采动影响下强充水型隐伏岩溶陷落柱的围岩变形与渗流场数值模拟

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1、采动影响下强充水型隐伏岩溶陷落柱的围岩变形与渗流场数值模拟•5•采动影响下强充水型隐伏岩溶陷落柱的围岩变形与渗流场数值模拟摘要：通过引入孔隙水作用于围岩的体积力项，采用弹塑性本构模型和达西渗流模型，有限元数值模拟和分析了存在一穿透煤层的强充水型隐伏岩溶陷落柱时的带压开采过程中，煤层围岩的变形和渗流场随采煤工作面逐步接近陷落柱时的变化规律，探讨了孔隙水压力对围岩变形的影响，并分析了在存在岩溶陷落柱条件下的合理防水煤柱预留距离。数值模拟结果可为含特殊地质构造煤层的开采设计提供依据，同时为进一步的流固耦

2、合作用和煤层底板突水机理的研究以及防水煤柱的留设提供一定的参考。关键词：带压开采；陷落柱；底板突水；流固耦合NUMERICALSIMULATIONONROCKDEFORMATIONANDSEEPAGEFIELDWITHAFULLY-WATERKARSTICCOLLAPSECOLUMNUNDERMININGINFLUENCEAbstract：Duetothegreateconomiclossandsecuritythreat,waterinrushincoalminingisdrawingmorea

3、ndmoreattention.Consideringthecomplicatedengineeringgeologicalandhydrologicalconditions,numericalsimulationisplayinganimportantroleforthemechanismresearchofcoalwaterinrush,especiallyinthecaseofexistenceofkarsticcollapsecolumns.Thecouplingeffectbetween

4、theconfinedwaterandtheconfiningrockisnotneglectableconcerningwiththedeformationanddamageofrockinthecoalmining.Thedeformationofconfiningrockandtheseepagefieldofporewaterwithafully-waterkarsticcollapsecolumnintheprocessofcoalminingissimulatedbyfiniteele

5、mentmethod,inwhichelasto-plasticconstitutivemodelforthecoallayerandtheconfiningrockandDarcy’sseepagemodelforporewaterareadopted.Thebodyforcetermisintroducedtodescribetheinfluenceofporewaterpressureonthedeformationofconfiningrock.Thevaryingcharacterist

6、icsofstress,plasticdeformationandseepagevelocityalongwiththeminingprocessaregiven.Thedamagedareasintheconfiningrockandthecoallayeralongwiththedecreaseofthedistancebetweentheminingfaceandthekarsticcollapsecolumnsarecomputed,andthedistancefromtheminingf

7、acetothekarsticcollapsecolumnsneededasthereservedcoalcolumnforpreventionofwaterinrushisalsoquantitativelygiven.Besides,theresultsfortwocases,onewiththeexistenceofthebodyforcetermandanotherwithouttheexistenceofthebodyforceterm,arecomparedtoshowtheeffec

8、tofsolid-liquidcoupling.Theresultishelpfulforcoalminingdesignundercomplicatedgeologicalstructure.Itisalsousefulforfurtheranalysisonfluid-solidcoupling,forstudyingonthemechanismofwateroutrushfromcoalfloor,aswellasforproperdesigningofcoalpillart