATHREEDIMENSIoNALNUMERICALSIMULATIoNFoRRIGHTBANKSLoPEoFLAZHAIHYDRoPoWERSTATIoNWANGDingwei~WUFaquan①MAAiyang①(①嘶LaboratoryofEngineeringGeo—mechanics，InstituteofGeologyandGeophysicsChineseAcademyofSciences，Beijing100029)(②WuhanSurveying—Geoteehnical

4、ResearchInstituteCo．，Ltd．ofMCC，Wuhan430080)AbstractSlopefailureisoneofthegeologicaldisastersfrequentlyoccurringinwaterresourcesandhydropowerengineering．Theevaluationonslopestabilitywiththreedimensionalnumericalsimulationisofgreatsignificanceandvaluefort

5、hedisasterpreventionandmitigationandlandslideforecast．Thispapermainlystudiestheslopesta—bilityattherightbankofLazhaihydropowerstation．ThestationislocatedinYunnanProvince，China．Thepaperpresentsasystematicinvestigationofthesiteengineeringgeologicalconditi

6、onsthetypeofrockmassstructure，andthemechanismofdeformation．Itexaminestheoccurrencerelationsbetweenstructuralplaneandslopeandthepo—tentialinductionfactorofthefailureoftheslopeindetail．Meanwhile，thestressfiled，thedisplacementfieldandthedistributionofthepl

7、asticzonesoftheoriginalslope，thenon-supportingandsupportingslopesafterexcavationarerespectivelyobtainedwithtrue—three—dimensionalnumericalsimulation(FLAC。)．Themechanismofthede—formationisanalyzed，combiningtheanalysisoftheengineeringgeologiccondition．The

8、resultsshowntheslopeisintheinitialstageoftensionanditsdeformationisaffectedbytheexcavationobviously．Accordingtotheresearchresultsoftheslopedeformationmechanism，somecorrespondingreinforcementmeasuresaretakentocontrolthede一}收稿日期：20