饱和软黏土中不同形状深水防沉板基础承载特性研究

发布时间：2018-06-07 14:38

本文选题：水下生产系统 + 防沉板基础　；参考：《海洋学报》2016年03期

【摘要】：防沉板基础是水下井口、管汇节点与管汇终端等的永久支撑结构,其承受的荷载具有明显的复杂性、非线性和不确定性,给防沉板基础的稳定性研究带来了巨大挑战。本文研究了在剪切强度随深度线性增长的不排水饱和软黏土中,相同用钢量条件下矩形、方形、六边形和圆形防沉板基础的承载特性。采用数值模拟方法确定了竖向荷载V、水平向荷载H(Hx、Hy)、弯矩荷载M(Mx、My)和扭矩荷载T联合作用下,防沉板基础在V-H、V-M、V-T、Hx-Hy、Mx-My、T-H和T-M荷载空间的地基承载力包络线,并建立了相应的拟合公式。研究表明,不同的基础形状对其承载力影响显著,当V较大时,适宜选用圆形基础;当H较为显著时,应选用矩形或方形基础;圆形、方形和矩形基础的抗弯特性分别适用于不同条件下M为主控荷载的情况;当T的影响不可忽视时,矩形或方形基础为首选形式,六边形和圆形基础次之。
[Abstract]:Anti-sinking plate foundation is a permanent bracing structure of underwater wellhead, tube-sink joint and terminal, etc. The load it bears has obvious complexity, nonlinearity and uncertainty, which brings great challenge to the stability research of anti-sinking plate foundation. In this paper, the bearing characteristics of rectangular, square, hexagonal and circular anti-settlement plate foundations in undrained saturated soft clay with linear shear strength increasing with depth are studied under the same steel content. Under the combined action of vertical load, horizontal load, moment load, and torque load T, the envelope of foundation bearing capacity of anti-settlement slab foundation in V-H _ (V) V-M _ (V) -H _ (x) -H _ (x) -My-T _ H and T-M load space is determined by numerical simulation method, and the corresponding fitting formula is established. The results show that different foundation shapes have significant influence on the bearing capacity. When V is larger, circular foundation should be chosen. When H is more prominent, rectangular or square foundation should be chosen. The bending characteristics of square foundation and rectangular foundation are suitable for the case where M is the main control load under different conditions. When the influence of T can not be ignored, the rectangular or square foundation is the preferred form, and the hexagonal and circular foundation is the second.
【作者单位】：天津大学水利工程仿真与安全国家重点实验室;
【基金】：国家重点基础研究发展计划(973计划)(2014CB046802) 国家自然科学基金优秀青年基金(51322904) 天津市自然科学基金面上项目(12JCYBJC4700)
【分类号】：TU470;P754

【参考文献】