摘要
为了研究高围压作用下堆石体中剪切带形成及相关细观结构演变,采用自编程序构造3种不同形状的可破碎颗粒簇,随机生成二维颗粒流试样,进行双轴压缩试验。结果表明,轴向应变为6%时,试样由体缩向体胀过渡;轴向应变达到10%以后,试样内部发生了结构性变化。试样中颗粒簇的旋转、移动、破碎以及孔隙率等细观结构演变能清晰反映试样中剪切带的形成过程;轴向应变达到10%以后,试样中旋转幅度大的颗粒簇、破碎严重的颗粒簇以及大孔隙率区域均呈非对称X形分布,且X形轮廓逐渐清晰。
In order to study the formation of shear zone and the evolution of mesostructures in rockfill under high confining pressure,we constructed three different shapes of broken particle clusters by using self-designed program,and randomly generated two-dimensional particle flow samples for biaxial compression test.Results show that when axial strain is 6%,the volume shrinkage of specimen changes to volume expansion;when axial strain reaches 10%,the structure changes in the sample.The formation of shear zone can be clearly reflected by the evolution of micro-structures such as rotation,movement,fragmentation and porosity of particle clusters in the sample;when axial strain reaches 10%,the particle clusters with large rotation amplitude and serious breakage and the region with large porosity both present asymmetric X-shaped distribution,and the X-shaped contour gradually becomes clear.
作者
吴相豪
梁冰寒
华香玉
WU Xiang-hao;LIANG Bing-han;HUA Xiang-yu(College of Ocean and Science Engineering, Shanghai Maritime University, Shanghai 201306, China)
出处
《长江科学院院报》
CSCD
北大核心
2022年第4期128-134,共7页
Journal of Changjiang River Scientific Research Institute
关键词
堆石体
高围压
颗粒流
剪切带
细观结构
rockfill
high confining pressure
particle flow
shear zone
mesostructure
