加筋堆石料的动力残余变形特性

Analysis of dynamic residual deformation characteristics of reinforced rockfill

基于堆石料动力大三轴试验结果,分析研究了加筋前后堆石料残余变形的变化规律。结果表明:随着振次的增加,加筋作用开始体现,加筋前后堆石料残余变形差值越来越大;堆石料残余变形随围压和动应力比的增大而增大;加筋3层的加固效果要好于加筋1层,但随着加筋层数的增加,堆石料残余变形减小幅度将逐渐降低;筋材网孔大小对加筋堆石料残余变形的影响较小。此外,构造了指数型经验式,较好地模拟了加筋堆石料残余剪切应变与振次的关系。

Based on the dynamic triaxial testing results of the rockfill materials,studies of the variation law of residual deformation of the rockfill materials before and after reinforcement are carried out in the paper.The analysis results show that with the increase of vibration times,the role of reinforcement is beginning to manifest,and the differences between the residual deformation of the rockfill materials before and after reinforcement are increasing.The residual deformation of the rockfill materials increases with the increase of the confining pressure and the dynamic stress ratio.The reinforcing effects of the three-layer reinforcement are better than those of the one-layer reinforcement,but with the increase of the reinforcement layer,the decrease range of the residual deformation of the rockfill materials will gradually decrease.The size of the reinforcement mesh has little influence on the residual deformation of the reinforced rockfill materials.In addition,an exponential empirical formula developed in this study can well simulate the relationships between the residual shear strains and vibration frequency of the reinforced rockfill materials.