西北水电Issue(4)：71-79,107,10.DOI:10.3969/j.issn.1006-2610.2026.04.010
不良级配对覆盖层砂砾石材料力学特性的影响
Influence of Poor Gradation on Mechanical Properties of Overburden Gravel Materials
摘要
Abstract
Particle gradation serves as a core factor affecting the mechanical properties of overburden dam foundations.To explore the deterioration law of gravel material performance induced by poor gradation and tackle the challenges in mechanical evaluation and de-sign of concrete face rockfill dam foundations,in-situ overburden gravels from a concrete face rockfill dam were adopted as test materi-als.Specimens were prepared via the mixed scaling method,and comparative tests with three gradations and four confining pressures were carried out by means of a large-scale triaxial shear apparatus.The deformation,strength and particle breakage characteristics of the materials were analyzed emphatically.The results show that compared with well-graded materials,poor gradation obviously reduces the peak shear strength and weakens the dilatancy of gravels;both cohesion and internal friction angle are remarkably lower than those of well-graded materials.Meanwhile,the particle breakage effect of poorly graded materials is more prominent.During shearing,the quantity of fractured particles increases greatly and particle size decreases evidently.This study reveals the correlation among grada-tion,particle breakage and mechanical indexes.The research results can provide references for the design of overburden foundations of concrete face rockfill dams,treatment of poorly graded dam foundations and stability checking,and have practical value for improving the construction quality of dam foundations in hydraulic engineering.关键词
覆盖层砂砾石/不良级配/三轴剪切试验/力学特性/颗粒破碎Key words
overburden gravel/poor gradation/triaxial shear test/mechanical properties/particle breakage分类
建筑与水利引用本文复制引用
汤轩林,温立峰,杨文勇,田波,李欢..不良级配对覆盖层砂砾石材料力学特性的影响[J].西北水电,2026,(4):71-79,107,10.基金项目
国家自然科学基金项目(52479132) （52479132）
陕西青年科技新星项目(2025ZC-KJXX-34) （2025ZC-KJXX-34）
