砂土-钢板界面剪切试验与PFC细观模拟分析  

Shear Test and PFC Meso-simulation Analysis of Sand-Steel Interface

作　　者：李永辉[1] 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)

机构地区：[1]郑州大学土木工程学院,郑州450001 [2]河南省轨道交通研究院有限公司,郑州450000 [3]上海城建市政工程(集团)有限公司,上海200065

出　　处：《长江科学院院报》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)。

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.

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 

分 类 号：TU411[建筑科学—岩土工程]