软土地区高桩承台结构桩基内力及变形分析  

Analysis of internal force and deformation for pile foundation of elevated pile cap structure in soft soil area

作　　者：于文华 司鹏飞 田利勇 时方稳 YU Wen-hua;SI Peng-fei;TIAN Li-yong;SHI Fang-wen(Shanghai Water Engineering Design & Research Institute Co. Ltd., Shanghai 200061, China;Shanghai Water Authority Engineering Research Center on Flood Control and Disaster Reduction,Shanghai 200061, China)

机构地区：[1]上海市水利工程设计研究院有限公司,上海200061 [2]上海市水务局防汛减灾工程技术研究中心,上海200061

出　　处：《水道港口》2021年第6期770-774,782,共6页Journal of Waterway and Harbor

基　　金：上海市青年科技英才扬帆计划(20YF1443500)。

摘　　要：为探究板桩式高桩承台结构在软土地区船闸工程应用中的合理性,文章利用Plaxis有限元软件,模拟分析了上海市某船闸引航道高桩承台挡墙结构的受力变形特征以及桩侧土压力的分布情况,并与实际观测值进行了对比分析。结果表明,各排桩的水平位移极值从前至后逐渐增加;各排桩的弯矩值从前向后依次增加,且最大负弯矩出现的位置有逐渐升高的趋势。由于承台卸荷作用和后排桩的遮帘作用,第一排桩在开挖面以上承担的有效土压力值明显小于后几排桩。整体而言,板桩式高桩承台结构抵抗变形能力强,能有效地承担土水压力,在软土地区船闸引航道工程中适宜采用该结构型式。In order to verify the structure rationality of the elevated pile cap with sheet-piles in lock approach channel projects in soft soil area,the stress and deformation characteristics of the elevated pile cap as well as the distribution of earth pressure on pile foundations were analyzed in this paper by using Plaxis finite element method.The simulation results are in good agreement with the observed data.The results show that the maximum horizontal displacement of each row pile increases gradually from the front-row piles to the back-row piles.The bending moment of each row pile increases from front to back,and the position of the maximum negative bending moment tends to rise gradually in height.Due to the unloading effect of the cap and the curtain effect of the back row piles,the effective earth pressure on the first-row piles above the excavation surface is obviously smaller than that on the latter row piles.On the whole,the structure of the elevated pile cap with sheet piles can effectively resist deformation and bear soil-water pressure,which is suitable for the lock approach channel projects in soft soil area.

关 键 词：高桩承台 软土 内力 变形 有限元分析 

分 类 号：U655[交通运输工程—港口、海岸及近海工程]