人民长江2025，Vol.56Issue(6)：182-190,9.DOI:10.16232/j.cnki.1001-4179.2025.06.024
无胶结粗粒土初始结构对剪切带的影响
Effect of initial structure of uncemented coarse-grained soil on shear zone
摘要
Abstract
To investigate the influence of the initial structure of uncemented coarse-grained soil on shear zone,visual direct shear tests were conducted on coarse-grained soils with different initial structures.The variation characteristics of shear zone un-der different normal stresses were obtained,and the relationship between the initial structure of coarse-grained soil and the thick-ness of shear zone was determined.Image recognition methods were employed to extract quantitative indicators of the initial struc-ture,such as particle roundness,flatness,orientation angle,porosity,and coordination number.The gray correlation method was then used to analyze the contribution of each quantitative indicator to the shear zone thickness.The results show that the initial structure of uncemented coarse-grained soil directly affects the formation and development of shear zones.Among the factors,particle contact relationships dominate the influence on shear zone thickness,followed by particle shape and arrangement.As nor-mal stress increases,the influence of particle shape on shear zones becomes more pronounced.The irregular geometric characteris-tics of particles are amplified under stress,further affecting the morphology and evolution of shear zone.These findings provide val-uable insights for research on the initial structure of coarse-grained soil.关键词
粗粒土/初始结构/剪切带/量化指标/灰色关联度法Key words
coarse-grained soil/initial structure/shear zone/quantitative indicator/gray correlation degree分类
建筑与水利引用本文复制引用
魏龙,魏玉峰,康俊洋,张国奥,彭俊皓..无胶结粗粒土初始结构对剪切带的影响[J].人民长江,2025,56(6):182-190,9.基金项目
国家自然科学基金项目(42072303) （42072303）
