岩土力学2024，Vol.45Issue(5)：1378-1387,10.DOI:10.16285/j.rsm.2023.0772
考虑微裂纹随机分布的堆石颗粒准静态强度统计模型
Statistical model for quasi-static strength of rockfill particles considering random distribution of microcracks
摘要
Abstract
The material strength is directly affected by the random distribution of the size,shape,orientation and spatial location of internal microcracks.This study aims to investigate the statistical relationship of the strength of rockfill particles with respect to size and strain rate under quasi-static condition.The assumption is made both the size and spatial location of microcracks followed the power-law distribution.A rational link is established between the compound parameters,which consist of the cumulative damage probability and volume of the particles and the crushing strength within the framework of the weakest chain theory.From a microscopic perspective,the strength of microcracks in particles increases with the strain rate.The effect of strain rate leads to a reduction in the failure probability per unit volume.Simultaneously,the spatial location distribution of microcracks becomes sparse,and the size effect on particle strength weakens.The results of the single particle crushing tests show that as the loading rate increases,there exists a gradually decreasing power index of spatial location distribution,which allows the particle compound parameters to converge on the master curve determined by the weakest chain statistical model.关键词
颗粒强度/尺寸效应/应变率效应/统计模型Key words
particle strength/size effect/strain rate effect/statistical model分类
建筑与水利引用本文复制引用
闫世豪,迟世春,王晋伟,郭宇,周新杰..考虑微裂纹随机分布的堆石颗粒准静态强度统计模型[J].岩土力学,2024,45(5):1378-1387,10.基金项目
国家重点研发计划(No.2016YFB0201001).This work was supported by the National Key Research and Development Program of China(2016YFB0201001). （No.2016YFB0201001）
