泥巴山超长深埋隧道岩爆形成条件及危险性预测研究

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1、西南交通大学硕士学位论文泥巴山超长深埋隧道岩爆形成条件及危险性预测研究姓名：周霜林申请学位级别：硕士专业：岩土工程指导教师：邓荣贵20090401西南交通大学硕士研究生学位论文第1l页岩爆洞段不连续，沿隧道呈带状分布。利用有限元分析预测分析了隧道完整围岩洞段的岩爆可能性，结果显示完整坚硬围岩均有可能产生岩爆，其中埋深较浅的隧道段可能产生弱岩爆或中等强度岩爆。关键词：泥巴山隧道；岩爆：地应力；岩爆预测西南交通大学硕士研究生学位论文第1Il页AbstractNibamountainstunnelis10007m

2、long，buried1701mdeep，withcomplicatedgeologiccondition，locatedindeep—shearedhigh_middlemountainareaswithrelativehightdifferenceof2100m，insoutheastof‘Y’tectoniczoneinwestpartofSichuanwithactivetectonicactivities，complicatedfaultzoneandhighin-situstress．Tunne

3、lwallrockisstrongandbrittle，withthepropertiesofrockburst．贴ileexcavatingthetunnel。thestressofwallrockwillbere—distributed。bywhichthestresscentralizationwillbeincreased．Thus，tunnelwallrockhastheinternalandexternalconditionsforrockburst，whichisoneofthemainpot

4、entialengineeringhazardsinthistunnel．Studyonregionalgeologicenviornmentalcondition，rockjointandengineeringproperty，tunnelareain—situstresssite，rockphysical—mechanicalproperty，andwallrockstresspropertyinNibamountaintunnelarea，thisasseyforcaststherockburstpr

5、opertyanddanger，andconcludesasfollows：(1)Faultdipofanticlinaleastlimbfaultzoneintunnelareaismainlywest—dipping，however，dipofanticlialwest1imbfaultzoneismainlyeast—dipping，whichreflectsthatfaultzoneandfoldisdeeplycontactedintheformationandcontroloftectonicf

6、ramework．Tunnelareahassufferedatleastfour-termbiggergeogolicaltectonismindifferentdirection，roak—layerisfoldanddeformed，faultisdeveloped．Withhighercurrenttectonicstress，itconformstohighin—situenviormentalconditionforrockburstandisgoodforrockburstdevelopmen

7、t．(2)Intunnelrarea，therockmassismorecomplete～extremelyfractured，therockmassstructureisdividedintoblockstructure，inlaidcataclasticstructure，cataclasticstructure，scatteredstructure，andincompactstructure．Excepttherockinfracturedzoneissofter，therockinotherpart

8、ismuchstronger．Theaveragevalueofuniaxialcompressivestrengthofcompleterhyolitereaches98．2MPa，thevalueisbiggerwhile西南交通大学硕士研究生学位论文第1V页burieddeeper．ItshowsthatNibamountaintunnelwallrockconformstorockconditionofr