滑面正应力分布对边坡安全系数的影响.pdf

第25卷第7期岩石力学与工程学报Vol.25No.72006年7月ChineseJournalofRockMechanicsandEngineeringJuly2006滑面正应力分布对边坡安全系数的影响刘华丽12朱大勇2钱七虎2周先华2(1.中国科学院武汉岩土力学研究所湖北武汉430071；2.解放军理工大学工程兵工程学院江苏南京210007)摘要：极限平衡法计算边坡安全系数的结果依赖于滑面正应力分布的假设研究滑面正应力分布对安全系数的影响具有重要的理论意义。采用五点插值三次样条函数构造出滑面正应力多种分布形式分别求解对应的满足整体力和力矩平衡条件的安全系数比较其差别并验证其内力分布的合理性。算例研究表明滑面正应力分布的不同对边坡安全系数影响差别达19%左右；验证条间力分布合理性后其差别可减小到7%以内。关键词：边坡工程；稳定；安全系数；极限平衡法中图分类号：P642文献标识码：A文章编号：1000–6915(2006)07–1323–08EFFECTOFNORMALSTRESSDISTRIBUTIONONFACTOROFSAFETYOFASLOPELIUHuali12ZHUDayong2QIANQihu2ZHOUXianhua2(1.InstituteofRockandSoilMechanicsChineseAcademyofSciencesWuhanHubei430071China；2.EngineeringInstituteofEngineeringCorpsPLAUniversityofScienceandTechnologyNanjingJiangsu210007China)Abstract：Thefactorofsafetyofaslopebasedonlimitequilibriummethodislargelydependentupontheassumptionregardingthedistributionofnormalstressesontheslipsurface.Thusinvestigationoftheeffectofthisdistributiononthefactorofsafetyisofpracticalsignificance.Aseriesofnormalstressdistributionsarerepresentedbyacubicsplinefunctionwithfivediscretepointsandtheassociatedfactorsofsafetyarecomputedaccordingtotheforceandmomentequilibriumconditionsforthewholeslidingbody.Comparisonsaremadebetweenthedifferencesinvaluesoffactorsofsafetyandthereasonablenessoftheinternalforcesischecked.Examplestudiesshowthatthemaximumdifferencesinvaluesoffactorsofsafetywithdi