摘要:
为探究极近距离煤层回采巷道围岩稳定性类别与支护方式,用数学方法综合评价围岩稳 定性类别。 采用模糊综合评判法建立数学模型,选择围岩自身性质和应力环境等影响因素作为 围岩分类指标,求解模糊综合判别矩阵、指标权重和围岩隶属程度;运用灰色关联度分析法对围 岩稳定性类别进行验证,并提出相应的巷道支护方式。 结果表明,极近距离煤层回采巷道对Ⅰ— Ⅴ类围岩的隶属度分别为0.1846、0.2117、0.1866、0.1776、0.2394,其中Ⅴ类围岩隶属程度最 大,与验证结果相一致。 围岩属于Ⅴ类极不稳定围岩,极近距离开采导致顶板破碎,巷道承受荷 载较小,采用U形钢梁棚支护,矿压观测显示巷道支护效果显著。
Abstract:
Inordertoexplorethestabilitycategoryandsupportmodeofsurroundingrockof mining roadwayinextremelyclosecoalseams,thestabilitycategoryofsurroundingrockisdeterminedbycomprehensiveevaluationwithmathematicalmethod.Firstly,themathematicalmodelisestablishedbyusing themethodoffuzzycomprehensiveevaluation,andfactorssuchasthenatureofsurroundingrockand stress environment are selected as the classification index of surrounding rock.Then, fuzzy comprehensive discriminant matrix,index weight and membership degree of surrounding rock are solved.Then,theclassificationofsurroundingrockstabilityisverifiedbythemethodofgreycorrelation degreeanalysis.Finally,thecorrespondingroadwaysupportmodeisputforward.Theresultsshowthat degreesofmembershipofminingroadwayinextremelyclosecoalseamstoⅠ-Ⅴtypesurrounding rocksare0.1846,0.2117,0.1866,0.1776and0.2394,respectively.Thedegreeofmembershipof Vtypesurroundingrockisthelargest,whichisconsistentwiththeverificationresults.Surroundingrock belongstoVtypeextremelyunstablesurroundingrock.Inaddition,theroofisbrokenandroadwaypressureissmallduetoextremelyclosemining.ThenU-shapedsteelbeamshedsupportisproposed.The observationofrockpressureshowsthattheeffectofroadwaysupportisremarkable.
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