【摘要】 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。更多还原

【Abstract】 The calculation of high earth dam deformation during reservoir falling and then refilling is an im-portant problem in engineering design. In this paper,the authors have analyzed the deformation characteristicsof coarse grain soil under unloading and reloading,discussed the common method of deformatiOn modulus,andproposed a new method used for elasto-plastic analysis of stress-strain of coarse grain soil under reloading andunloading.更多还原