Effects of Thickness of Roof Layers on Optimum Design of Truss Bolt System Using Finite Element Modeling Techniques

Electronic journal of geotechnical engineering

Kazem Ghabraie²  Behrooz Ghabraie*, Gang Ren¹ 

[1] School of Civil, Environmental and Chemical Engineering, RMIT University, GPO Box 2475V, Melbourne VIC 3001, Australia*Corresponding Author;Faculty of Engineering and Surveying, University of Southern Queensland, West Street, Toowoomba, QLD 4350, Australia

关键词: Truss bolt;    ground reinforcement;    FEM;    optimum design;   

DOI  :  

来源: Oklahoma State University

【 摘 要 】

Inundergroundexcavations,optimumdesignofreinforcementsystemsislargelybasedongeologicalfeaturesofthesurroundingrocksuchasin-situstressdistribution,rockstrengthproperties,thicknessofthelayers,etc.Incurrentdesignoftrussboltsystemstheseparametersareyettobeconsidered.Inthisstudy,effectsofchangingthicknessofrooflayersonoptimumdesignoftrussbolthavebeeninvestigatedusingthreestabilityindicators,namelyreductionintheloosenedareaabovetheroof,numberofplasticpointsandhorizontalmovementonthefirstbeddingplane.Totalof7differentbeddingconfigurationshavebeengeneratedand100differenttrussboltdesignshavebeentestedoneachbeddingconfiguration.Resultsshowedthatbychangingthethicknessoftherooflayers,theoptimumdesignoftrussboltchangesdrastically.Inhighlylaminatedformations,ithasbeendemonstratedthatagentlyinclinedboltangleismoreeffective,whilebyincreasingthethicknessofrooflayers,trussboltsystemswithahigherboltangleandlongerbolts,i.e.similartosystematicrockboltsystems,respondsbetter.

【 授权许可】

Unknown