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1、含瓦斯煤破壞形式與瓦斯突出機(jī)理繆協(xié)興1,2、岳建華3、陳占清1,3(1巖土力學(xué)與地下工程國(guó)家重點(diǎn)實(shí)驗(yàn)室(中國(guó)礦業(yè)大學(xué)),徐州;2中國(guó)礦業(yè)大學(xué)理學(xué)院,徐州;2中國(guó)礦業(yè)大學(xué)資源與地球科學(xué)學(xué)院,,徐州)摘要:闡述了含煤破壞形式和流動(dòng)法則,在此基礎(chǔ)上,運(yùn)用時(shí)變邊界系統(tǒng)動(dòng)力學(xué)的觀點(diǎn)解釋了瓦斯突出機(jī)制。含瓦斯煤在剪切屈服后,流動(dòng)是雙向的,而在拉伸破壞后,流動(dòng)是單向的,因此不宜將含瓦斯的破壞及流動(dòng)用統(tǒng)一的法則表達(dá)出來(lái)。突出是由破壞引起的煤層邊界時(shí)變過(guò)程;是否發(fā)生突出,取決于邊界時(shí)變過(guò)程中瓦斯的運(yùn)移情況:如果在煤層破壞過(guò)程中,裂隙連通、瓦斯可以暢通地運(yùn)移,
2、則不會(huì)在破裂區(qū)積聚瓦斯能量,從而不會(huì)發(fā)生突出;如果裂隙不連通,或者地應(yīng)力造成裂隙閉合,并且瓦斯壓力的自密封作用使多層球殼狀的破裂區(qū)維持一種具有一定承載能力的結(jié)構(gòu),則當(dāng)瓦斯能量集聚到一定限度時(shí),就造成球殼狀結(jié)構(gòu)失穩(wěn),并發(fā)生瓦斯突出。關(guān)鍵詞:時(shí)變邊界系統(tǒng)動(dòng)力學(xué),瓦斯突出,含瓦斯煤,破壞,流動(dòng)ThefailuremodesofcoalcontaininggasandthemechanismofgasoutburstMiaoXiexing,ChenZhanqing,YueJianhua(1StateKeyLaboratoryforGeomechan
3、icsandDeepUndergroundEngineering(ChinaUniversityofMiningandTechnology),Xuzhou;2SchoolofScience,ChinaUniversityofMiningandTechnology,Xuzhou;SchoolofEarthandGeoscience,ChinaUniversityofMiningandTechnology,Xuzhou)Abstract:Ontheexpatiationonthefailuremodeandflowruleofcoalconta
4、ininggas(CCG),themachanismforgasoutburstisexplainedbyusingdynamicsofsystemswithvariableboundaries.TheflowofCCGpostshearingsubmittalisbilateralflow,andtheflowposttensionfailureisunilateral,soitisunfavorabletoformulatetheruleofbothfailureandflowofCCGinanidenticalplasticpoten
5、tialfunction.Gasoutburstissuchaprocessinwhichtheboundariesofcoalseamarevariablebecauseofthefailureofcoal.Whethertheoutbursttakesplaceisdecidedbythemigrationofgascontainedinthecoalseamduringtheprocess.Duringthefailureofcoalseam,ifthefracturesareconnectedeachotherandthegasca
6、nmigratefreely,thennoaccumulationofenergyexistsinthefracturedzones,andgasoutburstdoesnottakeplace;Contrarily,ifthethefracturesarenotconnectedeachotherorevenclosedowingtogroundstress,thethefracturedzonewhichtakesontheformofsphericalshellswithmanylayerswillremainacertaincarr
7、yingcapacitybecauseoftheSelf-sealingofthepressureofgas.Whentheaccumulationofenergyofgasachievesalimit,thestructurewithsphericalshellswillbeinstable,andgasoutbursttakesplace.基金項(xiàng)目:國(guó)家重大基礎(chǔ)研究發(fā)展計(jì)劃(973)2005CB;國(guó)家自然科學(xué)基金重點(diǎn)項(xiàng)目Keywords:DynamicsofSystemswithvariableboundaries,gasoutburs
8、t,coalcontaininggas,failure,flow煤與瓦斯突出是破碎的煤與瓦斯由煤體內(nèi)突然向采掘空間大量噴出,是煤礦生產(chǎn)過(guò)程中最為嚴(yán)重的災(zāi)害之一[1]。從力學(xué)上講,