Lateral compression and energy absorption of foamed concrete-filled polyethylene circular pipe as yielding layer for high geo-stress soft rock tunnels

作     者：Chaoxuan Zhang Xianjun Tan Hongming Tian Weizhong Chen Chaoxuan Zhang;Xianjun Tan;Hongming Tian;Weizhong Chen

作者机构：State Key Laboratory of Geomechanics and Geotechnical EngineeringInstitute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China University of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2022年第32卷第5期

页      面：1087-1096页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：The authors gratefully acknowledge the support of National Natural Science Foundation of China(No.51991392) the Second Tibetan Plateau Scientific Expedition and Research Program(STEP)of China(No.2019QZKK0904) the National Outstanding Youth Science Fund Project of National Natural Science Foundation of China(No.51922104) Youth Innovation Promotion Association CAS 

主　　题：Soft rock Yielding layer Foamed concrete Polyethylene pipe Lateral compression Energy absorption 

摘      要：Foamed concrete as energy absorption material for high geo-stress soft rock tunnels has been proven to be feasible due to its high compressibility and ***,the lengthy curing and defoaming problems caused by the cast-in-place method of large-volume foamed concrete remain *** this study,we propose a novel energy absorber composed of foamed concrete-filled polyethylene(FC-PE)pipe and analyze its deformation and energy absorption capacity via quasi-static lateral compression *** show that FC-PE pipes exhibit typical three-stage deformation characteristics,comprising the elastic stage,the plastic plateau,and the densification ***,the plateau stress,energy absorption,and specific energy absorption of the specimens are 0.81–1.91 MPa,164–533 J,and 1.4–3.6 J/g,*** the density of the foamed concrete increases,the plateau stress and energy absorption increase ***,the length of the plastic plateau and energy absorption efficiency ***,based on the vertical slice method,progressive compression of core material,and the 6 plastic hinges deformation mechanism of the pipe wall,a theoretical calculation method for effective energy absorption is established and achieves good agreement with experimental results,which is beneficial to the optimization of the composite structure.