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为研究颗粒粒径对粗粒土与混凝土结构接触面剪切力学特性的影响,进行3不同粒径范围(2.36 ～4.75mm、4.75～9.5mm、13.6～16mm)均匀粒径组粗粒土与两种不同混凝土接触面(光滑和粗糙)大型直剪试验,研究粗粒土粒径对接触面剪切强度的影响规律.试验结果表明:随粒径的增大接触面剪切应力-剪切位移曲线从剪切软化型逐渐向剪切硬化型发展.光滑接触面剪切强度随粗粒土平均粒径的增大几乎呈线性增大;而粗糙接触面剪切强度在平均粒径达到7.13mm后,其增大速率逐渐交小.相同法向应力下粗糙接触面剪切强度明显高于光滑接触面.摩尔库伦强度指标分析表明:粒径的增大显著提高了接触面的表观黏聚力;但对接触面内摩擦角的影响不明显.“,”A series of large direct shear tests were performed to study effects of particle size on shear behavior of coarse-grained soil-concrete interface,three types of uniformly coarse-grained soil (2.36 ～4.75mm、4.75 ～ 9.5mm、13.6 ～ 16mm) and two different concrete surface (smooth and rough) were used in this study.The results show that the shear stress-shear displacement curves of interface develop from strain softening to strain hardening with increasing particle size.The shear strength of smooth interface increases almost linearly with mean particle size of coarse-grained soil;The rate of increase in shear strength of rough interface diminishes when mean particle size of coarse-grained soil is greater than 7.18am.The shear strength of rough interface is significantly larger than that of smooth interface under a specific normal stress.The increasing particle size can remarkably increase the apparent cohesion of interface,but has little influence on internal friction angle of interface.