摘要
为了提高自升式钻井平台穿刺分析的准确性,选取3个场址(2个渤海场址,命名为A场址和B场址;1个南海场址,命名为C场址),采用Baglioni分析法、3∶1穿刺分析法、冲剪系数分析法和地基压力扩散角法四种穿刺分析法对钻井平台基础进行了承载力分析及穿刺分析,结果表明:Baglioni分析法的分析结果基本可靠,但其对松散砂或密实砂的分析结果与实际结果有一定偏差;3∶1穿刺分析法的分析结果也基本可靠,但其等效基础未考虑砂层密实度的影响;冲剪系数分析法的分析结果存在较大不确定性,其冲剪系数的选取仍需继续优化;地基压力扩散角法的分析结果存在较大的局限性,该方法对钻井平台基础不适用。通过分析可得,对于一般常规场址,单一使用Baglioni分析法或3∶1穿刺分析法均可行,对于复杂的场址宜综合使用多种方法进行分析评价等。结论可为工程地质工程师进行穿刺分析提供参考。
In order to improve the accuracy of the punch-through analysis in footing penetration of jack-up rig,3 sites named as Site A and Site B in the Bohai Sea and Site C in the South China Sea are selected and 4 punch-through analysis methods including Baglioni analysis method,3∶1 punch-through analysis method,punching shear coefficient method and foundation pressure expansion angle method are chosen for the bearing capacity and punch-through analyses of the drilling rig foundation.The analysis results show that the results from the Baglioni method are basically reliable,but there is a certain deviation between the actual results and the results from the analysis of loose sand or dense sand;the results from the 3∶1 method are also basically reliable,but the influence of sand layer density is not considered for its equivalent foundation;for the results from the punching shear coefficient method,greater uncertainty is present and the coefficient needs to be optimized further;and the results from the foundation pressure expansion angle method have greater limitations,indicating that this method could not be applicable for the analysis of the foundation of jack-up rig.It is therefore concluded that either the Baglioni method or the 3∶1 method can be used alone at general sites.For complicated sites,multiple methods should be comprehensively used for the analysis and evaluation.This study can provide a reference for geotechnical engineers to carry out punch-through analysis.
作者
佘稳
蔡龙龙
刘剑涛
SHE Wen;CAI Long-long;LIU Jian-tao(China Oilfield Services Limited, Tianjin 300459, China)
出处
《海岸工程》
2021年第3期214-225,共12页
Coastal Engineering
关键词
穿刺
扩散角
内摩擦角
冲剪
安全系数
punch-through
expansion angle
internal friction angle
punching shear
safety factor
