水平加筋与散体材料桩组合型复合地基承载力计算  

Bearing Capacity of Two-dimensional Reinforced Composite Foundation

作　　者：杨宇[1] 陈昌富[2] 赵明华[2] 

机构地区：[1]交通部公路科学研究院 [2]湖南大学土木工程学院,湖南长沙410082

出　　处：《公路交通科技》2008年第6期35-39,49,共6页Journal of Highway and Transportation Research and Development

基　　金：国家高技术研究发展计划(863计划)资助项目(2006AA11Z104);湖南省自然科学基金(03JJY3087);湖南省科技攻关资助项目(02GKY3024)

摘　　要：研究了单层水平加筋与散体材料桩组合型复合地基的承载力计算方法。在同时考虑水平向加筋体的约束作用及桩土接触面存在剪切力的基础上,依据极限平衡条件推导出水平向加筋和散体材料桩双向组合型复合地基承载力计算公式,可以同时考虑水平加筋以及桩体和土体重力对地基承载力的贡献。通过工程实例,探讨了土体的内摩擦角、粘聚力、桩土接触面的摩擦角以及水平加筋对复合地基承载力的影响。分析结果表明,提高土体的内摩擦角、粘聚力、桩土接触面的摩擦角等可以提高复合地基承载力;其他条件相同时,桩顶设置水平加筋层后,地基承载力可以得到较大提高。The bearing performance of both vertically and horizontally reinforced composite foundation formed by horizontal reinforcement settled on top of granular piles, which could restrict the failure of granular piles, was studied.With the consideration of restriction of horizontal reinforcement and the friction between the pile and the inter-pile soil, the bearing capacity formula of composite foundation reinforced with horizontal reinforcement and vertical piles according to limit equilibrium condition was derived, which could well consider the effect of horizontal reinforcement, vertical piles and soil＇ s gravity on composite foundation bearing capacity. A case study was given and the influence of different parameters on bearing capacity of composite foundation was discussed. The results show that the bearing capacity of such composite foundation increases with increase of internal friction, cohesion of soils and the friction angle between the pile and the inter-pile soil. Besides, the bearing capacity increases to a certain level with the existence of horizontal reinforcement on top of granular piles.

关 键 词：道路工程 复合地基 极限平衡法 承载力 加筋 碎石桩 

分 类 号：U416.1[交通运输工程—道路与铁道工程] TU470.3[建筑科学—结构工程]