桩基码头岸坡位移的离心模型试验与有限元分析

以云南富宁港通用码头为例,考虑初次蓄-排水对应的两种特殊水位,基于离心模型试验和ANSYS有限元分析,对有桩岸坡结构位移特征和变形特征进行了对比分析,确定了岸坡上部填方土体的最大沉降量。研究结果表明:蓄水期,模型产生的局部裂缝明显,坡体最大水平位移位于土层顶面与挡土墙连接部位,最大值为0.3 mm,换算到原型为45 mm;坡底最后一排桩的桩顶水平位移最大,达到了0.18 mm,对应原型为27mm;排水条件下水位降低,坡体内部分孔隙水外渗,边坡土体容易产生拉裂缝;按完整连续介质进行有限元计算得到的岸坡位移小于模型试验的换算值,但位移分布规律与模型试验基本相同。

Centrifuge model test and finite element analysis on pile-structure wharf slope displacement

Taking an universal inland river port at Funing, Yunnan for example, and considering two special water levels under the initial storage and drainage conditions, we analyzed the displacement and deformation characteristics of pile-structure bank based on centrifuge model tests and ANSYS finite element analysis, and the maximum settlement of the filling soil at the upper slope was determined. The results showed that in the initial storage period, local crack appeared at the centrifuge model, the maximum horizontal displacement of 0.3 mm occurred at the conjunction part of the upper slope and retaining wall, corresponding to prototype size of 45 mm. The maximum pile-top horizontal displacement of 0.18 mm appeared at the last row piles, corresponding to 27 mm of prototype. Under the drainage conditions, the water level was lowered, seepage-outward of partial pore-water in the slope would induce tension crack of soil. The overall computed displacement of slope by finite element software was less than the converted value from model test, however their variation law was basically the same.