摘要
吸力沉贯是复合筒型基础安装的关键环节之一,施加的吸力值决定安装的成败.施加吸力值过小,无法下沉,吸力值过大容易发生渗透破坏,造成安装失败.本文通过室内模型试验研究了复合筒型基础在不同深度处的临界负压,并与现有的理论公式进行了对比分析.结果表明,适用于单筒基础的临界负压公式计算得到的吸力值小于试验中测得的临界负压,SR公式可以用于预测沉放过程的临界负压.试验发现加载等级对复合筒型基础临界负压的影响较小.基于试验结果对现有筒型基础的临界负压公式进行了修正,为复合筒型基础模型试验的安装提供支撑.
Suction penetration is one of the key stages in the installation of composite bucket foundation,and the suction applied determines the success or failure of the installation.If the suction value is too small,it can not sink.If the suction value is too large,it may cause seepage damage,resulting in installation failure.In this paper,the critical suction of composite bucket foundation at different depths was studied by model test,and compared with the existing theoretical formula.The results show that the suction calculated by the critical suction formula suitable for single bucket foundation is smaller than the critical suction measured in the experiment,and the SR formula could be used to predict the critical suction in the process of sinking.The test found that the loading level has little effect on the critical suction of composite bucket foundation.Based on the experimental results,the critical suction formula of the existing bucket foundation is modified to provide support for the installation of the composite bucket foundation model test.
作者
丁红岩
许云龙
张浦阳
乐丛欢
Ding Hongyan;Xu Yunlong;Zhang Puyang;Le Conghuan(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300350,China;School of Civil Engineering,Tianjin University,Tianjin 300350,China)
出处
《天津大学学报（自然科学与工程技术版）》
EI
CAS
CSCD
北大核心
2022年第6期603-610,共8页
Journal of Tianjin University：Science and Technology
基金
国家自然科学基金资助项目(51779171).
关键词
复合筒型基础
沉贯
临界负压
渗透破坏
composite bucket foundation
penetration
critical suction
seepage failure
