基于参数反演的保扎滑坡变形破坏机理研究.pdf

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1、JournalofEngineeringGeology工程地质学报1004—9665／2011／19(6)一0795．07基于参数反演的保扎滑坡变形破坏机理研究米胡新丽唐辉明李长冬王亮清刘佑荣(中国地质大学工程学院武汉430074)摘要大型复杂滑坡的复活变形机理研究，是目前滑坡地质灾害研究热点之一。针对恩施地区典型大型复杂滑坡一保扎滑坡，在系统研究其工程地质条件的基础上，分析了该滑坡的形成机制。建立二维计算模型，利用Flac软件，依据钻孔位移监测数据，通过位移反分析反演岩土体参数。对滑坡天然状态、河流不同下切深度进行了三种工况的模拟分析，结果表明：①保

2、扎滑坡为牵引式滑坡。滑坡发育于志留系易滑岩组，滑坡形成的诱发因素是前缘老沟河的不断侵蚀下切与掏蚀，滑塌变形不断向中后部发展，从而引发整体滑动。②目前影响保扎滑坡变形与稳定性的主要因素为滑坡前缘河流下切及降雨；③保扎滑坡目前处于整体稳定状态。随着河流下切深度的增加，该滑坡将产生渐进式牵引破坏。建议对滑坡前缘进行治理。关键词保扎滑坡河流下切参数反演Flae变形破坏机理中图分类号：P642．22文献标识码：ADEFoRMATIoNMECHANISMoFBAoZHALANDSLIDEWITHPARA．METRICBACKANALYSISHUXinliTANGH

3、uimingLIChangdongWANGLiangqingLIUYourong(EngineeringFaculty，ChinaUniversityofGeosciences，Wuhan430074)AbstractThereactivemechanismoflargelandslideiscomplicatedandisakeypointoflandslideresearch．TheBaozhalandslideisatypicallargelandslideinEnshi．Itsstabilityisurgenttobeevaluatedinor

4、dertokeepsafetyforpeople．Thidpaperisbasedontheengineeringgeologicalconditioninvestigationandanalysestheformationmechanism．A2Dmodelisdeveloped．WithtileFLACsoftwareandbasedontheboreholedisplacementdata，thispaperinversestherationalcalculationparameterofthesoilsandrocksformingthelan

5、dslide．Consideringlandslidenaturalstateandrivertrenching，three-simulationsaredone．Theresultsshowthefollowingthreepoints：(1)Baozhalandslideisapullinglandslide．Itisdevelopedineasy-slidingstrata—sandstoneandmuddystoneofSilurianSystem．LaogourivererosionandrainfallarethemainJinductio

6、nfactor．Theslopefrontedgefailedatthebeginning．Thenthedeformationdevelopedtomiddleandbackoftheslope．Atlast，the‘landslidehappened．(2)atpresent，themainfactorsthatinfluencethedeformationandstabilityofthelandslidearetheLaogouherivercuttingandrainfal1．(3)theBaozhalandslideisstablenow．

7、Withtherivercuttingdeeper，thislandslideispossibletohaveaprogressivefail—ure．Thesuggestionisthatthefronttoeofthelandslideshouldbeimprovedassoonaspossible．KeywordsBaozhalandslide，Rivercutting，Parametricinversion，FLAC，Deformationandfailuremechanism收稿日期：2011—05—30；收到修改稿日期：2011—1()一2

8、8．基金项目：国家自然科学基金项目(40872175)和国家重点基础研究发展计：~lJ(973