饱和软黏土中不同形状深水防沉板基础承载特性研究  

Bearing capacity of different shape mudmat foundations for subsea production system on undrained clays

作　　者：刘润[1] 刘孟孟[1] 杨树耕[1] 

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072

出　　处：《海洋学报》2016年第3期131-144,共14页

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)

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。As the permanent support seabed structures for subsea wells,pipeline manifolds and pipeline terminations,the mudmat foundations have obviously complex,nonlinear and uncertain loading,which makes the research of mudmat foundationsstability a big challenge.In this paper,the bearing capacity of mudmat foundations in rectangular,square,hexagon and circle are researched under the same steel quantity condition on the deep clay where the strength increases linearly with depth.Numerical simulation method is utilized to investigate the failure envelops and formulas of mudmat are established in V-H 、V-M 、V-T、Hx-Hy、Mx-My、T-H T-Mload space,when combined vertical load V,Horizontal load H,moment load M,and torque load T were applied Analysis results show that the shape of mudmat has great influence on its bearing capacity.Concretely,the circular mudmat is suitable on the condition of large Vload,while the rectangular and square mudmat is better when the His obvious among all the loads.When Mis the control load,different shapes of the mudmat meet different conditions separately.But the rectangular or the square mudmat is optimal and the hexagon or the circle mudmat take second place when the influence of Tload cannot be ignored.

关 键 词：水下生产系统 防沉板基础 基础形状 复合加载 承载力包络线 

分 类 号：TU44[建筑科学—岩土工程]