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ID:37363978
大小:2.39 MB
页数:8页
时间:2019-05-22
《红砂岩短时蠕变声发射b值特征》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、第40卷增刊1煤炭学报Vol.40Supp.12015年6月JOURNALOFCHINACOALSOCIETYJune2015龚囱,李长洪,赵奎.红砂岩短时蠕变声发射b值特征[J].煤炭学报,2015,40(S1):85-92.doi:10.13225/j.cnki.jccs.2014.0253GongCong,LiChanghong,ZhaoKui.Studyonb-valuecharacteristicsofacousticemissionofredsandstoneduringshort-timecreepprocess[J].JournalofChinaC
2、oalSociety,2015,40(S1):85-92.doi:10.13225/j.cnki.jccs.2014.0253红砂岩短时蠕变声发射b值特征1,21,23龚囱,李长洪,赵奎(1.北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083;2.北京科技大学土木与环境工程学院,北京100083;3.江西理工大学资源与环境工程学,江西赣州341000)摘要:岩石的蠕变性质是引起岩石破坏的原因之一。因此,对岩石蠕变破坏进行预测具有重要的意义。通过进行分级加卸载条件下的短时蠕变试验,研究了红砂岩在减速蠕变、等速蠕变与加速蠕变阶段的声发射b值特征。试验
3、结果表明:试件在体积变形状态下,声发射b值在减速蠕变阶段与等速蠕变阶段随着蠕变时间的增大而增大;当试件处于体积不变状态与扩容状态下,声发射b值在等速蠕变阶段总体保持稳定;在加速蠕变阶段,声发射b值呈现出先减小,而后增大,最后再次减小的特征。因此,根据声发射b值在不同蠕变阶段的变化特征,在一定程度上可对红砂岩石蠕变破坏进行预测。关键词:红砂岩;短时蠕变;声发射b值;分级加卸载中图分类号:TU452文献标志码:A文章编号:0253-9993(2015)S1-0085-08Studyonb-valuecharacteristicsofacousticemissionof
4、redsandstoneduringshort-timecreepprocess1,21,23GONGCong,LIChang-hong,ZHAOKui(1.KeyLaboratoryoftheMinistryofEducationofChinaforHigh-EfficientMiningandSafetyofMetalMines,UniversityofScienceandTechnologyBeijing,Beijing100083,China;2.SchoolofCivilandEnvironmentalEngineering,UniversityofSc
5、ienceandTechnologyBeijing,Beijing100083,China;3.SchoolofResourceandEnvironmentalEngineering,JiangxiUniversityofScienceandTechnology,Ganzhou341000,China)Abstract:Thecreeppropertyisoneofthemostimportantfactorsthataffectrockfailure.Therefore,itisnecessarytoforecastrockcreepfailure.Thecre
6、eptestsonredsandstonewerecarriedoutusingsteploadingandunloadingmethod,andthecharacteristicsofb-valueacousticemissionwereanalyzedduringtheprimarycreepstage,thesteadystatecreepstage,andthetertiarystage.Theresultsshowthattheb-valueincreasesinprimarycreepstageandsteadystatecreepstageasthe
7、specimensareinvolumetricdeformationstate,andkeepsstableinsteadystatestageasthespeci-mensareinbothconstantvolumeanddilatancystate.Whenthespecimensstepintotertiarycreepstage,theb-valuefirstlytakesonadecliningtrend,andthenincreaseswithtimeincreasing,andfinallydeclinesagainbeforethespeci-
8、menfa
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