The increase of pore water pressure under a dynamic load is an important reason for the vibration liquefaction of saturated sand. Therefore, studying the dynamic pore water pressure model of tailings sand plays an important role in the seismic liquefaction analysis of tailings ponds. In this paper, the dynamic pore water pressure development characteristics of tailings fine sand and tailings silt in a tailings pond with the centerline method are studied by dynamic triaxial tests. The research results show that the liquefaction dynamic pore pressure ratio of tailings fine sand shows a trend of "rising–smooth–rising" with increasing vibration frequency ratio, and the liquefaction dynamic pore-pressure ratio of tailings silt shows an approximate linear and stable increasing trend. According to the development law of dynamic pore pressure, a new tailings sand pore pressure stress model is proposed in this paper, and the fitting effect is compared with four different pore pressure models, which verifies the applicability of the new model to predict the growth of dynamic pore pressure in tailings and silt.

动荷载作用下孔隙水压力的增加是饱和砂振动液化的重要原因。因此，研究尾矿砂动孔隙水压力模型对尾矿库地震液化分析具有重要意义。本文采用中心线法，通过动三轴试验研究了尾矿库尾矿细砂和尾矿淤泥的动孔隙水压力发育特征。研究结果表明，尾矿细砂液化动孔压比随振动频率比的增加呈“上升-平稳-上升”趋势，尾矿粉土液化动孔压比呈近似线性且稳定增加的趋势。趋势。根据动孔隙水压力的发展规律，