摘要
珠海某一游艇港池垂直岸坡采用大直径薄壁筒桩作为悬臂水平支挡结构,岸坡最大高差达9m。在坡外开挖过程中,筒桩结构发生了整体破坏。该文根据实际工况进行复核,并结合Plaxis软件进行有限元数值计算,分析了该支挡结构失稳破坏的模式和原因。认为破坏的模式为倾覆破坏,筒桩整体刚度较大,桩体绕桩底以上某点转动倾倒。破坏主要原因是由于桩底大多位于淤泥层内,未嵌固于下卧较好的土层,而桩身水平抗弯承载力是可以满足要求的。计算结果与现场实际情况基本相符,并分析了其它导致破坏的不利因素。最后对加固方案设计提出了思路和建议。
The large-diameter thin-walled tubular piles as cantilever retaining structure are adopted to a vertical bank slope of a yacht port in Zhuhai, and the maximal height difference of the slope is 9 meters. The whole structure collapsed during the excavation construction out of the slope. According to the actual condition, combined the numerical calculation with finite element software Plaxis, it analyzes the failure mode and cause of instability. The simulation results indicate that failure mode is overturning, the stiffness of whole tubular pile is larger, and the point of overturning is close to the bottom of the piles. The main failure cause is that most of the piles are located in silt layer,and don＇t embed in adaptive soil layer and the pile＇s horizontal bending bearing capacity is enough. The calculation results and the actual situation are basically the same, other disadvantages are also concluded. Finally the thought and suggestions of re- inforcement design measures are given.
出处
《勘察科学技术》
2013年第6期16-19,共4页
Site Investigation Science and Technology
关键词
大直径筒桩
支挡
倾覆破坏
软土岸坡
PLAXIS
large-diameter tubular pile
retaining
overturning failure
soft soil bank slope
Plaxis
