Protective effects of baffles with different positions,row spacings,heights on debris flow impact  

作　　者：SUN Xinpo CHEN Min BI Yuzhang ZHENG Lu CHE Chi XU Ao TIAN Zijian JIANG Zheyuan 

机构地区：[1]College of Civil Engineering,Sichuan University of Science and Engineering,Zigong 643000,China [2]College of Resources and Environment,Fujian Agriculture and Forestry University,Fuzhou 350002,China [3]School of Civil Engineering,Fuzhou University,Fuzhou 350108,China [4]Jiangsu Key Laboratory of Urban Underground Engineering&Environmental Safety,Institute of Geotechnical Engineering,Southeast University,Nanjing 210096,China [5]Beijing Urban Construction Science Technology Promoting Association,Beijing 100055,China [6]SUSE-BZ Geoenvironmental Engineering Joint Laboratory,Sichuan University of Science and Engineering,Zigong 643000,China

出　　处：《Journal of Mountain Science》2024年第7期2352-2367,共16页山地科学学报（英文）

基　　金：provided by the National Natural Science Foundation of China(Grant No.41977233);the key projects of the Science and Technology Department of Sichuan Province(Grant No.2020YJ0360);Sichuan Education and Teaching Reform project(Grant No.JG2021-1069);the opening project of Sichuan province university key Laboratory(Grant No.SC_FQWLY-2020-Z-02)。

摘　　要：The baffle effectively slowed down debris flow velocity,reduced its kinetic energy,and significantly shortened the distance of debris flow movement.Consequently,they are widely used for protection against natural hazards such as landslides and mudslides.This study,based on the threedimensional DEM(Discrete Element Method),investigated the impact of different baffle positions on debris flow protection.Debris flow velocity and kinetic energy variations were studied through single-factor experiments.Suitable baffle positions were preliminarily selected by analyzing the influence of the first-row baffle position on the impact force and accumulation mass of debris flow.Subsequently,based on the selected baffle positions and four factors influencing the effectiveness of baffle protection(baffle position(P),baffle height(h),row spacing(S_(r)),and angle of transit area(α)),an orthogonal design was employed to further explore the optimal arrangement of baffles.The research results indicate that the use of a baffle structure could effectively slow down the motion velocity of debris flows and dissipate their energy.When the baffle is placed in the transit area,the impact force on the first-row baffle is greater than that when the baffle is placed in the deposition area.Similarly,when the baffle is placed in the transit area,the obstruction effect on debris flow mass is also greater than that when the baffle is placed in the deposition area.Through orthogonal experimental range analysis,when the impact on the first row of baffles is used as the evaluation criterion,the importance of each influencing factor is ranked asα>P>S_(r)>h.When the mass of debris flow behind the baffle is regarded as the evaluation criterion,the rank is changed to P>α>S_(r)>h.The experimental simulation results show that the optimal baffle arrangement is:P_(5),S_(r)=16,α=35°,h=9.

关 键 词：Debris flow BAFFLE Protective effect Discrete element 

分 类 号：P642.23[天文地球—工程地质学]