首页|Optimal array layout of cylindrical baffles to reduce energy of rock avalanche

Optimal array layout of cylindrical baffles to reduce energy of rock avalanche

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The array of baffles protection structure is a flow resistance structure with good drainage,blocking,and intercepting effects on the rock avalanches.In this research,the physical model test on rock avalanches was conducted.Three parameters(column spacing,row spacing,and a number of baffles) were used as indicators to determine the optimal layout of the array of baffles for energy efficiency consumption blocking.Then,the lattice Boltzmann numerical simulation method was used to build a numerical simulation model of rock avalanches-array of the baffles-hazard-bearing body to obtain the rock's velocity attenuation and flow trajectory avalanches in the impact baffle protection structure.Finally,the results of the physical model test and the numerical simulation were mutually confirmed.The following conclusions were drawn through two methods of physical model test and numerical simulation.(1) The optimal layout parameters of array of baffles were determined as three rows of array of baffles (The number of baffles in each row is 7,8,9),column spacing Sc=3.5,and row spacing Sr=4.5.(2) Under the conditions of high baffle density (such as Sc=1.5,2.5),the rock avalanches would produce a certain degree of circumfluence,which would increase the fluid velocity by at least 24.5％ over the average velocity,so the column spacing density should be increased appropriately to achieve the optimal effect of reducing the energy of rock avalanches.(3) In the event of a prototype grooved rock avalanches with a velocity close to 24.5 m/s and a flow depth of about 1.5 m,the three-row array of baffles protection with the parameters Sc*=1.18 m and Sr* =1.51 m could be arranged,playing the role of optimizing the array of baffles to guide the flow and block the energy consumption.LBM experiments can be used to replace laboratory experiments to some extent.Further Lattice Boltzmann method-Discrete element method (LBM-DEM) studies are required before applications to practical engineering.

Lattice BoltzmannPhysical modelNumerical simulationEnergy consumption optimization

BI Yu-zhang、WANG Dong-po、FU Xian-lei、LIN Yi-xiong、SUN Xin-po、JIANG Zhe-yuan

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B-Z geotechnical Company,Nanjing 210096,China

State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China

College of Civil Engineering,Sichuan University of Science and Engineering,Zigong 643000,China

Jiangsu Key Laboratory of Urban Underground Engineering & Environmental Safety,Institute of Geotechnical Engineering,Southeast University,Nanjing 210096,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaScience Foundation for Distinguished Young Scholars of Sichuan ProvinceScientific Research Foundation of Graduate School of Southeast UniversityPostgraduate Research & Practice Innovation Program of Jiangsu ProvinceCAS Original Innovation Program

41877266415210022020JDJQ0044YBJJ 1844KYCX17_0130ZDBS-LY-DQC039

2022

山地科学学报(英文版)
中国科学院水利部成都山地灾害与环境研究所

山地科学学报(英文版)

CSTPCDCSCDSCI
影响因子：0.228
ISSN：1672-6316
年,卷(期)：2022.19(2)
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