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时间:2019-03-03
《硐室围岩力学参数分布特征与可靠性探讨》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、第35卷第10期煤炭学报Vol.35No.102010年10月JOURNALOFCHINACOALSOCIETYOct.2010文章编号:0253-9993(2010)10-1609-06硐室围岩力学参数分布特征与可靠性探讨1,231,23闫春岭,丁德馨,唐益群,毕忠伟(1.同济大学地下建筑与工程系,上海200092;2.同济大学岩土及地下工程教育部重点实验室,上海200092;3.南华大学核资源与安全工程学院,湖南衡阳421001)摘要:利用RMT-150B伺服试验系统对康家湾铅锌金矿Ⅲ-1号矿体上盘围岩进行
2、单轴抗压、抗拉试验,各获得了50个试验结果。分别对这两种试验结果进行检验,结果表明,单轴抗压服从正态分布,抗拉强度服从对数正态分布;利用FLAC软件,对硐室围岩中的应力进行了计算,获得了50个最大主应力和50个最小主应力;采用相同假设检验法,证明最大、最小主应力分别服从对数正态分布和正态分布;根据单轴抗压、抗拉强度及围岩中的最大主应力、最小主应力概率密度函数,计算了硐室围岩不发生拉伸破坏和剪破坏的可靠度;采用随机抽样法,基于小样本试验结果对硐室围岩可靠性的可行性进行了探讨,结果表明,样本个数不能少于总样本数的1
3、/3。关键词:围岩;力学参数;可靠性;概率分布中图分类号:TU457文献标志码:AProbabilitydistributionofmechanicsparametersandreliabilityexplorationofsurroundingrockundergroundchamber1,231,23YANChun-ling,DINGDe-xin,TANGYi-qun,BIZhong-wei(1.DepartmentofGeotechnicalEngineering,TongjiUniversity,Sha
4、nghai200092,China;2.KeyLaboratoryofGeotechnicalandUndergroundEngineeringofMinistryofEducation,TongjiUniversity,Shanghai200092,China;3.SchoolofNuclearResourcesandSafetyEngineering,UniversityofSouthChina,Hengy-ang421001,China)Abstract:Coresweretakenfromhanging
5、walloftheⅢ-1orebodyatKangjiawanLead,ZinkandGoldMine.50com-pressivestrengthvaluesand50tensilestrengthvalueswereobtainedbyusingRMT-150Belectro-hydraulicandservo-controlledtestingsystems.Theprobabilitydistributionsforthecompressivestrengthandtensilestrengthwere
6、tested.Itisproventhatuniaxialcompressivestrengthfollowsnormaldistributionandtheotherfollowsthelognormaldistribu-tion.ThestressofsurroundingrockwascalculatedbyusingFLAC,and50maximumvaluesand50minimumvalueswererespectivelyobtained.Theresultsshowthatmaximumprin
7、cipalstressfollowslognormaldistributionandminimumprincipalstressfollowsnormaldistribution.Thereliabilitieswerecalculatedforsurroundingrocknottofailunderthemaximumcompressivestressesandtheminimumtensilestresses,respectively.Thecalculationresultsshowthattheshe
8、arfailureandthetensilefailurewillnothappen.Randomsamplingwasusedtostudythefeasibilityofusingsmallsampletocalculatethereliabilitiesforsurroundingrocknottofailundermaximumcompressivestressesandmin
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