FLAC在路基边坡稳定性分析中的应用  

The application of FLCA method to the stability analysis of the highway subgrade slope

作　　者：安智敏 李颖 张继军 

机构地区：[1]山东省交通规划设计院,山东济南250031 [2]滨州市公路工程监理咨询公司,山东滨州256614

出　　处：《山东交通科技》2011年第4期44-46,51,共4页

摘　　要：通过使用连续介质快速拉格朗日差分法(Fast Lagrangian Analysis of Continua,简写FLAC)对粉土路基于粘土路基的稳定性进行分析。并对路基高度、地基种类及边坡形式等对路基稳定性产生影响的因素进行分析研究,得出以下规律:路基边坡安全系数随路基高度增大而减小,但此变化存在一临界高度,在此临界高度附近,安全系数以不同的速度减小。如将粉土地基表层30 cm的压实度由85%提高到90%,安全系数将有很大的提高;但由90%提高到93%,则安全系数变化不大。对于10～20 m高度的路基,边坡形式(即一坡式与台阶式)对路基的稳定性影响很小,后者比前者对应的安全系数稍大。Using the application of FLCA(Fast Lagrangian Analysis of Continua,abbreviations order of FLAC)method to analyse the stability of silt subgrade and clay subgrade,and discuss the influencing factors of the height of subgrade,the categories of foundation and the forms of slope to the stability of subgrade.Based on the above research,the following conclusions were drawn from the analysis:The safety coefficient of subgrade slope decreases with the increase of the height of subgrade,but this change exists a critical level,the safety coefficient decreases in different speed near the critical level.Such as the safety coefficient improves a lot when the 30cm compaction of the silt subgrade surface is increased from 85% to 90%,but changed little from 90% to 93%.The forms of slope(slope form and step form)has little influence on the stability of subgrade whose height is from 10m to 20m,the latter has a bigger security coefficient than the former.

关 键 词：道路工程 路基边坡 稳定性 拉格朗日差分法(FLAC) 

分 类 号：U41[交通运输工程—道路与铁道工程]