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计算坝体卸载及再加载时的变形在设计中是一个有待研究的重要问题。文中首先分析粗粒土卸载再加载条件下的强度－变形特性，进而讨论了卸载－再加载变形模量确定的常规方法和改进，并将拉德－邓肯模型修正后用于再加载应力－应变的弹塑性分析。结果表明，对卸载和再加载条件下变形的弹塑性分析，采用修正的拉德－邓肯模型是适宜的。
Calculation of dam unloading and reloading deformation in the design is an important issue to be studied. In this paper, the strength-deformation characteristics of coarse-grained soil under unloading and reloading are analyzed firstly, and then the conventional methods and improvements to determine the unloading-reloading deformation modulus are discussed. The modified Radon-Duncan model is used to reload the stress- Elastic-plastic analysis. The results show that the modified LAD-Duncan model is suitable for elasto-plastic analysis of deformation under unloading and reloading conditions.