共面闭合断续节理岩体直剪强度特性研究.doc

共面闭合断续节理岩体直剪强度特性研究doi:10,3969/j,issn,1671,7775,2012,05,021共面断续节理岩体直剪强度特性模型1,234,,胡波王思敬刘晓丽(1,,210003;2,,210098;3,国网电力科学研究院南京南瑞集团公司江苏南京河海大学水利水电学院江苏南京中国科学院,1000294,,100084);地质与地球物理研究所北京清华大学土木水利学院北京:,摘要采用理论分析和模型试验相结合方法对共面闭合断续节理岩体直剪强度特性进行分析和,,Mohr-Coulomb,研究引入法向变形协调条件基于理论推导共面断续节理岩体模型的直剪强度公,:-、、式模型试验表明全应力应变曲线主要经历了线弹性增长节理面错动次生裂纹起裂稳态扩、5;,展节理面贯通破坏和残余强度个阶段剪切应力峰值和残余强度都随正应力的增大而增大而;,变形特性随正应力的变化规律性不强抗剪峰值强度随节理连通率的增大而减小低连通率时强度;,;下降速度慢节理分布形态对强度也有影响节理在两边分布的试样强度普遍高于节理在中间的,,理论计算结果与试验值吻合较好能较好描述共面断续节理岩体的直剪强度特征:;;;;-关键词工程岩体断续节理直剪强度岩体力学全应力应变曲线:TV161671,7775(2012)05,0601,:A:中图分类号文献标志码文章编号05Directshearstrengthmodelofrockmasscoplanarwithnemenonsitritttjit1,234HuBo,WangiSjing,LiuXiaoli(1,StateGridElectricPowerResearchsItntute,NanjngNARIGroupCorporaton,Nanjng,Jangsu210003,Chna2,CoegeofWaterConiiiiii;ll-servancyandHydropoweEngrineering,HohaiUniversity,Nanjing,Jiangsu210098,China;3,InstituteofGeologyandGeophysics,ChineseAcademyofSciences,Beijing100029,China;4,yollege,TsinghuaUniversity,Beijing100084,China)Abstract:Accordingtohteoreticalanalysisandmodeltest,theidrectshearstrengbtehhaviorofrockmasswithcoplanarcloseintermittentjointswasinvestigated,patibi-lityequationatnormaldirection,thedirectshearstrengftohrmulationwasdeducedbasedontheMohr-Coulombtheory,pletestresstrsaincurveobtainedfromomdeltests,therearefivetypicalstagesinthefailureprocesswithlinearelasticincrement,slippageofthejoints,steadydevelop-mentofpostcrackng,thecoaescencefaureofdscontnuousjontsandtheresduastrength,The-ililiiiilpeakandersidualstrengthareincreasedbytheincreaseofnormalstresswithpoorrelationshipbetweendefor-mationpropertyandnormalstress,Thepeakstrengthdecreawisteshtheincreaseofthejoint2011,03,20:收稿日期connectivity:(BK200947)9;(1101049C);基金项目江苏省自然科学基金资助项目江苏省博士后科研资助计划项目人保部留学人员科技活动项目(2009003);(2011,33)江苏省企业博士聚集计划项目rate,andthedropvelocityisslowatlowconnectivityrate,Thejointdistributionhasinfluence:(1980—),,,(hubonj@),、,作者简介胡波男湖北黄冈人工程师主要从事岩石力学工程监测研究王思敬(1934—),男,上海人,研究员,中国工程院院士(******@mail,iggcas,),主要从事岩石力学、工程地质研究,onthe,,断续节理岩体因