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时间:2020-03-26
《金属矿山开采过程上覆岩层应力与变形特征.pdf》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34卷第4期矿冶工程Vo1.34Nv42014年08月MIN1NGANDMETALLURGICALENGINEERINGAugust2014金属矿山开采过程上覆岩层应力与变形特征①赵康,赵奎(1.江西理工大学建筑与测绘工程学院,江西赣州341000;2.江西理工大学工程研究院,江西赣州341000)摘要:采用数值分析方法,研究了动态开采过程中金属矿山采空区覆岩在拉应力、垂直应力作用下的位移及变形破坏特征。研究发现拉应力对覆岩造成的破坏较其它应力显著,是覆岩垮落的主导因素。分析覆岩内部垂直应力发现:开采初期覆岩内部压应力显著
2、,随着开采进行,在采空区的正上方,压应力逐渐向拉应力过渡;垂直应力呈“凹”形分布在采空区两端部,其形状和应力值随采空区的增大而增大。随着工作面的推进,覆岩下沉范围和下沉量均逐渐增大;下沉曲线的最大下沉点,向工作面推进方向逐渐移动;下沉曲线的光滑程度体现了监测点在覆岩所属区域是弹性区、塑性区还是垮落区。研究结果可为矿山围岩支护提供一定参考依据。关键词:开采过程;上覆岩层;变形特征;拉应力;垂直应力;位移中图分类号:TD324文献标识码:Adoi:10.3969/j.issn.0253—6099.2014.04.002文章编号:
3、0253—6099(2014)04—0006—05StressandDeformati0nCharacteristicsofOverburdeninMiningofMetalMineZHAOKang,ZHAOKui(1.SchoolofArchitecturalandSurveying&MappingEngineering,JiangxiUniversityofScienceandTechnology.Ganzhou341000,Jiangxi,China;2.EngineeringResearchInstitute,Jia
4、ngxiUniversityofScienceandTechnology,Ganzhou341000,Jiangxi,China)Abstract:Displacementanddeformationcharacteristicsofoverburdenovergobundertheforceoftensionandverticalstressduringactiveminingofmetalminewasstudiedbyusingnumericalsimulationmethod.Itwasfoundthattheten
5、sionisthedominantfactorfortheoverburdencollapse,bringingmorenotabledamagetoitthanotherstresses.Theanalysisofverticalstressinsidetheoverburdenshowedthattheinternalcompressivestresswasremarkableattheearlystageofexplorationandthecompressivestressofoverburdenrightoverg
6、obareawouldbegraduallytransformingintotensionasexplorationgoingfurther,whiletheverticalstressdistributedatbothsidesofthegobarea,justlikeaconcavecurve,whichincreasedintermsofshapesizeandstressvaluewithgobexpanding.Asworkingfaceadvancing,themagnitudeandextentoftheove
7、rburdensubsidencegraduallyenlarged.Itcanbeseenthatthemaximumsubsidencepointinthesubsidencecurveisgraduallymovingtowardstheworkingfaceadvancementdirection.Besides,thesmoothcurveofsubsidencereflectsthatthemonitoringpointsintheoverburdenareallwithintherangeofelasticzo
8、ne,plasticzoneorcavingzone.Thoseresearchresultscanbetakenasreferenceforthesupportingofsurroundingrockinmetalmine.Keywords:miningprocess;overburde
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