| 基于Hoek-Brown 准则的薄基岩厚松散层覆岩变形破坏特征研究 |
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| 作者姓名： | 李全生 徐祝贺 张勇 何文瑞 |
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| 作者单位： | 1中国矿业大学(北京)能源与矿业学院,北京100083;2煤炭开采水资源保护与利用国家重点实验室,北京100011; 3山西大同大学煤炭工程学院,山西大同037003 |
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| 摘 要： | 基于Hoek-Brown准则,以实验数据为基础确定了乌兰木伦矿的岩体力学参数,并运用 FLAC3D 研究了煤层开采引起的覆岩破坏特征。 结果表明:①在浅埋深条件下覆岩破坏直至地 表,地表形成偏态下沉盆地,最大下沉值2.1m,下沉系数0.6。 ②在开采区域四周边界一定范围 内分别形成应力降低区和应力增高区,呈现“外紧内松”状态,在工作面煤壁前方垂直应力集中 程度最高,应力集中系数为2.2,在工作面煤壁上方和开切眼上方均存在“压力拱”,但两者的跨 度、拱脚区域大小及应力集中程度不同。 ③乌兰木伦矿12403工作面垮落带高度为18.9m,导水 裂隙带高度为62.5m。
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Study on deformation and failure characteristics of overlying strata with thick loose layers and thin bedrock based on Hoek-Brown criterion |
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| Affiliation: | SchoolofEnergyandMiningEngineering,ChinaUniversityofMiningandTechnology,Beijing100083,China; 2.StateKeyLaboratoryofWaterResourceProtectionandUtilizationinCoalMining,Beijing100011,China; 3.SchoolofCoalEngineering,ShanxiDatongUniversity,DatongShanxi037003,China |
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| Abstract: | ThemechanicsparametersofrockmassinWulanmulunminearedeterminedonthebasisof theexperimentaldatameasuredinthelaboratoryandappliedHoek-Browncriterioninthispaper.On thisbasis the failure characteristics of overlying strata caused by coal mining are studied through FLAC3Dsimulationsoftware.Theresearchresultsshowthat:①Theoverlyingstrataundershallowburial depth until surface has been destroyed, and the skewness subsidence basin is formed on thesurface.Themaximumsubsidenceis2.1m,andthesubsidencerateis0.6.②Thestress-relaxedarea andthestress-increasedareaareformedinacertainrangeofthesurroundingboundaryofthemining area.Thestatepresents“externaltightinternalloosing”.Thedegreeofverticalstressconcentrationin frontofcoalwallisthehighest,andthestressconcentrationfactoris2.2.Thereisapressurearchseparatelyabovethecoalwallandtheopen-offcut,butthespan,thesizeofthearchfootandthedegree ofstressconcentrationaredifferent.③Theheightofthecavingzoneis18.9m,andtheheightofwater flowingfracturedzoneis62.5mof12403faceinWulanmuluncoalmine. |
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