宝鸡-常兴段滑坡分布规律与发育背景.pdf

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1、JournalofEngineeringGeology工程地质学报1004—9665／2014／22(3)．0379—07DOI：10．13544／j．cnki．jeg．2014．03．005宝鸡一常兴段滑坡分布规律与发育背景术王佳运①②石小亚①冯卫①②(①中国地质调查局西安地质调查中心西安710054)(②国土资源部黄土地质灾害重点实验室西安710054)摘要在前人工作的基础上，借助实地调查、勘查等手段，分析研究了陕西省宝鸡一常兴段黄土塬边滑坡分布规律与发育背景。通过分析、研究认为：(1)宝鸡一常兴段黄土塬边自西向东滑坡规模由特大型向大型、中型甚至小型渐变；(2

2、)三级阶地缺失或三级、二级阶地同时缺失地段均有滑坡发育；(3)宝鸡一常兴段黄土塬边滑坡集中发育在3个时期：晚更新世初期、全新世初期与全新世漫滩期；(4)渭河盆地西部地壳差异性向东掀斜运动形成了不同高差级别台塬的地貌格局，决定了滑坡发育规模的规律性变化；渭河北迁与侵蚀加剧造成了宝鸡一常兴段黄土塬边滑坡不同时期的集中出现；(5)人类工程活动的加剧是漫滩侵蚀期新滑坡或古老滑坡复活的主要诱发因素。关键词黄土塬边滑坡分布规律发育背景掀斜运动渭河北迁中图分类号：P642．22文献标识码：ADISTRIBUTIoNREGULARITYANDDEVELoPMENTBACKGRoU

3、NDoFLANDSLIDESATEDGEoFLoESSTABLELANDFRoMBAoJIToCHANGXINGWANGJiayun03~SHIXiaoya~FENGWei①②(①anCenterofGeologicalSurvey，ChinaGeologicalSurvey，Xian710054)(~KeyLaboratoryfo，Geo-hazardsinLoessArea，MLR，Xian710054)AbstractThispaperisbasedonthepredecessorsresearchandisaidedwithinvestigationand

4、prospectionatfield．ItanalyzesthedistributionregularityanddevelopmentbackgroundoflandslidesattheedgeoftheloesstablelandsfromBalitoChangxing．Itprovesthefollowingfivepoints．(1)ThescalesofthelandslidesdecreasegraduMlyfromsuperlargetolargeandmiddle，evensmal1．(2)Landslidesareatthesesiteswhe

5、rellIterraceorboth11IandIIterracedisappeared．(3)Developmentoflandslidesmainlyhasthreeperiods：earlystageoflatePleistoceneepoch，earlystageofHoloceneepochandlaststageofHoloceneepoch．(4)TheeastwardtiltingmovementwithactivitydifferenceofthelithosphereinthewestofWeiheriverbasinresultedinthe

6、physiognomypatternoftablelandswithdistinctaltitudedifferences．Thenitcontrolledthedevelopmentregularchangeofscalesofthelandslides．ThenorthwardmovementofWeiheriverandintenseriversideerodinginducedtheconcentrateddevelopmentoflandslidesattheedgeofthetablelandsindifferentperiods．(5)Theinte

7、nsehumanengineeringmovementsarethemaininducingfactorofnewlandslidesorrevivalofoldlandslidesinlatestageofHolocene．KeywordsLandslideattheedgeofloesstableland，Distributionregular，Developmentbackground，Tiltingmovement，NorthwardmovementofWeihefiver}收稿日期：2013-08-07；收到修改稿日期：2014—01-02．基金项目：国

8、土资源大调