霍沿东, 年廷凯, 焦厚滨, 郑德凤, 印萍. 2019: 基于极限分析上限方法的海底斜坡地震稳定性. 工程地质学报, 27(2): 408-414. DOI: 10.13544/j.cnki.jeg.2017-621
    引用本文: 霍沿东, 年廷凯, 焦厚滨, 郑德凤, 印萍. 2019: 基于极限分析上限方法的海底斜坡地震稳定性. 工程地质学报, 27(2): 408-414. DOI: 10.13544/j.cnki.jeg.2017-621
    HUO Yandong, NIAN Tingkai, JIAO Houbin, ZHENG Defeng, YIN Ping. 2019: SEISMIC STABILITY OF SUBMARINE CLAY SLOPES BASED ON UPPER BOUND APPROACH. JOURNAL OF ENGINEERING GEOLOGY, 27(2): 408-414. DOI: 10.13544/j.cnki.jeg.2017-621
    Citation: HUO Yandong, NIAN Tingkai, JIAO Houbin, ZHENG Defeng, YIN Ping. 2019: SEISMIC STABILITY OF SUBMARINE CLAY SLOPES BASED ON UPPER BOUND APPROACH. JOURNAL OF ENGINEERING GEOLOGY, 27(2): 408-414. DOI: 10.13544/j.cnki.jeg.2017-621

    基于极限分析上限方法的海底斜坡地震稳定性

    SEISMIC STABILITY OF SUBMARINE CLAY SLOPES BASED ON UPPER BOUND APPROACH

    • 摘要: 极限分析上限方法在海底斜坡稳定性评价中受到了广泛关注,但已有成果未考虑地震荷载以及多土层海底斜坡可能出现的局部破坏机制。基于上限定理,推导了拟静力水平地震条件下多土层海底斜坡外力功率与内能耗散率平衡方程;结合强度折减技术和最优化方法,求解了海底斜坡整体和局部地震稳定性安全系数,并实现了多土层海底斜坡的局部滑动面搜索;通过典型算例分析,验证了本文方法的有效性。在此基础上,探讨了不同水平地震条件下两种组合土层海底斜坡的整体和局部稳定性,通过与数值解对比,其结果可以较准确地评价海底斜坡稳定性并有效预测滑移面位置。最后,将极限分析上限方法应用于一海底斜坡工程实例。

       

      Abstract: The upper bound method of limit analysis has received extensive attention in the stability assessment of submarine slopes. However, the method has not take into account the seismic load and the possible local failure mechanism of multi-layered submarine slopes. Based on the upper bound theorem, we derive the equilibrium equation of power dissipation and internal energy dissipation rate of multi-layered submarine slopes under horizontal pseudo-static earthquake load. Combined with the strength reduction technique and the optimization method, we solve the global and local factors of safety of submarine slopes under different horizontal seismic coefficients, and successfully search the local sliding surfaces of multi-layered submarine slope. The analyses of typical examples verify the effectiveness of the proposed method. On this basis, we discuss the global and local stability of submarine slopes with two typical combined soil layers under different earthquake conditions. By comparing with the numerical solution, we can accurately evaluate the stability of submarine slopes and effectively predict the position of critical slip surfaces. Finally, the improved method is applied to one case of submarine slope.

       

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