摘要
对沉井的下沉进行分析,指出刃脚处所受的土压力为被动土压力,井壁所受的土压力为主动土压力或静止土压力。根据地基破坏理论,将与沉井同时移动的压实核作为基础的一部分,从位移、刃脚和土的物理力学性质等方面进行分析,指出沉井刃脚所受的被动土压力介于静止土压力与被动土压力极限值之间。由被动土压力折减系数,推导出被动土压力与侧摩阻力的计算公式。依据该计算公式对地下旋流池的结构进行分析和比较。指出沉井刃脚高度以及刃脚踏面的宽度对沉井的侧摩阻力和下沉系数影响较大。
The process of sinking open caisson was analyzed. The earth pressure on the foot blade of a open caisson was the passive earth pressure, while the earth pressure on the wall of a open caisson was the active earth pressure or the earth pressure at rest. Based on the theory of failure of subsoil, the compressed core sinking with the open caisson was regarded as part of the foundation, then the displacement of soil, the height and the width of the foot blade of a open caisson and the changes of the properties of soil were analyzed in the process of sinking of open caisson. The value of passive earth pressure on the foot blade of open caisson varied between the value of the earth pressure at rest and the limit value of passive earth pressure. Based on the coefficient of passive earth pressure, the formulas of passive earth pressure on open caisson and lateral friction of sinking open caisson were given. Using these formulas, the structure of a underground whirling pool in a factory was analyzed and compared. It is pointed out that the height and the width of the foot blade of open caisson have great influence upon the lateral friction and the coefficient of sinking.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2005年第11期1341-1345,共5页
Chinese Journal of Geotechnical Engineering
基金
湖南省教育厅科研资助项目(04C032)
关键词
位移
被动土压力
折减系数
侧摩阻力
刃脚
displacement
passive earth pressure
reduced coefficient
lateral friction
foot blade
