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ID:52174635
大小:2.63 MB
页数:9页
时间:2020-03-23
《坠落式危岩体稳定性可靠度判定及参数敏感性分析.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、JournalofEngineeringGeology工程地质学报1004-9665/2015/23(3)042909DOI:10.13544/j.cnki.jeg.2015.03.009坠落式危岩体稳定性可靠度判定及参数敏感性分析①①①②①张硕路军富裴向军张博王双(①地质灾害防治与地质环境保护国家重点实验室(成都理工大学)成都610059)(②中石化华北石油工程有限公司录井分公司郑州450000)摘要汶川地震重灾区,由地震触发的地质灾害数量很多,其中危岩体稳定性判定为灾害治理重点工作。基于可靠度理论,针对坠落式危岩体稳定性极限状态特征,建立其可靠度判定概率极限状态方程,并采用现场量测
2、及概率统计方法,对功能函数中危岩破裂面倾角β、危岩等效摩擦角φ、单位长度危岩体重力ω、危岩等效黏聚力c、危岩体高度h等基本变量的均值、变异性及分布形态进行确定。基于以上研究成果,建立了坠落式危岩体稳定性可靠度指标计算方法,同时对各基本变量的可靠度敏感性进行研究,研究结果表明:其敏感性由大到小依次为危岩破裂面倾角β、危岩等效黏聚力c、危岩的高度h、单位长度危岩体重力ω、危岩等效摩擦角φ,研究成果为坠落式危岩体稳定性判定和治理方案设计提供参考依据。关键词坠落式危岩体可靠度数理统计参数敏感性中图分类号:TU457文献标识码:AANALYSISOFPARAMETERSENSITIVITYANDJUD
3、GEMENTOFSTABILITYRELIABILITYFORFALLINGUNSTABLEROCK①①①②①ZHANGShuoLUJunfuPEIXiangjunZHANGBoWANGShuang(①StateKeyLaboratoryofGeohazardPreventionandGeoenvironmentProtection,ChengduUniversityofTechnology,Chengdu610059)(②SinopecHuabeiPetroleumEngineeringCompanyLimitedLoggingBranch,Zhengzhou450000)Abstract
4、IntheharderhitearthquakeareassuchasWenchuan,theconstancyofunstablerockisconsideredasakeyworkofthedisastercontrolbecausetherearemanykindsofgeologichazardscausedbytheearthquake.Thispaperisbasedonthereliabilitytheoryandusesthelimitstatecharacteristicsoffallingunstablerocks.Itestablishestheequationofc
5、onstancyjudgingprobabilitylimitstate.Italsodeterminesthemeanvalue,variabilityanddistributionshapeoftheunstablerockangleβofrupture,theunstablerockangleφofequivalentinternalfriction,weightperunitlength,equivalentcohesion,heightandotherbasicvariablesinthefunctionsbymeansoffieldmeasurementandprobabilit
6、ystatistics.Basedonthesestudies,thepaperdevelopsthecalculationmethodoffallingunstablerockstabilityreliabilityindex.Atthesametime,itstudiestheparametersensitivityofeachbasicvariable.Theresultshowsthatthevariablesindescendingorderfromhightolowsensitivityaretheunstablerockangleβofrupture,theequivalent
7、cohesion,theheight,theweightperunitlengthandtheangleφofequivalentinternalfriction.Theresultoffersareferenceinjudgingtheconstancyofunstablerockanddesigningofaregulationscheme.KeywordsFallingunstablerock,Reli
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