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鉴于弹性本构模型的简便性,目前波浪作用下海床瞬态剪切破坏深度的计算一般都是基于海床的多孔弹性介质模型,这种方法不能考虑塑性单元不平衡应力的重分配,而如果将海床视为多孔理想弹塑性介质进行波浪作用下的瞬态响应分析,则可以克服上述缺陷。为此,以波浪作用下砂质、粉砂质海床瞬态响应模型为例,基于Mohr-Coulomb屈服准则,对不同海床计算参数条件下上述2种计算方法的结果进行了对比分析。结果表明,将海床视为多孔理想弹塑性介质时海床瞬态剪切破坏深度大于等于海床为多孔弹性介质时的计算结果;随着海床计算参数的变化,2种方法计算结果的变化趋势较为一致,且在砂质、粉砂质海床常见计算参数范围内,2种方法计算结果的差值在一个相对固定的范围内变化。
In view of the simplicity of the elastic constitutive model, the calculation of the transient shear failure depth of the sea floor under wave action is generally based on the porous elastic medium model of the sea floor. This method can not consider the redistribution of the unbalanced stress of the plastic unit. If Taking the seabed as a porous ideal elastic-plastic medium for transient response analysis under wave action can overcome the above defects. Based on Mohr-Coulomb yield criterion, the results of two kinds of calculation methods under different seafloor parameters are contrasted and analyzed, taking the transient response model of sandy and silty seabed as an example. The results show that when the seabed is regarded as a porous ideal elastic-plastic medium, the failure probability of transient shear failure of the sea bed is greater than or equal to that of the seabed as the porous elastic medium. With the variation of the seabed calculation parameters, the calculated results of the two methods The trend of change is consistent. In the common calculation parameters of sandy and silty seabed, the difference between the calculated results of two methods varies within a relatively fixed range.