作　　者： ; ; ; ;

机构地区： 武汉大学土木建筑工程学院

出　　处： 《甘肃工业大学学报》 2003年第2期97-100,共4页

摘　　要： 根据复合桩基极限承载力计算模式,建立了考虑桩基-承台-地基土三者共同相互作用的可靠度极限状态方程.介绍了各基本变量的概率分布和利用JC法求解可靠度指标的过程.针对具体的算例,采用编制的程序对多种工况下承载力可靠指标进行了计算.结果表明:土性参数μφ,μc及其变异系数δφ,δc,承台底土反力群桩效应系数ηc,荷载效应比ρ等指标对复合桩基承载力可靠指标β具有显著影响,其中μφ的显著性强于μc,δφ的显著性强于δc;安全系数K与可靠指标β之间存在对应关系,K越大,β越高,可靠性越大. According to the evaluation mode of limit bearing capacity of compound piling, a limit state equation of reliability for the interaction of associated piling, piling cap, and groundwork soil is setup. The probability distribution of basic variables and the procedure of solution of reliability norms with JC method are introduced, also. A concrete project is taken as example to evaluate the reliability norms of bearing capacity under various working conditions with a computer program developed. The results show that there is a remarkable influence of earthy parameters μφ, μc and their variational coefficients δφ, δc, piling effect coefficient ηc of reation of piling cap's grounding soil, and loading effect ratio ρ on the reliability norm β of compound piling bearing capacity, where μφ or δφ has nore influence than μc or δc, and there is a corresponding relation between safty factor K and reliability norm β that the more the K is, the more the β will be and the more reliable.

关 键 词： 复合桩基 承台 地基土 竖向承载力 可靠度 极限状态方程 法 土性参数 荷载效应比 安全系数

领　　域： [建筑科学] [建筑科学] [理学] [理学] [理学] [一般工业技术]