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• W2360219284 abstract "Bolt or cable supporting technology which is active supporting method to control the surrounding rock stability has been widely applied in underground coal mining in China.Based on the complexity of surrounding rock,principles of bolt supporting have not yet common and completely understood,the bolt supporting need more study on the anchorage mechanism,interactive relationship with the surrounding rock,stress distribution along the embedded direction,bolt bearing characteristic and etc.This study took epoxy boned bolt system and bolt supported in coal mine roadway as research back ground,applied theoretical analysis,numerical simulation,field measurement,laboratory test and engineering practice to explore the mechanical behavior of epoxy bonded bolt system and bolt bearing characteristic.The following findings were made:(1) Four main failure types of epoxy bolt supporting were analyzed and summaried,and imperfectly epoxy bonded failure and long-term creep failure of epoxy bonded bolt system that belong to adhensive failure type were emphatically analyzed.A theoretical model of epoxy bonded bolt system with an imperfect bonding adhesive layer was proposed,based on the this model,the formulas of axial stress in the blot and the shear stress at the bolt-epoxy interface along the embedded direction have been obtained and shown as a piecewise function.Simultaneously,an analytical model of epoxy bonded bolt system considering the visco-elastic effect of the adhesive layer was developed,based on the proposed model,the time dependent formulas of tensile stress and shear stress at the bolt and epoxy interface along the anchor's direction have been obtained.The closed form equation of the long-term load end displacement was derived,additionally,the time dependent of initial debonding load Pini.(2) Mechanical parameters of the surrounding rock,bolt,etc.were obtained through laboratory mechanical tests.Two suggested models were compared with the FEM simulation in ABAQUS,then the distribution of bolt stress along the longitude direction of bolt in both models were studied,and the evolution process of stress and displacement in bolt system were also presented.Subsequently,parametric study of the constituent parameters of the epoxy bonded bolt system,such as bolt diameter,epoxy layer thickness,etc.were conducted to demonstrate their effects on the the epoxy bonded bolt system.(3) Bolt performance comprehensive experiment bar for pre-stress bolt system and underground bolt pull-out tests were used to study the distribution and bearing behavior of epoxy bonded bolt system with different pre-stress,the relationship between pre-stress and displacement of bolt endpoint was alos carried out.The research results were preliminary indicated that the bearing stress in bolt under its working condition was complicated and changeable,and bearing stress concentrated around bolt neutral point.(4) Based on analysis of shortage of present roadway surrounding rock monitoring methods and excellence of FBG sensing technology,a dynamic real-time monitoring system for roadway surrounding rock in coal mine was proposed and successly used to monitor the distribution and evolution of stress in bolt in roadway in coal mine.(5) Finally,several principles to ensure bolt supporting effect were proposed based on the above results and successfully appied in track transportation gateways of 1115(1) working face of Guqiao coalmine and 1111(1) working face of Zhuji coalmine,Huainan mining group.Simultaneously,track transportation gateway in 1111(1) working face of Zhuji coalmine in Huainan mining group was took as engineering background,the real-time on-line monitoring system for roadway surrounding rock activity in coal mine was successfully applied to monitor the ground pressure during its gob-side entry retaining." @default.
• W2360219284 created "2016-06-24" @default.
• W2360219284 creator A5067607038 @default.
• W2360219284 date "2012-01-01" @default.
• W2360219284 modified "2023-09-23" @default.
• W2360219284 title "Study on mechanical bebavior of epoxy bonded bolt system and bolt bearing characteristic in coal mine roadway" @default.
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