极端波浪条件下黏土质斜坡海床稳定性解析

发布时间：2018-06-24 15:46

本文选题：海底滑坡 + 斜坡稳定性　；参考：《海洋工程》2016年04期

【摘要】：海洋资源开发引起海底软黏土的结构性破坏,导致土体强度弱化,在百年一遇的极端波浪作用时极易发生斜坡海床的局部失稳甚至大范围海底滑坡,给海洋工程建设和正常运营带来严重影响。目前,主要采用极限平衡法评价这类海底斜坡,但该法只能给出近似解。基于极限分析上限方法,推导了极端波浪诱发的波压力对斜坡海床的做功功率,建立了外力功与内能耗散率平衡方程;利用最优化方法,结合数值积分和强度折减技术,求解了不同时刻的斜坡海床稳定性系数,并针对扰动后的斜坡海床开展了有限元解的对比验证。在此基础上,深入探讨了不同波浪参数(波长、波高和水深)和坡长小于一个波长等极端条件下的海底斜坡稳定性。
[Abstract]:The exploitation of marine resources leads to the structural failure of the soft clay in the seabed, resulting in the weakening of the strength of the soil, and the local instability of the slope seabed and even the large-scale submarine landslide are easy to occur when the extreme waves occur once in a hundred years. To the ocean engineering construction and the normal operation brings the serious influence. At present, the limit equilibrium method is mainly used to evaluate this kind of submarine slope, but the method can only give an approximate solution. Based on the upper limit method of limit analysis, the work power of wave pressure induced by extreme waves on the slope seabed is derived, the balance equation of external force work and internal energy dissipation rate is established, and the optimization method is used in combination of numerical integration and intensity reduction technique. The stability coefficient of slope seabed at different times is solved, and the finite element analysis is carried out for the disturbed slope seabed. On this basis, the stability of submarine slope with different wave parameters (wavelength, wave height and water depth) and slope length less than one wavelength is discussed.
【作者单位】：大连理工大学海岸和近海工程国家重点实验室;辽宁师范大学城市与环境学院;中国矿业大学深部岩土力学与地下工程国家重点实验室;国土资源部海洋油气资源与环境地质重点实验室;
【基金】：国家自然科学基金资助项目(51579032) 海洋油气资源与环境地质重点实验室基金资助项目(MRE201304) 深部岩土力学与地下工程国家重点实验室基金资助项目(SKLGDUEK1307)
【分类号】：P736;P75

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