深水喷射井口结构套管水平承载力

Lateral bearing capacity of jetting structural casing of wellhead in deepwater

提出了喷射结构套管管周扰动土体的抗剪强度增长规律的表达式,分析了扰动土体抗剪强度的增长对API建议的软粘土p-y曲线、管身土抗力和弯矩分布、管身挠曲变形及结构套管水平承载力的影响。研究结果表明:喷射后管周扰动土体的抗剪强度与时间对数近似呈线性关系;随着时间的增加,软粘土p-y曲线的极限土抗力和初始斜率逐渐增大,但增大的幅度逐渐减小;结构套管水平承载力也与其时间对数呈线性关系。

A shear strength formula of disturbed soil surrounding a jetted structural casing was presented and its increase law with set-up time increasing was estimated. Based on the shear strength formula, the influences of soil shear strength varying with time on API recommended soft clay p-y curves, soil resistance and moments along casing length, casing distortion and lateral bearing capacity were investigated. The results show that the disturbed soil shear strength increases linearly with logarithmic time increasing. The limiting lateral capacities and initial slopes of p-y curves increase with time increasing. The structural casing lateral bearing capacity and logarithmic time shows linear relation.