资源描述:
《考虑变形机制的边坡稳定预测模型》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32卷增刊1岩土力学Vol.32Supp.12011年4月RockandSoilMechanicsApr.2011文章编号:1000-7598(2011)增刊1-0545-06考虑变形机制的边坡稳定预测模型1,21,31,33李聪,姜清辉,周创兵,漆祖芳(1.武汉大学土木建筑工程学院,武汉430072;2.长江科学院水利部岩土力学与工程重点实验室,武汉430010;3.武汉大学水资源与水电工程科学国家重点实验室,武汉430072)摘要:选择开挖卸荷、爆破振动、岩体流变以及降雨作为影响边坡施工期变形的4个主要
2、因素,深入分析不同影响因素对边坡变形的作用机制,结合边坡位移实测资料,建立了考虑变形机制的边坡稳定预测模型。在弹性理论的简化下推导边坡回弹变形公式计算开挖卸荷分量,基于Burger模型的蠕变本构方程计算流变分量,采用已有的经验公式计算爆破分量和降雨分量;综合4个变形分量形成考虑变形机制的边坡稳定预测模型,该模型可体现各影响因素对边坡变形的作用和相关程度,更加科学合理地解释边坡变形产生的力学机制。通过对锦屏一级水电站左岸边坡外观测点TP5变形监测资料的统计回归分析表明:相对于传统的统计模型,该模型的回归方程显著
3、,方差比和复相关系数较大,预测误差较小,具有工程应用价值。关键词:边坡工程;边坡变形;监测;预测;开挖卸荷中图分类号:P642.2文献标识码:AForecastingmodelofslopestabilityconsideringdeformationmechanism1,21,31,33LICong,JIANGQing-hui,ZHOUChuang-bing,QIZu-fang(1.SchoolofCivilandArchitecturalEngineering,WuhanUniversity,Wuhan4
4、30072,China;2.KeyLaboratoryofGeotechnicalMechanicsandEngineeringofMinistryofWaterResources,YangtzeRiverScientificResearchInstitute,Wuhan430010,China;3.StateKeyLaboratoryofWaterResourcesandHydropowerEngineeringScience,WuhanUniversity,Wuhan430072,China;)Abstr
5、act:Excavationunloading,blastingvibration,rockrheologyandrainfallarefourmainfactorswhichaffectthedeformationofslopeduringtheconstructionperiod.Withdeepanalysisofdifferentfactorsonthemechanismofslopedeformation,aforecastingmodelofslopedeformationbasedonthede
6、formationmechanismisobtainedaccordingtoslopedisplacementmonitoringdata.Theformulaofreboundslopedeformationisderivedunderthesimplificationofthetheoryofelasticitywhichisusedtocalculateexcavationunloadingcomponent;creepingconstitutiveequationsbasedonBurgersmod
7、elisusedtocalculaterheologicalcomponent;andblastingcomponentandrainfallcomponentarecalculatedbyusingtheexistingempiricalformula;thefourdeformationcomponentsareintegratedtoformforecastingmodelofslopedeformationbasedonthedeformationmechanism,fromwhichamoresci
8、entificandreasonableexplanationforthemechanicalmechanismofslopedeformationisgot.ThemodelhasbeenusedtoconductstatisticalregressionanalysisofmonitoringdataoftheslopeattheleftbankofJinpingⅠHydropowerStati