杨家村矿弱胶结软岩大断面煤巷变形特征研究.pdf

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1、第25卷第9期中国矿业Vo1．25，No．92016年9月CHINAMININGMAGAZINESep．2016采选技术杨家村矿弱胶结软岩大断面煤巷变形特征研究李清，侯健，曹怀建，杨鸣泽(1．中国矿业大学(北京)力学与建筑工程学院，北京100083；2．霍州煤电集团河津腾晖煤业有限责任公司，山西河津031400)摘要：黏土为分析杨家村矿弱胶结软岩大断面煤巷变形特征，采用现场调研、室内实验、现场实测手段对围岩物理力学性质与围岩位移曲线演化过程进行较深入探究，结果表明：岩石软化系数约为0．23，属于软化岩石；围岩具有易吸水、膨胀、强度低、胶结性差

2、，且易发生塑性变形的物理力学特征；顶板围岩变形整体大于底板与帮部；不同区段顶板围岩位移程度具有差异性；顶板深基点岩层位移大于浅基点岩层位移；岩层位移曲线总体上初期变化速率较快，后期呈“台阶”式演化特征，各基点曲线演化过程在时空上近似同步；缩小巷道宽度，改变支护锚固方式，提高支护强度，适度泄水与排水并及时喷浆封闭围岩，有助于维护该类巷道围岩稳定。关键词：弱胶结软岩；大断面煤巷；软化系数；岩层位移中图分类号：TD263文献标识码：A文章编号：10044051(2016)0908205Researchintothedeformationcharac

3、teristicsofcoalroadwaywithweaklycementedrockstrataandlargesectioninYangjiacunmineLIQing，HOUJian，CAOHuai—jian，YANGMing—ze(1．SchoolofMechanicsandCivilEngineering，ChinaUniversityofMiningandTechnology(Beijing)，Beijing100083，China；2．TengHuiCoalIndustryCo．，Ltd．，HuozhouCoal8LElect

4、ricityGroup，Hejin031400，China)Abstract：InordertoanalyzedeformationcharacteristicsofcoalroadwaywithweaklycementedrockstrataandlargesectioninYangjiacunmine，instiuationinvestigation，laboratoryexperiments，andinstitutionmonitoringwereadoptedtoresearchthephysical—mechanicalcharac

5、teristicsofsurroundingrockandevolutionarytraitsofdisplacementcurves．Theresultsshowthatthesofteningcoefficientisapproximateto0．23，andtherockisbelongtosofteningrock；thephysical-mechanicalcharacteristicsofsurroundingrockincludewaterabsorption，dilation，lowstrength，inferioragglu

6、tination，andisapttoplasticdeformation；thedeformationinroofisthehighest；thedeformationofroofhasdifferencesatdifferentparts；thedisplacementatdeepbasepointissuperiortoshallowpoint；thevelocityofdisplacementcurveisfasteratthebeginningphaseandthecharacteristicofcurveshowsstepinth

7、enextperiod；theevolutionaryprocessofcurvekeepthesamepaceinthetimeandspaceamongthebasepoint；shrinkingwidthofroadway，changingthestyleofanchorage，enhancingsupportstrength，drainingawaywaterandgunitingandsealingsurroundingrockintimewhicharehelpfultokeepsurroundingrockstability．K

8、eywords：weaklycementedrockstrata；largesectionroadway；softeningcoefficient；rockstra