A new elastoplastic model for bolt-grouted fractured rock  

作　　者：Haoyi Li Shuangying Zuo Peiyuan Lin 

机构地区：[1]State Key Laboratory for Tunnel Engineering,Sun Yat-Sen University,Guangzhou 510275,China [2]Southern Marine Science and Engineering Guangdong Laboratory,Zhuhai 519082,China [3]School of Civil Engineering,Sun Yat-Sen University,Guangzhou 510275,China [4]College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,China

出　　处：《International Journal of Mining Science and Technology》2024年第7期995-1016,共22页矿业科学技术学报（英文版）

基　　金：funded by the National Key Research and Development Plan(No.2022YFC3203200);Department of Science and Technology of Guangdong Province(No.2021ZT09G087);the National Natural Science Foundation Project of China(No.42167025).

摘　　要：Complexities in mechanical behaviours of rock masses mainly stem from inherent discontinuities,which calls for advanced bolt-grouting techniques for stability enhancement.Understanding the mechanical properties of bolt-grouted fractured rock mass(BGFR)and developing accurate prediction methods are crucial to optimize the BGFR support strategies.This paper establishes a new elastoplastic(E-P)model based on the orthotropic and the Mohr-Coulomb(M-C)plastic-yielding criteria.The elastic parameters of the model were derived through a meso-mechanical analysis of composite materials mechanics(CMM).Laboratory BGFR specimens were prepared and uniaxial compression test and variable-angle shear test considering different bolt arrangements were carried out to obtain the mechanical parameters of the specimens.Results showed that the anisotropy of BGFR mainly depends on the relative volume content of each component material in a certain direction.Moreover,the mechanical parameters deduced from the theory of composite materials which consider the short fibre effect are shown to be in good agreement with those determined by laboratory experiments,and the variation rules maintained good consistency.Last,a case study of a real tunnel project is provided to highlight the effectiveness,validity and robustness of the developed E-P model in prediction of stresses and deformations.

关 键 词：Bolt-grouted fractured rock mass Elastoplastic model Composite materials mechanics Laboratory experiment 

分 类 号：TD353.6[矿业工程—矿井建设]