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1、第30卷第1期巖石力學(xué)與工程學(xué)報(bào)Vol.30No.12011年1月ChineseJournalofRockMechanicsandEngineeringJan.,2011采煤面覆巖破壞動(dòng)態(tài)測(cè)試模擬研究1,212張平松,胡雄武,劉盛東(1.安徽理工大學(xué)地球與環(huán)境學(xué)院,安徽淮南232001;2.中國礦業(yè)大學(xué)深部巖土力學(xué)與地下工程國家重點(diǎn)實(shí)驗(yàn)室,江蘇徐州221008)摘要:利用煤層頂板鉆孔及巷道形成電法測(cè)試系統(tǒng),根據(jù)采動(dòng)速度測(cè)取不同時(shí)期巖層電場(chǎng)變化特征,可對(duì)上覆巖層受采動(dòng)影響的變化規(guī)律進(jìn)行全面分析研究,所獲得的垮落帶和導(dǎo)水裂縫帶(以下簡(jiǎn)稱“兩帶”)高度值對(duì)煤礦安全生產(chǎn)具有重要的指導(dǎo)
2、意義。以井下實(shí)測(cè)煤層為地質(zhì)模型,通過相似模擬技術(shù)構(gòu)建煤層開采條件,結(jié)合孔巷電法系統(tǒng)進(jìn)行測(cè)試模擬與綜合分析,提高對(duì)“兩帶”高度值判斷的準(zhǔn)確性。模擬研究結(jié)果表明,孔巷電阻率法對(duì)巖層采動(dòng)產(chǎn)生的結(jié)構(gòu)變化反應(yīng)靈敏,單次測(cè)試電阻率與背景電阻率比值剖面可有效分辨模型開挖過程中的應(yīng)力超前、巖層變形、破壞等特征,判定垮落帶高度為0.07m,導(dǎo)水裂縫帶高度為0.33m,其相似比例為100,該結(jié)果與井下實(shí)測(cè)值相一致。關(guān)鍵詞:采礦工程;覆巖破壞;孔巷電法;相似模擬;動(dòng)態(tài)測(cè)試中圖分類號(hào):TD32文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1000–6915(2011)01–0078–06STUDYOFDYNAMICDET
3、ECTIONSIMULATIONOFOVERBURDENFAILUREINMODELWORKFACE1,212ZHANGPingsong,HUXiongwu,LIUShengdong(1.SchoolofEarthScienceandEnvironmentalEngineering,AnhuiUniversityofScienceandTechnology,Huainan,Anhui232001,China;2.StateKeyLaboratoryofDeepGeomechanicsandUndergroundEngineering,ChinaUniversityofMini
4、ngandTechnology,Xuzhou,Jiangsu221008,China)Abstract:Throughboreinthetoprockandlaneway,thebore-lanewayobservingsystemisformed.Accordingtominingvelocity,thechangingcharactersofelectricfieldindifferenttimecanbetested;andthechanginglawofoverburdenfailureaffectedbyminingcanbeanalyzedcomprehensiv
5、ely.Theheightof“twobelts”gainedbydetectionishelpfulforsafetyproductionofmine.Usingthepracticalcoalseamasthegeologicalmodel,theminingconditionofcoalseamisfoundthroughthetechniqueofthesimilarsimulation.Thedetectionsimulationisarrangedcombinedwiththebore-lanewayresistivitysystem.Thecomprehensi
6、veanalysisresultcanimprovetheaccuracyfortheheightofthe“twobelts”.Theresearchresultsofsimulationshowthatthebore-lanewayresistivitymethodhassensitivereactiontostructurechangeaffectedbymining.Theresistivityratiosectionofseveraltimeandbackgrounddetectioncanresolveeffectivelythecharactersofstres
7、sexcess,distortionandfailureofrockduringtheprocessofthemodelmining.Accordingtothedetectingresultsinmodelworkface,theheightofcavingzoneis0.07m;andtheheightoffailurezoneis0.33m.Accordingtotheproportionalsimilarityof100,theresultisconsistentwiththepractical