海底管线埋设沟槽边坡稳定性分析

摘要

海底石油管线埋设已经成为海洋工程的重要组成部分，在埋设管线的过程中沟槽的稳定性和坡度选择直接影响到埋设工程的工作量。利用强度折减有限单元法对某海域海底管线埋设的沟槽进行了分析，通过计算不同坡脚时沟槽边坡的稳定性，选择了符合工程要求的最佳坡脚。同时比较了最大总位移和x方向最大位移作为边坡失稳判据的区别，结果证明用最大总位移作为判据判断海底沟槽边坡稳定性更直观。%To bury submarine petroleum pipeline has become one of important parts of marine engineering,the stability and gradient of trench affect the submarine pipeline burying quantities. One submarine pipeline trench was analyzed by using strength-reduction finite element method. The best base of slope that satisfies engineering requirement was chosen through the stability calculation of trenches with different bases of slope. At the same time, maximum displacement in total and maximum displacement in x direction are compared each other as slope destabilization criteria. The results prove that the criterion of maximum displacement in total is more obvious to evaluate the slope stability of submarine trench.