局部加卸载下散粒体中接触力的残留特性及细观机理

基于光弹试验分析了正五棱柱颗粒体系在一个分级加卸载周期下力链和颗粒位移的演化过程.结果表明，强力链上的接触力和颗粒位移在卸载释放时均存在“残留”现象，卸载阶段颗粒位移正响应区域大于加载阶段.定义量纲一化的位移恢复率ηd(-1
A photoelastic experiment was conducted to analyze the evolution characteristics of force chain network and granule displacement in pentagons under a complete loading and unloading cycle. The results demonstrate that both contact force within the strong force chain and granule displacement show a visible “hysteresis” phenomenon during unloading; the area where granule displacement response is positive during unloading is larger than the area during loading. The displacement recovery ratio ηd((