基于RFPA2D-Flow的瓦斯抽放钻孔破坏过程数值分析

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1、基于RFPA2D-Flow的瓦斯抽放钻孔破坏过程数值分析林井祥1，孙广义2，(1,2.黑龙江科技大学矿业工程学院，哈尔滨150022)摘要：本文从瓦斯抽放过程中钻孔的塌孔卡钻现象出发，应用RFPA2D-Flow对瓦斯抽放钻孔破坏过程进行了数值模拟，得到了钻孔附近X方向和Y方向的应力曲线，以及在整个破坏过程中钻孔上下两侧孔壁首先被拉裂然后导致破坏向左右两侧孔壁逐渐延伸的发展过程。本文从瓦斯抽放过程中钻孔的塌孔卡钻现象出发，结合RFPA2D-Flow模拟结果分析说明了由于应力集中现象的出现对钻孔周边煤岩体中瓦斯渗透率的影响，并根据钻孔周边应力沿孔壁的变化规

2、律得出了瓦斯沿抽放钻孔周边涌出的发展规律。最后，通过对钻孔周边应力沿孔壁的变化规律和瓦斯涌出时导致的卸压作用的分析，得出了瓦斯抽放钻孔周边煤岩体的破坏是由上下两侧孔壁首先被拉裂然后导致破坏向左右两侧孔壁逐渐延伸的发展过程。本文从瓦斯抽放过程中钻孔的塌孔卡钻现象出发，应用RFPA2D-Flow对瓦斯抽放钻孔破坏过程进行了数值模拟，得到了钻孔附近X方向和Y方向的应力曲线，以及在整个破坏过程中钻孔上下两侧孔壁首先被拉裂然后导致破坏向左右两侧孔壁逐渐延伸的发展过程。关键词：瓦斯抽放；钻孔破坏；平面应变；数值分析中图分类号：TD712NumericalAnaly

3、sisoftheDestroyProcessofGasDrainageHoleBasedonRFPA2D-FlowLinJingxiang1,SunGuangyi2，(1.2.SchoolofMiningEngineering,Heilongjianguniversity ofscienceandTechnology,Harbin150022)Abstract:Inthispaper, StartingfromthePhenomenonofholesubsidinganddrillerblockingingasdrainageprocess,using

4、theRFPA2D-theFlowofgasdrainagedrillingfailureprocessaresimulated,thenearboreholestresscurveofXdirectionandYdirection,andintheprocessofthedamageonbothsidesoftheupanddownholedrillingwallarefirstcrackingandthenleadtodamagetotheleftandrightsidesoftheholewallextendsthedevelopmentproc

5、essofgradually.StartingfromthePhenomenonofholesubsidinganddrillerblockingingasdrainageprocess,ThroughtheanalysisoftheresultsoftheoreticalcalculationandnumericalsimulationofRFPA2D-Flow,theinfluenceofstress-focusphenomenonongaspermeabilityofcoalbodyaroundthehole.Andgasemissiondeve

6、lopmentLawfromdrillinginnerwallwasgiventhroughanalysisofthestressesdistributionofcoalbodyaroundthedrainagehole.Atlast,Failureprocessofcoalbodyaroundthedrainageholewasgiventhroughanalysisofthestressesdistributionofcoalbodyaroundthedrainageholeandthestress-reliefrolecausedbygasemi

7、ssion.Inthispaper, StartingfromthePhenomenonofholesubsidinganddrillerblockingingasdrainageprocess,usingtheRFPA2D-theFlowofgasdrainagedrillingfailureprocessaresimulated,thenearboreholestresscurveofXdirectionandYdirection,andintheprocessofthedamageonbothsidesoftheupanddownholedril

8、lingwallarefirstcrackingandthenleadtodamagetoth