Physical model test on the support characteristic for quasi-NPR bolt under asymmetric stress

作     者：Wei Ming Xiaojie Yang Yadong Mao Xiang Wang Manchao He Zhigang Tao 

作者机构：State Key Laboratory for Geomechanics and Deep Underground EngineeringChina University of Mining and Technology-BeijingBeijing 100083China School of Mechanics and Civil EngineeringChina University of Mining and Technology-BeijingBeijing 100083China 

出 版 物：《Underground Space》 (地下空间（英文）)

年 卷 期：2023年第11卷第4期

页      面：46-62页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070303[理学-有机化学] 0703[理学-化学] 

基　　金：supported by the general program of the National Natural Science Foundation of China(Grant No.52074295) the Special Fund for Basic Scientific Research Business Expenses of Central Universities,China(Grant No.2022YJSSB06) State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining&Technology,Beijing,China(Grant No.SKLGDUEK202217) 

主　　题：Asymmetric stress Physical model test Quasi-NPR bolt Support characteristic 

摘      要：With the continuous increase in tunnel construction,the significant deformation of the surrounding tunnel rock is often difficult to predict and *** addition,the lithology,structure,and various asymmetric large deformation of surrounding rock mass during operation and maintenance severely affect the ultimate bearing and stability of the *** explore the deformation mechanisms and failure modes of surrounding rock under large asymmetric stress and complex geological conditions,a physical model of a tunnel through granite was constructed based on the similarity *** model had 30°dip lithology under asymmetric stress and was emplaced a new quasi-negative Poisson’s ratio(NPR)*** analyzing the variation law of displacement and axial force of the bolt under an asymmetric load,the asymmetric deformation and failure mechanism of the granite tunnel and the support effect of the quasi-NPR bolt were *** energy absorbed by the surrounding rock was analyzed,and the influence mechanism and control countermeasures of asymmetric stress on the granite tunnel were *** work provides a reference for the design of asymmetric support of tunnels with similar engineering backgrounds.