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Experimental study on the shear performance of quasi-NPR steel bolted rock joints

Journal of rock Mechanics and Geotechnical Engineering 2023年第2期15卷 350-362页

作者： Manchao He Shulin Ren Haotian Xu Senlin Luo Zhigang Tao Chun Zhu State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyBeijing100083China School of Mechanics and Civil Engineering China University of Mining and TechnologyBeijing100083China School of Earth Sciences and Engineering Hohai UniversityNanjing210098China

Quasi-NPR(negative Poisson’s ratio)steel is a new type of super bolt material with high strength,high ductility,and a micro-negative Poisson’s *** material overcomes the contrasting characteristics of the high strength and high ductility of steel and it has significant energy-absorbing characteristics,which is of high value in deep rock and soil support ***,research on the shear resistance of quasi-NPR steel has not been carried *** study the shear performance of quasi-NPR steel bolted rock joints,indoor shear tests of bolted rock joints under different normal stress conditions were carried out.Q235 steel and#45 steel,two representative ordinary bolt steels,were set up as a control group for comparative tests to compare and analyze the shear strength,deformation and instability mode,shear energy absorption characteristics,and bolting contribution of different types of *** results show that the jointed rock masses without bolt reinforcement undergo brittle failure under shear load,while the bolted jointed rock masses show obvious ductile failure *** shear deformation ca-pacity of quasi-NPR steel is more than 3.5 times that of Q235 steel and#45 *** fracture occurs in the quasi-NPR steel during large shear deformation and it can provide stable shear ***,the other two types of control bolts become fractured under the same ***-NPR steel has significant energy-absorbing characteristics under shear load and has obvious advantages in terms of absorbing the energy released by shear deformation of jointed rock masses as compared with ordinary *** particular,the shear force plays a major role in resisting the shear deformation of Q235 steel and#45 steel,therefore,fracture failure occurs under small bolt ***,the axial force of quasi-NPR steel can be fully exerted when resisting joint shear deformation;the steel itself does not break when large shear deformation occurs,and the

关键词： Energy absorption bolt Quasi-NPR(Negative Poisson’s ratio)steel bolted rock joints Shear test Shear performance

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Analytical model of shear mechanical behaviour of bolted rock joints considering influence of normal stress on bolt guide rail effect

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Journal of Central South University 2021年第5期28卷 1505-1518页

作者： ZHENG Luo-bin WANG Liang-qing ZHU Lin-feng Faculty of Engineering China University of GeosciencesWuhan 430074China

rock bolts have been widely used in slopes as a reinforcement *** the shear mechanical behaviours of bolted rock joints is very complicated due to the complex factors that affect the axial force and shear force on the *** bolts under shear action exhibit the guide rail effect;that is,the rock mass slides along the rock bolt as if the rock bolt is a *** normal stress can inhibit the guide rail effect and reduce the axial force on ***,this factor is not considered by the existing analysis *** tests of bolted joints under different normal stresses were carried out in the *** the test,the axial force on each point monitored on the bolt was recorded by a strain gauge,and the attenuation trend of the strain was *** analytical model that considers the inhibition of the bolt rail effect due to an increase in the normal stress was proposed to predict the shear mechanical behaviour of rock bolted *** new model accommodates the bolt shear behaviours in the elastic stage and plastic stage,and the estimated values agree well with the results of the direct shear tests in the *** validation shows that the proposed model can effectively describe the deformation characteristics of the bolts in the shear tests.

关键词： bolted rock joints shear test shear behaviour analysis model

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