饱和粘土中导管架平台单桩水平承载力分析

Analysis of the Horizontal Bearing Capacity of the Jacket Platform Single Pile in Saturated Clay

运用ABAQUS有限元分析软件,建立饱和粘土中单桩的桩土耦合模型,对现役导管架平台桩基在水平载荷下的承载问题进行了数值分析。分析结果表明,6倍桩径以上为桩的关键受力部位,平台设计时桩从泥面往下6倍桩径处必须加厚处理,保守设计为12倍桩径;最大土抗力出现在2.5倍桩径处,最大位移为土表面;水平载荷下桩土的承载部位主要集中在上部,土抗力出现最大值的位置比桩出现最大弯矩的位置要往上,并且土抗力不会随着深度的增加而无限增大。该项研究结果对平台的设计及现役导管架平台的评估有一定参考价值和指导作用。

Using the ABAQUS finite element analysis software, the pile-soil coupling model for single pile in saturated clay was established to conduct a numerical analysis of the bearing problem of the pile foundation of jacket platform with horizontal load in active service. The numerical analysis shows that the place of over 6 times the pile diameter is the key force zone of the pile. The place 6 times the pile diameter lower from mud surface must be thickened in platform design. The conservative design is 12 times the pile diameter （ with the maximum bending moment plane as symmetrical valuing） . The maximum soil resistance appears at the place 2. 5 times the pile diameter and the maximum displacement is soil surface. The bearing part of pile-soil mainly concentrates on the upper part under horizontal load. The place where there occurs the maximum value with soil resistance tends to be upper, compared with the place where there occurs the maximum bending moment with the pile. Moreover, soil resistance will not increase infinitely with the increase of depth. The research findings can serve as a reference and guide to platform design and assessment of in-service jacket platform.