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1、第32卷第9期岩土力学Vol.32No.92011年9月RockandSoilMechanicsSep.2011文章编号：1000－7598(2011)09－2629－07深部洞室围岩分区破裂化的冲击破坏机制研究1,21,21,2陈建功，周陶陶，张永兴（1.重庆大学土木工程学院，重庆400045；2.重庆大学山地城镇建设与新技术教育部重点实验室，重庆400045）摘要：提出了深部洞室围岩分区破裂化的冲击破坏机制。即在岩体开挖引起的围岩应力重分布过程中，径向应力波波前产生应力不连续间断面，当波前应力降满足一定条件时，产生局部冲击破坏。根
2、据弹性动力学理论，应用位移势函数，通过Laplace变换简化计算，推导了洞室开挖瞬间围岩径向应力场的动力学理论解，得到了发生各次分区破裂化时，波前径向应力降的统一计算公式。根据质点速度、间断面压力降，由动量守恒定律推导了围岩分区破裂化的冲击本构方程和破坏准则，得到了产生冲击破坏的间断面压力降临界值计算公式。给出了分区破裂形成后各破裂区半径的表达式，关系式表明，各破裂区之间存在等比关系，其等比值为3。关键词：岩石力学；冲击破坏；深部岩体；分区破裂化中图分类号：TU45文献标识码：AShockfailuremechanismofzonal
3、disintegrationwithinsurroundingrockindeepchamber1,21,21,2CHENJian-gong，ZHOUTao-tao，ZHANGYong-xing（1.CollegeofCivilEngineering,ChongqingUniversity,Chongqing400045,China;2.KeyLaboratoryofNewTechnologyforConstructionofCitiesinMountainAreaofEducationMinistry,ChongqingUniver
4、sity,Chongqing400045,China）Abstract:Theshockfailuremechanismofzonaldisintegrationwithinsurroundingrockindeepchamberisputforward.Thetransientunloadinginsurroundingrockcreatesdynamicactiononrocknearcavernperiphery.Intheprocessofredistributionstressinsurroundingrock,thedis
5、continuityplaneoftheradialstressatwavefrontexistedastheelasticlongitudinalwavemovesahead.Whentheparametersofdiscontinuityplanesatisfycertaincondition,alocalshockdestructionoccured.Basedontheelastodynamicstheory,thedynamicproblemcanbeexpressedbydisplacementpotentialfunct
6、ion;andthegeneralsolutionofmotionequationscanbeobtainedbyusingLaplacetransform.Theradialstressfieldinsurroundingrockinducedbyexcavationisobtained.Theunifiedsolutionofdifferentialpressureatwavefrontisdeduced.Theshockconstitutiveequationandfailurecriteriononzonaldisintegr
7、ationwithinrockmassareanalyzedbasedonparticlevelocity,differentialpressureatwavefrontandconservationofmomentum.Thecrticalvalueofdifferentialpressureatwavefrontisobtainedasshockfailureisgenerated;andtheformulaofradiusofthefracturedzonesisgot.Itshowsthatthereexisttheequal
8、ratiorelationsbetweentheradiiandtheratioofequalityis3.Keywords:rockmechanics;shockfailure;deeprockmasses;zonal
