砂土液化问题一直是土动力学与岩土地震工程研究领域的重要课题之一.基于南水北调中线一期工程总干渠漳河河漫滩段工程,通过现场和室内试验获取岩土体的动力学参数,利用岩土数值分析FLAC3D软件,砂土本构模型选为Finn模型,输入近场地邯郸台记录的实际地震波,对渠基砂土地震液化和渠道变形破坏特征进行了动力数值分析.结果表明,在地震作用下,超静孔隙水压力最大值位于渠堤底部砂土层中,但渠堤底部砂土层由于初始应力较大,其孔压比不高,不会发生液化;在渠道底部以及渠堤外侧坡面平台至坡脚局部区域土体虽然超孔隙水压力较小,但有效应力小,超孔压比反而大,砂土层发生了液化;在地震作用下变形主要发生在渠堤和浅层地基土里,具有对称性;渠堤边坡的变形破坏主要表现为在渠堤顶面发生震陷和拉裂破坏,在坡脚处发生水平侧向流动和挤压隆起变形.计算过程中,在渠堤及地基的不同位置设置监测点,得到了地震作用过程中不同位置处超孔隙水压力、有效应力和位移的动态变化规律.通过剪应变增量判断,在地震力作用下渠堤及地基中形成了贯通的剪切滑动面,易发生整体滑动破坏.研究成果对南水北调砂土液化特性的认识和防治有一定的意义. Sand liquefaction has always been one of the most important topics in the field of soil dynamics and geotechnical engineering.According to the Zhanghe floodplain project in the first phase of the Middle Route of the South-to-North Water Diversion Project, the dynamic parameters of rock and soil were obtained through field and laboratory tests, Using the numerical simulation software FLAC3D, the constitutive model of sand was chosen as the Finn model, and the actual seismic waves recorded by Handan station in the near field were input to simulate the dynamic liquefaction and channel deformation and failure of channel foundation sand. Under the action of an earthquake, the maximum pore water pressure is located in the sand layer at the bottom of the canal bank. However, due to the large initial stress, the pore water pressure at the bottom of the canal bank is not high and the liquefaction does not occur. Although the excess pore water pressure is small, the effective stress is small and the pore water pressure ratio is rather large, and the sand layer is liquefied. The deformation occurs mainly in the bank of the dike under the earthquake In the shallow foundation soil, the symmetry is found. The deformation and failure of the dyke slope are mainly caused by the subsidence and fracture of the top of the dyke, horizontal lateral flow and crustal uplift at the foot of the ditch In the process of calculation, the monitoring points are set up at different positions of the bank and the foundation, and the dynamic changes of excess pore water pressure, effective stress and displacement at different positions during the earthquake action are obtained. Judging by the shear strain increment, Under the action of the dike and the foundation, a through shearing sliding surface is formed, and the whole sliding failure is easy to occur.The research results are of certain significance to the understanding and prevention and cure of the liquefaction characteristics of the sand soil in the South-to-North Water Diversion Project.