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地震土压力的计算一直是挡墙抗震设计的核心内容,目前一般采用MononobeOkabe理论进行拟静力计算得到。但是拟静力法的缺陷也十分明显,它没有考虑地震加速度时空分布的不均匀性和结构与填土的动力特性影响,因此,该文提出了考虑动力特性的挡墙地震土压力计算方法,除拟静力法中涉及到的墙背摩擦角、土体摩擦角等参数以外,此计算方法还考虑了土体粘聚力、墙体和填料的放大效应、地震剪切波和纵波的时程与相变效应等影响因素,并且可以直接得到地震时墙背土压力的非线性分布的解析解。较拟静力法,此方法更为完善,也更具合理性。
Earthquake pressure calculation has been the core of retaining wall seismic design, the current general use of MononobeOkabe theory quasi-static calculation. But the defect of quasi-static method is also very obvious. It does not consider the spatial and temporal distribution of seismic acceleration and the dynamic characteristics of the structure and filling, so this paper proposes a method to calculate the earth pressure of retaining wall considering the dynamic characteristics, In addition to parameters such as the friction angle of the back wall and the soil friction angle involved in the quasi-static method, the calculation method also considers the cohesion of the soil, the amplification effect of the wall and the packing, the shear wave and the longitudinal wave Process and phase transition effect and other factors, and can be directly obtained when the back wall earth pressure on the nonlinear analytical solution. More quasi-static method, this method is more perfect, but also more reasonable.