缓倾煤层采空区上覆山体滑坡形成机制分析.pdf

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1、JournalofEngineeringGeology工程地质学报1004-9665／2013／21(1)-0061—08缓倾煤层采空区上覆山体滑坡形成机制分析：l：王玉川①巨能攀①赵建军①向喜琼②(①成都理工大学地质灾害防治与地质环境保护国家重点实验室成都610059)(②贵州大学贵州省喀斯特环境与地质灾害防治重点实验室贵阳550003)摘要下伏采空区的缓倾斜坡，由于采空区大小、方位不同和斜坡结构特征的差异，多存在地表沉陷、拉裂、局部崩塌、滑坡等工程地质问题，常常会诱发大规模的地质灾害。马达岭滑坡发育于存在软弱夹层和

2、煤层采空区的缓倾斜坡中，由采空区的破坏和降雨诱发形成，体积达190~1011。调查和分析表明，脆弱的地质结构和坡体下伏采空区的破坏是滑坡形成的主要原因，降雨的促进作用加速了滑坡的发生；马达岭滑坡的破坏模式为“塌落一拉裂一剪切滑移”，滑坡的形成机制和发展过程可以分为以下3个阶段：斜坡后缘拉裂阶段，滑面贯通阶段和滑坡整体破坏阶段。崩滑体崩解后顺着沟谷向下游流动，形成长1．5km的泥石流碎屑堆积区，淹没大量农田。关键词滑坡采空区变形破坏机制midas／GTS中图分类号：TU413文献标识码：AFoRMATIoNMECHANI

3、SMoFLANDSLIDEABoVETHEMINEDoUTAREAINGENTLYINCLINEDCoALBEDSWANGYuchuan①juNengpan①ZHAOJianjun①XIANGXiqiong②((~SateKeyLaboratoryofGeohazard)reonandGeoenvironmentProtection，ChengduUniversityofTechnology，Chengdu610059)(@KeyLaboratoryofKantEnvironmentandGeohazardPreven

4、tion，Min~tryofEducation，Gu~houUniversity，Guiyang550003)AbstractMining—outareainslopewithgentlyinclinedcoalbedsalwayscaninducesomeengineeringgeologicalproblemsincludingsubsidenceandcrackingofthesurface，partialcollapse，landslide．Theyareduetothediffer—enceofthegoaf

5、sizeandtheslopestructurecharacteristics．Theycancauselarge—scalegeologicaldisasters．TheMadalinglandslidewasgeneratedintheslopewithgentlyinclinedstratadippinginwardwithsoftrocksandwichandcoalmining—outarea．Thelandslidewascausedbythemining—outareaandthestorm．Itsvol

6、umeisupto190×10m．Accordingtotheengineeringgeologicalsurveyandanalysis．theweakgeologicstructureandthedamageofthegoafundertheslopemainlycausedthelandslide．Theconcentratedregionalrainfallacceleratedtheoccurrenceofthelandslide．TheformationmechanismoftheMadalinglands

7、lideisthetypeof“collapse—rip-shearslip”．Themechanismandprocessofthelandslidecanbedividedintothreestagesasfollows：(1)tensioncrackingoftrailingedgeoftheslope，(2)slidingsurfacedevelopingandinterconnect，and(3)integralfailureofthelandslide．Theslidingmassfloweddownstr

8、eamafterdisintegration，andformed1．5kmlongdebrisflowaccumulationarea．Largeareafarmlandwassubmergedbythedebris．KeywordsLandslide，Mined．outarea，Deformation，Failuremechan