Study on the mixing state of resin cartridge and characteristics of bolt reaction torque during eccentric anchoring process
FU Mengxiong
LIU Jiarun
LIU Shaowei
HE Deyin
JIA Housheng
YAO Bing'ao
XI Xiaolong
Abstract：The mixing process of resin is a critical stage for the formation of adequate anchoring force of bolts.As a common anchoring defect of bolt,the degree of eccentricity may affect the mix-ing state of resin and the mechanical characteristics of bolt.Therefore,this paper uses theoretical analysis,numerical simulation and laboratory test methods to explore the mixing state of anchoring under the condition of anchoring eccentricity,and analyzes the response characteristics of bolt reac-tion torque under different anchoring eccentricity.The results show that eccentric anchoring ad-versely affects the mixing state of the resin.This leads to reduced breakdown of the resin pouches,uneven distribution of the resin mixture,and decreased compactness and integrity of the cured an-choring structure.Consequently,the reaction torque response characteristics of bolt during mixing are affected,resulting in poorer stability of the cured structure and ultimately weakening the load-bearing capacity of the anchoring system.The reaction torque-time curve of the bolt during mixing exhibits a distinct segmented characteristic,initially showing a significant rise followed by a ten-dency to stabilize.When the bolt passing through the resin cartridge,the root mean square(RMS)value,crest factor and variance of the change rate of bolt reaction torque increase with the eccentric-ity.In the mixing stage after the bolt reaches the bottom,the mean value of bolt reaction torque in-creases with the bolt eccentricity.Taking the characteristic value of bolt reaction torque change rate and the mean value of reaction torque during the mixing process of resin as the index to identify the bolt eccentricity,a tentative idea of identifying the anchoring eccentricity based on bolt reaction torque was proposed.The research conclusions provide a theoretical reference for the future realiza-tion of non-destructive and rapid assessment of bolt anchoring quality.
Keywords：roof boltingeccentric anchoringresin cartridge mixingbolt reaction torquenon-de-structive testing
Publication Date：2026-01-30
Online Publishing Date：2026-01-28(First online date of this platform, not the publication date of the document)
Pages：14( 104-117 )