设计了一套利用单元填土模型试验确定累积变形状态阈值的方法。通过有限元计算确定主要受力区作为模型填土空间,以砖墙和砂袋组合形成模型填土非完全侧限边界约束,结合变形测试和循环加载设备构成试验系统。在填土空间内填筑相应压实状态的模型进行循环加载试验,获得累积变形随加载次数的变化曲线,运用“幂次判别法”确定循环荷载作用下累积变形演化状态阈值。选用级配碎石填料进行循环加载试验,验证了基于单元填土模型试验确定累积变形状态阈值的可行性。 A set of methods to determine the threshold of cumulative deformation by using the model test of cell fill is designed. Through the finite element calculation, the main stress area is selected as the model fill space, and the brick and sand bags are combined to form the non-fully confined boundary constraints of the model fill. The deformation test and cyclic loading equipment are used to form the test system. Fill the corresponding compaction state model into the fill space to carry out the cyclic loading test and obtain the curve of the cumulative deformation with the loading times, and use the power discriminant method to determine the cumulative deformation evolution threshold under the cyclic loading. The use of graded gravel packing for cyclic loading test verifies the feasibility of determining cumulative deformation threshold based on unit fill model tests.