岩土力学2013，Vol.34Issue(3)：659-666,8.
沉井侧壁摩阻力室内试验研究
Model test on sidewall friction of open caisson
摘要
Abstract
The magnitude and distribution of sidewall friction of open caisson are very important to caisson structure design and the selection of sinking-aid methods. However, the computation of sidewall friction is still quite empirical, which often leads to significant deviations from real situation. In order to further understand and master the distribution rule of the sidewall friction of open caisson during the process of sinking, a new type of micro-friction-sensor is invented to measure the sidewall friction directly; and its accuracy, stability and reliability are verified. Then, it is used in model test along with static strain test system. The result shows that the variation characteristics of sidewall friction can be divided into three phases with the increase of sinking depth. In phase one, the increase of sidewall friction and depth is close to linear relation; in phase two, the sidewall friction keeps increasing with depth, yet the rate of increase drops and the value reaches the peak at a particular depth; in phase three, the sidewall friction drops gradually with the increase of depth. The mechanism of this phenomenon is analyzed with theory of limit analysis. The test result can be treated as a complement of in-situ monitoring, and both provides fundamental data for analytical and numerical computation for sidewall friction of open caisson.关键词
沉井/侧壁摩阻力/微型摩阻力仪/模型试验/极限分析Key words
open caisson/ sidewall friction/ micro-friction-sensor/ model test/ limit analysis分类
建筑与水利引用本文复制引用
王建,刘杨,张煜..沉井侧壁摩阻力室内试验研究[J].岩土力学,2013,34(3):659-666,8.基金项目
河海大学水文水资源与水利工程科学国家重点实验室专项基金(No.20095860120) （No.20095860120）
中央高校基本科研业务费专项资金资助(No.B1020083). （No.B1020083）
