根式基础竖向承载性能的试验研究  

Experimental study on vertical bearing capacity of root foundation

作　　者：龚维明[1] 胡丰[1] 童小东[1] 殷永高[2] 

机构地区：[1]东南大学土木工程学院,江苏南京210096 [2]安徽省高速公路总公司,安徽合肥230051

出　　处：《岩土工程学报》2008年第12期1789-1795,共7页Chinese Journal of Geotechnical Engineering

基　　金：江苏省自然科学基金项目(BK2008314)

摘　　要：介绍了一种新型变截面基础形式——根式基础。分析了根式基础的受力机理,探讨了根键的挤土效应及抗弯特性对提高基础承载力的作用。采用自平衡法测试了工程用和试验用两个根式基础的承载性能,研究了轴力、侧阻力和根键弯矩的分布规律,比较了压入根键前后承载性能的改变。试验条件下,根式基础较同直径沉井基础承载力可提高85%～115%,沉降减少40%～70%,侧阻比例提高35%～45%。The root foundation, a new type of foundation with variable cross-section, was introduced. The mechanism of vertical beating capacity root foundation was analyzed, and the improvement of beating capacity due to the soil compaction and the bending resistance of roots was discussed. The self-balanced test method was utilized in the field tests to investigate the vertical bearing behavior of a practical root-foundation and an experimental one. The distributions of axial force, side resistance and bending moment of roots were presented. Compared with the traditional caissons, it was indicated that the vertical bearing capacity of root foundation could be increased by 85%-115%, and the settlement was decreased by 40%-70%, and the ratio of side resistance could be improved by 35% ～ 45% under the experimental condition.

关 键 词：根式基础 竖向荷载 承载性能 现场试验 自平衡法 

分 类 号：TU473[建筑科学—结构工程]