摘要
针对砂土-钢板接触界面,通过大型界面剪切试验和PFC细观模拟,探究法向应力和界面粗糙度对砂土-钢板接触界面剪切力学特性的影响及内在机理。结果表明:界面粗糙度增大,界面摩擦角随之增大,界面剪切强度、残余强度提高,砂土剪缩、剪胀性显著;法向应力增大,界面剪切强度、残余强度提高,砂土剪缩性提升,剪胀性降低;界面剪切过程中砂土颗粒向剪切方向移动聚集,强接触力链合并,数量减少,传力性能提升;界面粗糙度通过改变钢板槽内砂土颗粒的数量使其与钢板的接触面积发生变化,从而对界面剪切力学特性产生影响;法向应力影响砂土与钢板接触的密实度和作用力,使得其界面剪切力学性状产生变化。
This study investigates the influence of normal stress and interfacial roughness on the shear mechanical properties of sand-steel plate contact interface and explores the underlying mechanisms through large-scale interface shear tests and PFC mesoscopic simulations.The findings indicate that increased interfacial roughness leads to a higher interfacial friction angle,enhanced interfacial shear strength and residual strength,and more pronounced shear shrinkage and dilatancy of the sand.As normal stress increases,interfacial shear strength and residual strength improve,shear shrinkage of the sand increases,and dilatancy decreases.During the shear process,sand particles move and aggregate in the shear direction,resulting in the merging of strong contact force chains,with a decrease in their numbers but improved force transmission performance.The interfacial roughness affects the contact area between sand particles and the steel plate by altering the number of sand particles in the steel plate grooves,thereby influencing the interface’s shear mechanical properties.Normal stress affects the compactness and contact force between sand and steel plate,leading to changes in the interface’s shear mechanical properties.
作者
李永辉
王海
牛恒宇
蒋晓天
LI Yong-hui;WANG Hai;NIU Heng-yu;JIANG Xiao-tian(College of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;Henan Rail Transit Research Institute Co.,Ltd.,Zhengzhou 450000,China;Shanghai Urban Construction MunicipalEngineering(Group)Co.,Ltd.,Shanghai 200065,China)
出处
《长江科学院院报》
北大核心
2025年第2期107-114,137,共9页
Journal of Changjiang River Scientific Research Institute
基金
河南省自然科学基金面上项目(222300420555)
河南省重点研发专项(231111322100)。
关键词
砂土-钢板接触界面
界面剪切试验
PFC
细观模拟
界面粗糙度
法向应力
sand-steel plate contact interface
interface shear test
PFC
mesoscopic simulation
interface roughness
normal stress
