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时间:2020-04-23
《确定岩石节理Maksimovic峰值抗剪强度准则中“粗糙度角??”的新方法-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第35卷第2期岩土力学、,01.35NO.22014年2月RockandSoilMechanicsFeb.20l4文章编号l1000-7598(2014)02-0551-05确定岩石节理Maksimovic峰值抗剪强度准则中“粗糙度角△"的新方法唐志成1,2刘泉声1,夏才初2吴月秀,黄继辉2,王春波2(1_武汉大学土木建筑工程学院,武汉430072;2.同济大学地下建筑与工程系,上海200092)摘要:岩石节理的非线性Maksimovic峰值抗剪强度准则,采用双曲线函数描述不同法向应力作用下剪胀角的变化,参数物理含义明确、适用的法向应力范围广且形式简洁。采用的参量“粗糙度角△”
2、反映节理的粗糙程度,但由至少3组直剪试验数据回归分析确定,因此,不能采用该准则估算节理的峰值抗剪强度。通过等价关系,由已有的峰值抗剪强度准则得到用三维形貌参数表示的“粗糙度角Ago”,提出含三维形貌参数的Maksimovic峰值抗剪强度准则。采用不同形貌节理的直剪试验数据对准则进行了验证,结果表明,计算值与试验值吻合较好,验证了公式的正确性;同时,亦与经典的Barton准则进行了对比。可用该准则预估节理的峰值抗剪强度。关键词:岩石节理;峰值抗剪强度;粗糙度;三维形貌参数;粗糙度角中图分类号:Tu44文献标识码:AAnewmethodforcalculatingroughness
3、angle△inMaksimovicpeakshearstrengthcriterionofrockjointsTANGZhi—cheng,,LIUQuan—sheng,XIACai—chu2,WUYue.xiu,HUANGJi.hui。,WANGChun—bo(1.SchoolofCivilandArchitecturalEngineering,WuhanUniversity,Wuhan430072,China;2.DepartmentofGeoteehnicalEngineering,TongjiUniversity,Shanghai200092,China)Abstrac
4、t:Anonlinearpeakshearstrengthcriterion,proposedbyMaksimovic,Hsesasimplehyperbolicfunctiontodescribethepeakdilatancyangleunderdiferentnormals~esses.Themodelhassignificantadvantages,suchasparametershavephysicalmeaning,lawisvalidfromzerotoinfinity,anditissimplerfromtheviewofmathematicalpoint.Th
5、eroughnessofjointsurfaceisexpressedbytheparameterof“roughnessangle,Ago”,obtainedbyusingtheleastsquarefitmethodonbasisofatleastthreesetsofmeasureddata.ItisnoteasytousetheMaksimoviccriteriontopredictthepeakshearstrengthofrockjoints.Inthispaper,theroughnessangleisdeterminedbyarationalmethodwith
6、aquantitativethreedimensionalmorphologyparametersofjointsurface.Then,amodifiedMaksimovicpeakshearstrengthcriterionisproposed.Severalexperimentalresultsareusedforverificationoftheproposedrelations.Itisshownthatthecalculatedvaluesareingoodagreementwiththemeasureddata.Italsopresentsthecompariso
7、nbetweenthenewcriterionwiththefamousBarton’Scriterion.WeCanusetheproposedcriterionasausefultooltopredictthepeakshearstrengthforrockjoints.Keywords:rockjoints;peakshearstrength;roughness;three—dimensionalmorphologyparameters;roughnessangle学行为较为复杂,微凸
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