资源描述：
《薄基岩综放采场直接顶结构力学模型分析》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、第38卷第8期煤炭学报Vol.38No.82013年8月JOURNALOFCHINACOALSOCIETYAug.2013文章编号:0253-9993(2013)08-1331-07薄基岩综放采场直接顶结构力学模型分析1,22杜锋,白海波(1.河南理工大学能源科学与工程学院,河南焦作454000;2.中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116)摘要:为深入研究薄基岩综放采场矿压显现规律,以山西潞安矿业集团司马煤矿薄基岩区厚煤层开采为研究背景,采用数值模拟、理论分析、现场实测等方法对薄基岩综放采场直接顶结构特征进行了研究,建立
2、了薄基岩综放采场直接顶结构力学模型,分析了直接顶“半拱”式平衡结构的形成机理和破断规律。结果表明:根据司马矿薄基岩区直接顶厚度和岩层性质不同,将直接顶划分为Ⅰ型和Ⅱ型两种类型;采高6.5m,直接顶厚度大于15m时,容易形成“半拱”式平衡结构,采场矿压呈现出来压步距短、静压大、动压小、动载系数小等特征,“半拱”结构有规律的破断失稳是薄基岩综放工作面矿压显现的根源,该结论解释了司马煤矿薄基岩综放采场的矿压显现规律。关键词:薄基岩;综放开采;直接顶;半拱结构;厚松散层中图分类号:TD823．49文献标志码:AMechanicalanalysisofimmed
3、iateroofinfullymechanizedtopcoalcavingminingwiththinbedrock1,22DUFeng,BAIHai-bo(1.SchoolofEnergyScienceandEngineering,HenanPolytechnicUniversity,Jiaozuo454000,China;2.StateKeyLaboratoryforGeomechannicsandDeepUn-dergroundEngineering,ChinaUniversityofMiningandTechnology,Xuzhou2211
4、16,China)Abstract:Inordertofurtherinvestigatetheminepressurebehaviorofthin-bedrockinfully-mechanizedsublevelca-vingface,thispapertookthethickcoalseamminingunderthinbedrockroofinSimaCoalMineofLu’anGroupasacaseinpoint.Thestructuralcharacteristicsofimmediateroofinlongwalltopcoalcav
5、ingfacewiththinbedrockroofwerestudiedbyusingofnumericalsimulation,theoreticalanalysis,in-sitemeasurement,etc.Mechanicalmodelofim-mediateroofinlongwalltopcoalcavingfacewiththinbedrockroofwasestablished,andtheformationmechanismandbreakagelawofsemi-archstructuralmodelofimmediateroo
6、fwerealsoanalyzed.Theresultsindicatethattheimmedi-ateroofisdividedintotwotypesastypeⅠandtypeⅡbasedonthethicknessandrockpropertiesofimmediateroofinSimaMinethinbedrockarea;semi-archstructuralmodelofimmediateroofiseasilyformed,whenminingheightis6.5mandthethicknessofimmediateroofism
7、orethan15m;thephenomenonofshortweightinginterval,bigstaticpressure,littledynamicalpressure,littlecoefficientofliveloadispresentedinminingpressurebehavior;theregularbreakingofsemi-archstructureistherootofminingproperlyexplainsthelawofminingpressurebehaviorofthinbed-rockroofpressu
8、rebehaviorsofthinbedrockroofinlongwalltopcoalca
