An analytical analysis for the mechanical performance of fully-grouted rockbolts based on the exponential softening model

作     者：Zhongwen Yue Akang Li Peng Wang Peng Wang Zhongwen Yue;Akang Li;Peng Wang

作者机构：Department of Mechanics and Civil EngineeringChina University of Mining and Technology-BeijingBeijing 100083China Pan-China Construction Group Co.Ltd.Beijing 100070China 

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：981-995页

核心收录：

学科分类：081401[工学-岩土工程] 08[工学] 0814[工学-土木工程] 

基　　金：This work was financially supported by the National Key Research and Development Program of China(No.2021YFC2902103) Meanwhile,the authors would also like to acknowledge the support provided by Beijing Gold-Bridge Funds and Beijing Excellent Young Engineer Innovation Studio 

主　　题：Fully-grouted rockbolts Non-linear response Bond-slip model Anchor length Analytical solutions 

摘      要：This paper presented a novel bond-slip model to better reveal the mechanical behavior of the bolt-grout interface for fully-grouted rockbolts under tensile loads by considering the non-linear response in the softening *** exponential decay function is adopted for describing the non-linear response in the softening *** on the improved bond-slip model,the corresponding analytical solutions for the interfacial shear stress and the axial force of the bolt under different loading stages are ***,the validity of this proposed model was verified by comparing with the experimental *** results show that compared with the linear softening model,the proposed model is more suitable for predicting the mechanical performance of fully-grouted ***,a series of parametric studies are conducted to explore the effect of model parameters on the mechanical properties of fully-grouted *** results indicate that compared with the anchor length,the bolt diameter and the bond strength of the bolt-grout interface have a significance influence on the ultimate load of bolt,especially for the elastic and softening ***,it can be found that using the linear softening model maybe overestimates the supporting performance of grouted bolt,resulting in an unsafe design for bolt.