路堤荷载作用下高强度桩复合地基土中的应力  

Additional Stresses in High-Strength Pile Composite Foundation under Embankment Load

作　　者：罗强[1] 张敏静[1] 张良[1] 张立祥[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《西南交通大学学报》2010年第5期780-786,共7页Journal of Southwest Jiaotong University

摘　　要：为掌握高强度桩复合地基的荷载传递特性,基于桩土分离的建模原则,采用Mindlin和Boussinesq联合求解法,对路堤作用下地基土中的应力进行了计算,并通过工程实例重点讨论了路堤中心附近地基中桩土应力的分布规律.结果表明:地基加固范围内,桩间土应力沿深度呈"蜂腰"形分布,与实测曲线一致;桩体应力明显大于桩间土应力,表明地基加固区的桩土荷载分担效应显著;下卧层中应力分布与Boussinesq解差别不大,表明在路堤荷载作用下,摩擦型高强度桩复合地基高应力区下移现象不明显.In order to calculate additional stresses in high-strength pile composite foundation,the Mindlin and Boussinesq union method was used.This method calculates the additional stresses caused by pile load and inter-pile soil load separately.Based on test data from a soft foundation,the distribution regularity of the additional stresses around embankment center line in the foundation was emphatically discussed.The research result shows that the distribution of additional stresses along inter-pile soil axis has a ＂wasp waist＂ shape and is in good agreement with measured result.Additional stresses on piles are larger than those in inter-pile soil to indicate an evident load sharing effect in the reinforced area.In underlying strata,additional stresses calculated by the union method are nearly the same as those calculated by the Boussinesq method to indicate that additional stresses do not shift down evidently in a frictional pile composite foundation.

关 键 词：路堤荷载 高强度桩复合地基 土中应力 Mindlin和Boussinesq联合求解法(M&B法) 

分 类 号：TU431[建筑科学—岩土工程]