An novel energy dissipator with self-recovery capability after deformation for structurally energy-dissipating rock-shed  

作　　者：XIE Qi-jun SU Li-jun BAI Hao TANG Hao ZHANG Chong-lei YU Fang-wei 

机构地区：[1]Key Laboratory of Mountain Hazards and Earth Surface Processes,Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041,China [2]Sichuan Expressway Construction&Development Group CO.,LTD.,Chengdu 610041,China [3]China-Pakistan joint Research Center on Earth Sciences,CAS-HEC,Islamabad 45320,Pakistan [4]University of Chinese Academy of Sciences,Beijing 100049,China [5]College of Environment and Civil Engineering in Chengdu University of Technology,Chengdu 610051,China

出　　处：《Journal of Mountain Science》2021年第11期3058-3068,共11页山地科学学报（英文）

基　　金：The research reported in this manuscript was funded by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA20030301);the International Partnership Program of the Chinese Academy of Sciences(Grant No.131551KYSB20180042);“Belt&Road”international cooperation team for the“Light of West”program of CAS(Su Lijun),Sichuan Science and Technology Program(Grant No.2021YJ0040);CAS“Light of West China”Program(Grant No.E0R2160).

摘　　要：Theperformanceof a structurally dissipating rock-shed(SDR)depends largely onthecapacityofitsenergy dissipators.At present,mostenergy dissipatorsare made of metals,which dissipateenergy by unrecoverable plastic deformation.Therefore,they are not able to recover their energy-dissipation capacity after deformation under rockfall impact.However,a rockfall usually disintegrates into pieces when it rolls down from a higher position and results in multiple rockfall impacts.An energy dissipator with self-recovery capability is therefore more suitable for ensuring the safety of SDRs.Replacing metal with polyurethane(a hyperelastic material with remarkable self-recovery capability)can provide self-recovery capability for energy dissipators,making them more suitable for resisting multiple rockfall impacts.In this work,polyurethane was manufactured into twotypes ofenergy dissipators:cylindrical and cubical.Full-scale falling rock impact testsand dynamic numerical simulationswereconducted to study the mechanical response of the energy dissipators.In addition,in order to ensure the accuracy of the simulation,the dynamic mechanical properties of the polyurethanewere tested and its dynamic constitutive model was established.The experimental and simulation tests have clarified the advantages of the polyurethane energy dissipator.We also summarized the practical considerations in the design of energy dissipators.

关 键 词：Recoverableenergy dissipator Dynamic constitutive model Rockfall test Numerical simulation Resist multiple impacts 

分 类 号：TV653[水利工程—水利水电工程]