摘要:
弯曲倾倒破坏作为一种复杂的滑坡灾害,对其破坏机理的研究是近年来学术界关注的重 点和难点。 本文采用非连续变形分析法(DDA)模拟露天矿边坡弯曲倾倒破坏过程。 在DDA模 型中通过引进人工结构面方法来实现弯曲倾倒过程岩体开裂,与现场比较得到了合理的引入人 工结构面方法。 模拟过程表明,该露天矿边坡是由于下部岩层无法承受上部荷载首先发生破坏, 致使上部岩体失去支撑,并最终导致边坡整体倾倒破坏。 针对抵抗边坡弯曲倾倒变形的支护分 析表明,由于倾倒变形的不均匀性,依靠普通锚索强度进行支护,容易出现局部锚索拉断,最终影 响整个锚固区的锚索安全。
Abstract:
Flexuraltopplingfailureisacomplexprocessoflandslidedisaster,onwhichtheresearches graduallybecomethekeyanddifficultpointsintheacademicfield.Takinganopen-pitmineslopefailureduetoflexuraltopplingasanexample,thisstudyattemptstointroducediscontinuousdeformationanalysismethod(DDA) tosimulatethecomplexfailureprocess.Firstly,thewaytointroduceartificial jointsintoDDAmodeltosimulatefracturingthroughtheintactrockmassesduringtheflexuraltoppling processisanalyzed.Bycomparingwiththefailurephenomenaoffieldcase,theproperwaytointroduce artificialjointsisobtained,andtheresultsconfirmDDAisapropermethodtoanalyzeflexuraltoppling failureofnumericalmethod.Thesimulationprocessshowsthatthelowerpartslopefailsfirstlybecause itisunabletosupporttheupperrocklayers,andthentheupperpartslopefailsduetothelossofthe supportfromthelowerpartslope.Theresearchonthereinforcementschemeagainstflexuraltoppling deformationoftheslopeindicatesthatifthereinforcementsdependonthestrengthoftheordinaryanchorcable,localfailureoftheanchorcablesbecomesveryeasy,whichcouldinducethefailureofthe
wholeanchorcablesfinally.
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