大直径钢圆筒振动下沉可行性分析方法  

Feasibility analyzing method of vibration sinking of large diameter steel caissons

作　　者：胥新伟[1] 刘亚平 高潮[1] 

机构地区：[1]中交天津港湾工程研究院有限公司,天津300222 [2]中交第一航务工程局有限公司,天津300461

出　　处：《中国港湾建设》2016年第4期9-11,共3页China Harbour Engineering

基　　金：国家支撑计划课题项目(2011BAG07B02)

摘　　要：港珠澳大桥东、西人工岛岛壁结构采用直径22 m的钢圆筒围堰构成,通过APE600振动锤组振沉至设计标高。为确定钢圆筒振动下沉的可行性,将钢圆筒视为桩并划分为单元,确定桩侧动摩阻力与桩身振动加速度之间的关系,计算得到不同入土深度位置的桩侧振动加速度,同时考虑应力波在桩身的传递,最终获得桩在不同时刻的动摩阻力,并通过桩端单元的振动加速度计算得到桩端最大振幅,当振动锤激振力能够克服桩侧动摩阻力及端阻力,且桩端产生的最大振幅大于土体处于弹性阶段的最大位移时桩可继续下沉。The east and west artificial islands of Hongkong-Zhuhai- Macao Bridge project were formed by 22 m diameter steel caissons which were installed to design evaluation by vibratory system consist of APE600 vibratory pile driver. To determine the feasibility of steel caisson vibration sinking, we divided the caisson into small units as a pile, determined the relationship between the friction and acceleration of the pile, and calculated the accelerations and dynamic friction of different unit. And the resistance of the pile in different time and the max amplitude at the end of the pile could be obtained. As the exciting force of the vibratory system was greater than the summary of dynamic friction force and resistance at the bottom of the caisson, and the max amplitude at the bottom of the caisson was greater than the elastic displacement of the soil, the pile could continue to sinking.

关 键 词：钢圆筒 振动下沉 可行性分析 振动锤 波动方程 动土阻力 

分 类 号：U655.553[交通运输工程—港口、海岸及近海工程] TU473.2[交通运输工程—船舶与海洋工程]