砂土中桩靴插桩对临近筒型基础的影响研究

STUDY ON INFLUENCE OF SPUDCAN PENETRATION PILE ON ADJACENT BUCKET FOUNDATION IN SANDY SOIL

通过物理模型试验和有限元法研究砂土中风电安装船桩靴插桩对临近筒型基础的影响。首先通过物理模型试验,验证有限元模型的合理性,初步确定桩靴在砂土中贯入的影响范围大致在2.5倍桩靴直径。基于有限元CEL方法进一步研究桩靴和筒型基础的净距与桩靴直径之比(S/D)对筒型基础在位稳定性的影响。结果表明:筒型基础的倾斜率、最大竖向位移以及筒壁应力随着S/D的增大而逐渐减小,插桩过程中,靠近桩靴一侧的筒裙和分舱板应力远大于远离桩靴一侧的筒型基础应力,且筒顶的土压力远小于筒底土压力。

The influence of spudcan penetration of wind turbine installation vessel in sandy soil on adjacent bucket foundation was investigated by physical model tests and finite element method.Firstly,the physical model tests were conducted to verify the rationality of the finite element model,and it was preliminarily determined that the influence area of spudcan penetration in sandy soil was roughly 2.5 times the diameter of the spudcan.Based on the finite element CEL method,the influence of the ratio of the distance between the spudcan and the bucket foundation to the diameter of the spudcan(S/D)on the in-situ stability of the bucket foundation is further studied.The results show that the inclination rate,the maximum vertical displacement and the stress on the bucket wall of the bucket foundation gradually decrease with the increase of S/D.During the spudcan penetration process,the stress on the bucket skirt and the compartment plate at the side near the spudcan is much greater than that at the side away from the spudcan,and the earth pressure at the top of the bucket foundation is much smaller than that at the bottom of the bucket foundation.