水力发电学报2025，Vol.44Issue(7)：97-108,12.DOI:10.11660/slfdxb.20250708
颗粒形态对间断级配砂砾土内部侵蚀影响研究
Study on impact of particle morphology on internal erosion in gap-graded sand and gravel soils
摘要
Abstract
For gap-graded sand and gravel soils under seepage flow,internal erosion is caused by fine particles migrating through void channels between coarse particles.The migration leads to the redistribution and deformation of the soil skeleton,thereby threatening the safety and stability of earth and rock dams,dykes and so on.Particle morphology along with its correlation with other parameters is one of the most important influences on internal erosion to soil structures.In this study,a custom-developed soil internal erosion set-up is used to conduct experimental tests on three types of gap-graded sand and gravel soils with varying particle morphologies under different hydraulic gradients,focusing on the macroscopic evolution characteristics of soil internal erosion.Using the computational fluid dynamics-discrete element method(CFD-DEM)coupling approach,we consider coarse particle morphology with different sphericity and fine particle content to examine their combined effects on internal erosion from the perspectives of force chains,contact forces,and coordination numbers.The findings indicate that with a fixed content of fine particles in the soil,the higher the sphericity of its coarse particles,the more significant is the number and magnitude of its fine particles that are lost due to internal erosion.The self-locking effect of non-spherical particles enhances its resistance to seepage failure.Additionally,the sphericity of coarse particles is inversely related to the average coordination number.These findings lay a basis for assessing the internal erosion risk of gap-graded sand and gravel soils.关键词
间断级配砂砾土/内部侵蚀/颗粒形态/CFD-DEM/细颗粒流失Key words
gap-graded sand and gravel soil/internal erosion/particle morphology/CFD-DEM/loss of fine grain分类
建筑与水利引用本文复制引用
许增光,武子豪,曹成,柴军瑞..颗粒形态对间断级配砂砾土内部侵蚀影响研究[J].水力发电学报,2025,44(7):97-108,12.基金项目
国家自然科学基金(52179143 （）
52209167) （）
陕西省科技创新团队(2022TD-01) （2022TD-01）
