横观各向同性饱和两相介质波动问题的时域显式有限元方法

    Time-domain explicit finite element method for wave propagation of transversely isotropic fluid-saturated porous media

    • 摘要: 针对横观各向同性饱和两相介质的弹性波动问题,分别应用空间解耦技术和时域显式逐步积分计算格式完成对该问题的有限元空间离散和时间离散,建立了横观各向同性饱和两相介质波动问题计算分析的时域显式有限元方法。应用该方法进行了输入地震波作用下横观各向同性饱和两相介质动力反应的计算分析,并将计算结果与完全各向同性饱和两相介质的计算结果进行对比研究,并对各向异性系数取值对于横观各向同性饱和两相介质动力反应计算结果的影响进行了研究和讨论。计算结果表明,横观各向同性饱和两相介质与完全各向同性饱和两相介质的动力反应特性具有较为显著的差异,各向异性系数取值对于横观各向同性饱和两相介质动力反应计算结果具有较为重要的影响。本文的数值计算工作同时表明,本文建立的时域显式有限元方法是进行横观各向同性饱和两相介质动力反应计算分析的一种有效方法。

       

      Abstract: A time-domain explicit finite element method for the elastic wave propagation of transversely isotropic fluid-saturated porous media is put forward. The space decoupling technology is adopted for the space discretization and the time-domain explicit step-by-step calculating format for the time discretization. Using the method, the dynamic response of transversely isotropic fluid-saturated porous media is calculated and analyzed, and the calculated results are compared with those of isotropic fluid-saturated porous media. The effect of the value of anisotropic coefficient on the calculated results of the dynamic response of transversely isotropic fluid-saturated porous media is also studied. The calculated results show that the dynamic response of transversely isotropic fluid-saturated porous media has remarkable difference from that of isotropic fluid-saturated porous media, and the value of anisotropic coefficient has a significant effect on the calculated results of the dynamic response of transversely isotropic fluid-saturated porous media. Meanwhile, the present numerical calculation indicates that the time-domain explicit finite element method is effective for the calculation and analysis of the dynamic response of transversely isotropic fluid-saturated porous media.

       

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