整体卸荷式板桩挡土结构三维有限元数值模拟分析*

整体卸荷式板桩挡土结构是深厚软土地区高桩码头良好的接岸结构形式,采用有限元数值分析方法得到不同桩排距、后排桩间距和开挖深度条件下该类挡土结构前后排桩受力和变形特征并进行研究。结果表明,增加前后排桩间距可以减小桩基的水平变形,并使前后排桩的桩力分布更加合理;改变后排桩间距使前排桩水平和竖向位移均逐渐增大,前后排桩端部弯矩和剪力都增大;开挖深度的增加使结构水平位移增加。

Three-dimension finite element numerical analysis of sheet-pile retaining structures with rigid load-relieving component

The sheet-pile retaining structure with rigid load-relieving component is the good structural type of high-pile wharf in land-based connection in deep thick soft soil area. In order to reach the conclusion of the stress and deformation characteristics between before and after piles under the conditions of different piles row distance, back row pile spacing and excavation depth, and to do a deep study on the distribution of internal force before and after piles under the unloading cap, the results show that to increase the spacing between two rows of pile foundation can reduce the horizontal deformation, and the back-row pile stress distribution more reasonable; change the back pile spacing allows the front pile horizontal and vertical displacement are gradually increasing, and pile end bending moment and shear force are increased; the excavation depth increases the structural horizontal displacement increase.