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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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shear behaviours and roughness degeneration based on a quantified rock joint surface description

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International Journal of Mining Science and Technology 2023年第10期33卷 1301-1316页

作者： Shubo Zhang Gang Wang Yujing Jiang Changsheng Wang Feng Xu Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation Shandong University of Science and TechnologyQingdao 266590China College of Civil Engineering Fujian University of TechnologyFuzhou 350118China Graduate School of Engineering Nagasaki UniversityNagasaki 852-8521Japan

The asperity wear of rock joints significantly affects their shear *** study discusses the wear damage of the asperities on the joint surface,highlighting the roughness degradation characteristics during the shear *** direct shear experiment of artificial specimens containing rock joints was conducted under different normal stresses based on three-dimensional scanning *** experimental results showed the contribution of joint wear to roughness degeneration,such as the height,zone,and volume of asperity *** wear coefficient of the rock joint was obtained based on the volume wear of asperities in the laboratory *** functional relationship between the friction coefficient and wear coefficient is subsequently *** quantitatively analyse the wear damage of a joint surface,a calculation method for determining the wear depth of the rock joint after shearing was proposed based on wear *** relationship between the ultimate dilation and wear depth was analysed.A coefficient m,which can describe the damage degree of the joint surface,and a prediction method of joint surface roughness after shearing are *** agreement between analytical predictions and measured values demonstrates the capability of the developed ***,the sensitivity factors on the wear depth are explored.

关键词： Rock joint Roughness shear behaviour Wear Asperity

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Experimental shear Study on Reinforced High Strength Concrete Beams Made Using Blended Cement

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Journal of Architectural Environment & Structural Engineering Research 2022年第1期5卷 9-16页

作者： Brijesh Singh Vikas Patel P.N.Ojha Amit Trivedi V.V.Arora National Council for Cement and Building Materials BallabgarhHaryanaIndia

With the increased application of High Strength Concrete(HSC)in construction and lack of proper guidelines for structural design in India,behavioral study of high strength concrete is an important aspect of *** on the behavior of HSC reinforced beams with concrete strength more than 60 MPa has been carried out in the past and is still continuing to understand the structural behavior of HSC *** with the many benefits of the high strength concrete,the more brittle behavior is of concern which leads to sudden *** paper presents the behavior of reinforced HSC beams in shear with considering the effects of various factors like shear reinforcement ratio,longitudinal reinforcement ratio,l/d ratio(length to depth ratio),*** numbers Reinforced Concrete Beams of various sizes using concrete mix with three different w/c ratios(0.46,0.26 and 0.21)were cast for shear strength *** beams were tested in simply supported condition over two fixed steel pedestals with load rate of 0.2 mm/minute in displacement ***-point deflection was measured using LVDT.A comparative analysis of theoretical approaches of Euro code,extension of current IS code up to M90 and the experimental data was done to understand the behavior of *** capacities of beams without any factors of safety were used to assess the actual capacities and then was compared with the experimental capacity *** of this study can be used in the design of high strength concrete and will be more reliable in Indian continent as the regional materials and exposure conditions were considered.

关键词： High strength concrete shear capacity Reinforced concrete beams shear behaviour Span to depth ratio

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