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时间:2019-05-12
《矿井岩体破坏突水机制及非线性渗流模型初探》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27卷第7期岩石力学与工程学报Vol.27No.72008年7月ChineseJournalofRockMechanicsandEngineeringJuly,2008矿井岩体破坏突水机制及非线性渗流模型初探11122杨天鸿,陈仕阔,朱万成,孟召平,高延法(1.东北大学岩石破裂失稳研究中心,辽宁沈阳110004;2.中国矿业大学资源与地球科学系,北京100083)摘要:矿山采动围岩破坏突水过程中,水流经历了在含水层中的Darcy层流、破碎带中的非Darcy快速流以及进入巷道中的Navier-Stokes紊流3
2、个物理过程。研究表明Brinkman方程比较适合破碎带渗流特点;同时,将含水层Darcy渗流和巷道N-S流动有机联系在统一流动场中,基于质量守恒和压力平衡,建立突水流体流动数值模型。据此,以采动诱发陷落柱突水为例,应用COMSOLMultiphysics系统数值分析工具,通过在模型中耦合Brinkman,Navier-Stokes和Darcy方程,把含水层、岩体破碎带和巷道整个突水水流路径连接在一起,模拟突水流动全过程。计算结果表明,陷落柱作为含水层渗流和巷道突水自由流动的过渡区域,其渗透性变化对于突水压力和流
3、速演变十分敏感,陷落柱或导水破碎带沟通了含水层和巷道之间的水力联系,而含水层充足的补给水量是保持恒定的高水压并沿陷落柱形成突水的根源。关键词:采矿工程;破碎岩体;突水;数值模型中图分类号:TD35文献标识码:A文章编号:1000–6915(2008)07–1411–06WATERINRUSHMECHANISMINMINESANDNONLINEARFLOWMODELFORFRACTUREDROCKS11122YANGTianhong,CHENShikuo,ZHUWancheng,MENGZhaoping,GAOY
4、anfa(1.ResearchCenterforRockInstabilityandSeismicity,NortheasternUniversity,Shenyang,Liaoning110004,China;2.DepartmentofResourcesandGeoscience,ChinaUniversityofMiningandTechnology,Beijing100083,China)Abstract:Thewaterinrushinminesmayexperiencethreeprocessesi
5、ncludingDarcyflowinaconfinedaquifer,non-DarcyflowinfracturedzoneinfaultandNavier-Stokes′turbulentflowintunnel.Awater-inrushmodel,inwhichtheBrinkmanequationisthoughttobesuitablefordescribingthefluidflowinthefracturedzoneinfault,andalsotheDarcyequationandtheNa
6、vier-Stokes′sequationarereceptivelyusedtocharacterizetheflowinconfinedaquiferandintunnel,isproposedbasedonconservationofmassandpressurebalance,inordertopredictthehydraulicprocessesduringthewaterinrush.Thismodelisconsideredtobepromisingandpracticalforcharacte
7、rizingthewholefluidflowandwater-inrushprocesses.Then,asatypicalexample,thewater-inrushduetokarsticcollapsecolumns,whichisconsideredtobeacoupledprocessesthatcanbecharacterizedwithDarcyequationinconfinedaquifer,BrinkmanequationinfracturedzoneandNavier-Stokes′s
8、equationintunnel,issimulatedwhentheabove-proposedmodelisimplementedintoCOMSOLMultiphysics.Thecompletefluidflowprocessinconfinedaquifer,fracturedzoneandtunnelareallnumericallypredicted.Thenumeric
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