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Optimization of the fully grouted rock bolts for load transfer enhancement

International Journal of Mining Science and Technology 2015年第5期25卷 707-712页

作者： Ghadimi Mostafa Shahriar Korosh Jalalifar Hossein Department of Mining Engineering Tehran Science and Research BranchIslamic Azad University Faculty of Mining Metallurgy and Petroleum EngineeringAmir Kabir University of Technology Department of Petroleum and Mining Engineering Environmental and Energy Research CenterShahidBahonar University of Kerman

The purpose of this study is to investigate the role of bolt profile configuration in load transfer capacity between the bolt and ***,five types of rock bolts are used with different *** rock bolts are modeled by ANSYS *** show that profile rock bolt T_3 and T_ with load capacity 180 and 195 kN in the jointed rocks,are the optimum ***,the performances of the selected profiles are examined in Tabas Coal Mine by FLAC *** is good subscription between the results of numerical modeling and instrumentation reading such as tells tale,sonic extensometer and strain gauge rock *** to the finding of this study,the proposed pattern of rock bolts,on 7 + 6 patterns per meter with 2 flexi bolt(4 m) for support gate road.

关键词： fully grouted rock bolts Numerical modeling Load transfer Bolt profile

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Utilizing a novel fiber optic technology to capture the axial responses of fully grouted rock bolts

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Journal of rock Mechanics and Geotechnical Engineering 2018年第2期10卷 222-235页

作者： Nicholas Vlachopoulos Daniel Cruz Bradley Forbes Department of Civil Engineering Royal Military College of Canada Department of Geological Sciences and Geological Engineering Queen's UniversityKingston

rock bolts are one of the primary support systems utilized in underground excavations within the civil and mining engineering industries. rock bolts support the weakened rock mass adjacent to the opening of an excavation by fastening to the more stable, undisturbed formations further from the excavation. The overall response of such a support element has been determined under varying loading conditions in the laboratory and in situ experiments in the past four decades; however, due to the limitations with conventional monitoring methods of capturing strain, there still exists a gap in knowledge associated with an understanding of the geomechanical responses of rock bolts at the microscale. In this paper, we try to address this current gap in scientific knowledge by utilizing a newly developed distributed optical strain sensing(DOS) technology that provides an exceptional spatial resolution of 0.65 mm to capture the strain along the rock bolt. This DOS technology utilizes Rayleigh optical frequency domain reflectometry(ROFDR) which provides unprecedented insight into various mechanisms associated with axially loaded rebar specimens of different embedment lengths, grouting materials, borehole annulus conditions, and borehole diameters. The embedment length of the specimens was found to be the factor that significantly affected the loading of the rebar. The critical embedment length for the fully grouted rock bolts(FGRBs) was systematically determined to be430 mm. The results herein highlight the effects of the variation of these individual parameters on the geomechanical responses FGRBs.

关键词： Fiber optic technology fully grouted rock bolts Load transfer Stress distribution

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