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Strength characteristics of rock anchored by npr bolt with different preloads

Journal of Mountain Science 2023年第3期20卷 834-844页

作者： SUN Xiao-ming CUI Li ZHANG Yong WANG Lei JIANG Ming State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology(Beijing)Beijing 100083China School of Mechanics and Civil Engineering China University of Mining and Technology(Beijing)Beijing 100083China

This study compares the strength characteristics of rocks anchored by npr bolts and ordinary bolts with varied preloads,based on the mechanical properties of npr bolts(with a negative Poisson’s ratio).The results show that the uniaxial compressive stress-strain curve of ordinary anchored rocks exhibits noticeable abrupt *** reaching peak strength,the bolt breaks,whereas the stress-strain curve of npr-anchored rocks is *** npr bolt enters the stage of continuous resistance after reaching maximal strength and does not *** the preload increases,the strength of the anchored rock grows linearly.A calculation equation for the strength of the anchored rock is proposed based on the *** theoretical equation fits the test results well,and the fitted parameters show that npr bolts can better increase the strength of the *** concept of dynamic toughness UC of anchored rock is proposed to reflect the comprehensive mechanical properties of anchored rock,including strength and *** the preload increases,the UC of ordinary anchored rock first decreases and then increases,while the UC of the npr anchored rock does not change significantly with the preload when the strain is small,and the UC increases with the increase of the preload when the strain is large.

关键词： npr bolt Anchored rock Rock bolt Uniaxial compression Preload Strength characteristics

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Excavation compensation and bolt support for a deep mine drift

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3206-3220页

作者： Longji Guo Zhigang Tao Manchao He Massimo Coli State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology(Beijing)Beijing100083China School of Mechanics&Civil Engineering China University of Mining and Technology(Beijing)Beijing100083China Department of Earth Sciences University of FlorenceFirenze50121Italy

To overcome large deformation of deep phosphate rock roadways and pillar damage,a new type of constant-resistance large-deformation negative Poisson’s ratio(npr)bolt that can withstand a high prestress of at least 130 KN was *** the conducted tests,the amount of deformation was 200-2000 mm,the breaking force reached 350 KN,and a high constant-resistance pre-stress was maintained during the deformation process.A stress compensation theory of phosphate rock excavation based on npr bolts is proposed together with a balance system for bolt compensation of the time-space effect and high npr *** split-set rock bolts are unable to maintain the stability of roadway roofs and *** verify the support effect of the proposed bolt,field tests were conducted using both the proposed npr bolts and split-set rock bolts as support systems on the same mining *** addition,the stress compensation mechanism of roadway mining was simulated using the particle flow code in three dimensions(PFC^(3D))-fast Lagrangian analysis of continua(FLAC^(3D))particle-flow coupling numerical ***-site monitoring and numerical simulations showed that the npr excavation compensation support scheme effectively improves the stress state of the bolts and reduces the deformation of the surrounding *** to the original support scheme,the final deformation of the surrounding rock was reduced by approximately 70%.These results significantly contribute to domestic and foreign research on phosphate-rock npr compensation support technology,theoretical systems,and engineering practices,and further promote technological innovation in the phosphate rock mining industry.

关键词： Deep phosphate rock npr bolt Split-set rock bolt PFC3D-FLAC3D Compensation support

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