摘要
吸力式沉箱基础是跨海桥梁基础的一个新选择。基于桥梁基础的受荷特点,考虑不同的荷载作用方式,通过一系列模型试验研究了砂土中吸力式沉箱基础的承载特性。试验结果表明:沉箱的长度越长,吸力式沉箱基础的竖向承载力越大,侧壁摩阻力的贡献越大,而沉箱端部阻力可忽略不计;沉箱的长度越长,吸力式沉箱基础的水平承载力也越高,但相对于竖向承载力而言,基础的水平承载力很小,一般不超过其竖向承载力的5%。预加一定的竖向荷载,可显著提高吸力式沉箱基础的水平承载力,且预加的竖向荷载越大,基础的水平承载力越高,由于桥梁工程中基础承受的竖向荷载很大,所以有必要考虑这一因素对基础水平承载力的提高。
The suction caisson foundation is an alternative foundation for cross-sea bridges. Based on the loading characteristics of the foundation of cross-sea bridges, a series of model tests are carried out to investigate the bearing performance of the suction caisson foundation. Different loading directions are considered in the model tests. The test results show that the vertical bearing capacity of the suction caisson foundation and the contribution of sidewall friction resistance increase with the increasing length of suction, and the tip resistance of caisson can be neglected. The lateral bearing capacity of the suction caisson foundation also increases with the increasing length of suction, but it is small and no more than 5 percent of the vertical bearing capacity. The lateral bearing capacity of the suction caisson foundation can be improved significantly by pre-applied vertical loading, and the bigger the pre-applied vertical loading, the greater the lateral bearing capacity. The factor should be considered in dealing with the large vertical loading in bridge engineering.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2015年第1期177-182,共6页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(50909020)
关键词
吸力式沉箱基础
桥梁
承载力
砂土
模型试验
suction caisson foundation
bridge
bearing capacity
sand
model test
