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评价海床稳定性是海工建筑物设计所考虑的重要部分。基于经典弹性理论,采用半逆解法,推导了线性波浪荷载下成层弹性海床的总应力解答,在此基础上根据莫尔库仑破坏准则进行了海床剪切破坏分析,分析表明:随海床深度线性增加的土体剪切模量对应力角分布具有明显影响,特别是当海床厚度小于半倍波长时,最容易发生破坏的位置位于海床表面以下一定深度,而对于均质海床,最容易发生破坏的位置位于海床表面。软弱夹层对海床的稳定性存在影响,埋深越浅的软弱夹层越容易导致其上部土层的剪切破坏。
Assessing the stability of the seabed is an important part of the design of offshore structures. Based on the classical elastic theory, the semi-inverse solution method is used to derive the total stress response of the layered elastic sea bed under linear wave loading. Based on this, the shear failure analysis of the sea floor is carried out based on the Mohr-Coulomb failure criterion. The shear modulus of soil with linear increase of bed depth has a significant influence on the stress angle distribution. Especially when the thickness of the sea bed is less than half the wavelength, the most prone to damage is located at a certain depth below the surface of the sea bed, Bed, the most prone to damage is located on the surface of the sea bed. The influence of weak interlayer on the stability of the sea bed, the more shallow buried shallow interlayer can more easily lead to the shear failure of the upper soil layer.