Coupled DEM-FDM analyses of the effects of falling rock’s shape and impact angle on response of granular cushion and rock shed  

作　　者：Jingyu Xue Chen Cao Jianhua Yan Yaopeng Ji Jianping Chen 

机构地区：[1]College of Construction Engineering,Jilin University,Changchun,130026,China [2]School of Earth Sciences and Engineering,Hohai University,Nanjing,210098,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2024年第8期3353-3364,共12页岩石力学与岩土工程学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41941017 and U1702241).

摘　　要：Rock shed is an effective protection measure against rockfall.To investigate the influences of falling rock’s shape and impact angle on the impact effect of the cushioned rock shed,a modeling approach for a rock shed with a cushion layer using PFC-FLAC.The granular cushion is modeled as an aggregate of discrete non-cohesion particles,while the concrete plate and the beam are modeled as zones.The falling rock with different sphericities and impact angles is modeled as a rigid assembly.The numerical model is validated by comparing the simulation results with experimental and numerical results from previous literature.This model is applied to analyze the effects of rock shape and impact angle on the dynamic interaction effects between falling rock and cushioned rock shed,including the impact force,transmitted bottom force,penetration depth,and plate deflection.The numerical results show that the variation in the falling rock’s shape has different effects on the falling rock with different impact angles.These findings could support rock shed design by revealing the limitations of the assumptions in the past research,which may result in unsafe rock sheds for some rockfall cases.

关 键 词：Rockfall Coupled DEM-FDM analysis Rock’s shape Impact angle Granular cushion Rock shed 

分 类 号：TU91[建筑科学—建筑理论]