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ID:37648171
大小:428.87 KB
页数:7页
时间:2019-05-27
《岩石裂隙面粗糙度参数关系分析》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、万方数据第28卷第2期采矿与安全工程学报V01.28No.22011年06月JournalofMining&SafetyEngineeringJune2011文章编号:1673—3363(2011)02—0241—06岩石裂隙面粗糙度参数关系分析郭保华(河南理工大学能源科学与工程学院,河南焦作454010)摘要粗糙度是解释岩石裂隙力学及渗流特性的重要参数.采用自制模具,在轴向中部劈裂岩样,形成垂直于岩样轴向的新鲜裂隙.通过测取7组47个圆柱形岩样裂隙面188条轮廓曲线,分析了粗糙度系数JRC、粗糙轮廓指数R,、粗糙角i、分维D和截距A等参数的相互关系.结果表明:-,RC与岩样组成
2、矿物颗粒大小关系密切,粒径越大,.,RC越大.JRC与R。一1呈明显的对数关系,而不是直线关系;JRC与粗糙角i为正相关关系,由Z。和R。得到的粗糙角i相差不大,当i大于7.2时,后者大于前者,否则,前者大于后者.JRC与截距A近似满足公式-,RC=37.087+16.235A,因此,截距A可以用于描述粗糙度大小.对于同组岩样来说,JRC与分维D负相关,但相关性很低;在除砂岩外的5组岩样之间,粗糙度平均值,RCa。与分雏平均值D。。有较好的正相关关系.总体上,-,RC随尺度增加而增加,而分维D随之增加而降低.关键词岩石力学;岩样;裂隙面;粗糙度参数中图分类号TD313文献标识码A
3、RelationshipAmongSevralRoughnessParametersofRockFractureSurfacesGUOBao—hua(SchoolofEnergyScienceandEngineering,HenanPolytechnicUniversity,Jiaozuo,Henan454010,China)AbstraetRoughnessiSakeyfactortoexplainmechanicalandhydraulicfeatureofrockfrac—ture.Usingtheself-mademold,wesplittherocksamplethro
4、ughthemiddletoproducefreshfractureswhichareperpendiculartotheaxialdirection.188fractureprofilesfrom47cylindricalspecimensofsevenrocksweremeasured.RelationshipamongjointroughnesscoefficientJRC,asperityprofileindexRp,asperityanglei,fractaldimensionsD,andinterceptAwereana—lyzed.Theresultsshowtha
5、ttheJRChasacloserelationwiththesizesofgrainsofrocks,thebiggerthegrainsizeis,thebiggertheJRCis.JRChasalogarithmicrelationshipwithRp-1,butnotalinearrelationship:theJRCispositivelyrelatedtoiandthetWOroughnessanglesiderivedfromZ2andR。respectivelyareclosetoeachother,thelatteroneisalittlelargerwhil
6、eiislargerthan7.2,otherwise,theformeroneislarger.TheJRCandinterceptAmeetap—proximatelytheequationJRC=37.087+16.235A,sothattheinterceptAcanbeusedtore—presentfractureroughness.TheJRChasthelowestnegativecorrelationwithfractaldimensionDforeverygroupofrockspecimenfractures.However,fortheaverageval
7、uesofagroupofspecimen,the_,RC。。andfractaldimensionD。。haveagoodpositivecorrelationamongfivegroupsofrockspecimenfracturesexceptfortWOgroupsofsandstone.Asawhole,theJRCin—creaseswhilethefractaldimensionDdecreaseswithincreaseofprofilesize.Keywords
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