层状地基中自升式钻井平台插桩穿刺风险分析  

Risk analysis of punch through for a jack-up drilling unit in layered soil

作　　者：林一 胡安康[1,2] 蒋玮[1,2] 王艺陶[2] 

机构地区：[1]中集船舶海洋工程设计研究院,上海201206 [2]哈尔滨工程大学船舶工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2016年第6期754-761,共8页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(51079034)

摘　　要：自升式钻井平台进行海上插桩作业,遭遇上硬下软的层状地基时极易发生穿刺海损事故,从而造成严重的结构破坏和人员伤亡。这种层状地基存在2种典型情况——硬粘土/软粘土层、砂土/粘土层。本文考虑土层参数的影响,基于非线性数值方法对其地基承载力的变化规律进行了研究。以某400英尺工作水深的自升式钻井平台为例,采用Monte-Carlo法,考虑预压载荷和土层参数的概率分布,对其在墨西哥湾某海域进行预压载作业时发生穿刺海损的风险进行了分析,结果表明其风险值小于10%,为此类平台进行相关作业的风险管理提供参考。When jack?up drilling units are in a preloading condition, it is possible to cause punch?through incidents in layered soils in which there is a stiff layer overlying a weaker layer. This may result in serious structure damage and casualties. Such layered soils are typically of two types?stiff clay/soft clay and stiff sand/soft clay. Taking into account the influence of the soil layer parameters, we used a non?linear numerical method to investigate the change law of the bearing capacity of soil. On this basis, taking a 400?ft jackup drilling unit as an example, we used the Monte?Carlo method, preloading probability distribution, and soil parameters to analyze the risk of punch?through in the Gulf of Mexico.The analysis results show that the risk value is below 10%, Our conclusions can provide a ref?erence for the risk management of similar jackup operations.

关 键 词：自升式平台 插桩穿刺 层状地基 风险分析 

分 类 号：U661.43[交通运输工程—船舶及航道工程]