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时间:2020-06-24
《非均匀应力场下巷道围岩弹塑性分析_潘阳 (1).pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、DOI:10.13225/j.cnki.jccs.2011.s1.021第36卷增刊1煤炭学报Vol.36Supp.12011年5月JOURNALOFCHINACOALSOCIETYMay2011文章编号:0253-9993(2011)S1-0053-05非均匀应力场下巷道围岩弹塑性分析11,21潘阳,赵光明,孟祥瑞(1.安徽理工大学能源与安全学院,安徽淮南232001;2.重庆大学西南资源开发及环境灾害控制工程教育部重点实验室,重庆400044)摘要:根据岩石材料的变形特性,引入了在实际工程中对巷道围岩具有一
2、定影响的参数,采用岩石应力-应变三线段力学模型,分析了非均匀应力场下圆形巷道围岩弹性区、塑性软化区、塑性残余区的力学形态,推导出了非均匀应力场下圆形巷道弹塑性的理论解。在此基础上给出具体算例,分析了不同的影响因素对巷道围岩的影响。通过实例表明:岩石的侧压系数、应变软化、支护压力对围岩的力学形态、塑性区大小都有很大的影响;随着侧压系数的增加,巷道两帮处的塑性区范围在减小;软化模量的降低可以减小塑性区的半径;支护压力增加也可以减小塑性区半径。了解岩石的侧压系数,控制岩体的软化模量,适时加大支护压力均能有效地控制巷道
3、围岩的稳定性。关键词:非均匀应力场;巷道围岩;弹塑性解;应变软化;侧压系数中图分类号:TD322文献标志码:AElasto-plasticanalysisonsurroundingrockmassundernon-uniformstressfield11,21PANYang,ZHAOGuang-ming,MENGXiang-rui(1.SchoolofMiningandSafety,AnhuiUniversityofScienceandTechnology,Huainan232001,China;2.KeyLa
4、boratoryfortheExploitationofSouthwesternResources&theEnvironmentalDisasterControlEngineering,MinistryofEducation,ChongqingUniversity,Chongqing400044,China)Abstract:Accordingtothedeformationcharacteristicsofrockmaterial,introducedsomeparameterswhichinpractica
5、lprojectsforsurroundingrockhascertaininfluence,usingrocksstress-strainthreelinesmechanicalmodel,mechanicalbehaviorsofthenon-uniformstressfieldofcirculartunnelselasticzone,plastic-softeningzone,plastic-residualzonewereanalyzed,andthenon-uniformstressfieldofci
6、rculartunnelselasto-plastictheoreticalsolutionwasdeduced.Basedonaconcreteexamplegave,analyzeddifferentaffectingfactorsontheinfluenceofthesurroundingrock.Throughexamplesshowthatthesidepressurecoefficient,strainsoftening,supportingpressureoftherockhavelargeeff
7、ectonsurroundingrockmechanicsbehaviorsandplasticzone.Alongwiththeincreaseofsidepressurecoefficient,twosidesroadwayinplasticzonerangedecreases;softeningmodulusoflowercanreducetheradiusofplasticzone;supportingpressureincreasescanalsoreducetheplasticzoneradius.
8、Understandtherocksidepressurecoefficient,thecontrolofrocksofteningmodulus,timelyincreasesupportingpressurecaneffectivelycontrolthestabilityofsurround-ingrock.Keywords:non-uniformstressfield;surr
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