多桩型组合桩复合地基承载力的可靠度分析_.pdfVIP

第 25 卷增刊 II Vol.25 Sup.II 工 程 力 学 2008 年 12 月 Dec. 2008 ENGINEERING MECHANICS 168 文章编号：1000-4750(2008)Sup.II-0168-05 多桩型组合桩复合地基承载力的可靠度分析 * 1 1 2 丁继辉 ，袁 满 ，王建国 (1. 河北大学机械与建筑工程学院，河北，保定 071002 ；2. 保定屹元岩土勘察工程有限公司，河北，保定 071002) 摘 要：基于优化桩型的观点，将柔性桩和刚性桩组合，刚性桩和散体材料桩组合，形成多桩型组合桩复合地基， 充分发挥了柔性桩、刚性桩和散体材料桩的优点，弥补了单一桩型在地基处理中的不足。通过对现有多桩型组合 桩复合地基承载力计算方法进行分析，建立了多桩型组合桩复合地基极限承载力可靠度概率分析模型。用 JC 法 进行可靠度计算。通过刚柔组合桩复合地基实例，分析了随机变量的变异性对可靠性指标影响。 关键词：多桩型；组合桩；复合地基承载力；可靠性指标；JC 法 中图分类号：TU311.2 文献标识码：A RELIABILITY ANALYSIS ON THE BEARING CAPABILITY OF COMPOSITE FOUNDATION WITH MULTI-TYPE COMPOUND PILES * 1 1 2 DING Ji-hui , YUAN Man , WANG Jian-guo (1. School of Civil Engineering, Hebei University, Baoding, Hebei 071002, China; 2. Baoding Yiyuan Geotechnical Investigation Limited Company, Baoding, Hebei 071002, China) Abstract: Based on the optimized pile viewpoint, the flexible pile and the rigid pile, the gravel pile and CFG pile are arranged in a group as compound piles, which utilizes their merits and avoids their shortcomings. Through analyzing the calculation methods for the bearing capability of composite foundation with multi-type piles, the reliability probabilistic analytical model of the bearing capability of a composite foundation with multi-type compound piles are set up. JC method is used in the calculation of reliability index of the composite foundation. Through engineering examples, the effects on reliability index from the variability of random variables are discussed. Key word