深水港码头围堤和群桩结构的离心模型试验

Centrifuge modeling of sea dike and pile groups in a habour

沿海围堤及群桩结构在码头工程建设中得到广泛应用。本项深水港码头离心模拟试验研究 ,按照离心模型相似率的原则模拟了原型地层、人工围堤、袋装砂井、大直径长钢管桩桩群以及码头承台和使用荷载 ,针对不同的施工过程和运行阶段 ,分级进行离心模拟试验。试验给出围堤及码头在施工期和运行期的变形过程 ,同时给出部分钢管桩受围堤及地基变形影响产生的水平位移、弯矩和土抗力的变化曲线。由于在离心模型中可以模拟原型土与结构之间相互作用的复杂应力状态 ,可以考虑桩的三维效应以及软土地层在荷载作用下的长期固结过程 ,因此试验结果可以较为直观地给出原型结构物的变形过程和特点 。

Centrifuge model tests were carried out for a pier constructed on a deep soft ground with a combination of long pipe piles, dikes, soil foundation and other associated structures. This paper presents the test results of the deformation of the dike, the bending moment and soil resistance of the pile near the dike at different construction and operation periods. Since the 3-D effect of pile groups and the consolidation processes of the soft foundation can be simulated in the centrifuge modeling at the same time, the test results offer an economical and effective alternative to large scale field tests in verifying the numerical analysis and determining the behavior of pile groups.