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本文将地震产生的振动孔隙水压力与土坝和地基的变形和固结紧密结合起来,将振动孔隙水压力引入著名的皮奥(Biot)方程式中,用等参数有限单元法联立求解位移和残余孔隙水压力;提出了一种适用于土坝和地基动力分析的非线性二维有效应力分析方法.采用该法,不仅可以计算地震动应力、动应变、加速度,而且可以计算地震期和地震结束后的孔隙水压力增长、扩散、消散、液化的发生发展过程、土的残余体积变形及其随着时间的变化.文中以加权剩余值法为基础,进行了详细的有限单元法分析与公式推导.作为算例,文末给出了在地震作用下辽宁盖县石门土坝的计算结果.
In this paper, the vibration pore water pressure generated by earthquake is closely combined with the deformation and consolidation of earth dams and foundations. The vibration pore water pressure is introduced into the famous Biot equation, and the displacement and sum are solved using the finite element method with equal parameters. Residual pore water pressure; a non-linear two-dimensional effective stress analysis method for dynamic analysis of earth dams and foundations is proposed. Using this method, not only ground motion stress, dynamic strain, acceleration can be calculated, but also earthquake period and earthquake can be calculated. After the completion of the pore water pressure growth, diffusion, dissipation, liquefaction occurred in the process of development, the residual volume deformation of soil and its changes over time. Based on the weighted residual method, the detailed finite element analysis and formula As an example, at the end of the paper, the calculation results of the Shimen earthen dam in Gai County, Liaoning Province under earthquake are given.