Numerical simulation of the interfacial behaviour of grouted rockbolts in tunnel support based on a tri-linear bond-slip model

FF Ren, James Yang, C Xu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Grouted rockbolts are widely used in tunneling excavation. However, the rockbolt design is still basically empirical, the mechanical behavior of grouted rockbolts, especially the interfacial behavior, has never been studied systematically. First of all, a tri-linear bond slip model is proposed for modeling the rockbolt interfacial behavior. Then analytical solutions to grouted rockbolt are presented on the basis of a tri-linear bond-slip model. Finally, a numerical model using Abaqus program to simulate the tunnel rockbolt is proposed. This model uses cohesive elements to simulate debonding along the anchorage interfaces, meanwhile, tabular damage variable is obtained on the basis of the damage evolution law in order to correspond with the tri-linear material model. The developed model was validated by monitored data. It was found that the model was capable of predicting accurately the interfacial shear stress distribution, load on the bolt as well as the rock movements. Therefore, this model can be used to optimize the control parameters of grouted rockbolts.
Original languageEnglish
Pages (from-to)1769-1774
JournalAdvanced Materials Research
Volume446
DOIs
Publication statusPublished - 2012
Externally publishedYes

Fingerprint

Tunnels
Computer simulation
Debonding
Bolts
Excavation
Stress concentration
Shear stress
Numerical models
Loads (forces)
Rocks

Cite this

@article{95930de3e33c4ab383bdd0dee4fc075e,
title = "Numerical simulation of the interfacial behaviour of grouted rockbolts in tunnel support based on a tri-linear bond-slip model",
abstract = "Grouted rockbolts are widely used in tunneling excavation. However, the rockbolt design is still basically empirical, the mechanical behavior of grouted rockbolts, especially the interfacial behavior, has never been studied systematically. First of all, a tri-linear bond slip model is proposed for modeling the rockbolt interfacial behavior. Then analytical solutions to grouted rockbolt are presented on the basis of a tri-linear bond-slip model. Finally, a numerical model using Abaqus program to simulate the tunnel rockbolt is proposed. This model uses cohesive elements to simulate debonding along the anchorage interfaces, meanwhile, tabular damage variable is obtained on the basis of the damage evolution law in order to correspond with the tri-linear material model. The developed model was validated by monitored data. It was found that the model was capable of predicting accurately the interfacial shear stress distribution, load on the bolt as well as the rock movements. Therefore, this model can be used to optimize the control parameters of grouted rockbolts.",
author = "FF Ren and James Yang and C Xu",
year = "2012",
doi = "10.4028/www.scientific.net/AMR.446-449.1769",
language = "English",
volume = "446",
pages = "1769--1774",
journal = "Advanced Materials Research",
issn = "1662-8985",
publisher = "Trans Tech Publications",

}

TY - JOUR

T1 - Numerical simulation of the interfacial behaviour of grouted rockbolts in tunnel support based on a tri-linear bond-slip model

AU - Ren, FF

AU - Yang, James

AU - Xu, C

PY - 2012

Y1 - 2012

N2 - Grouted rockbolts are widely used in tunneling excavation. However, the rockbolt design is still basically empirical, the mechanical behavior of grouted rockbolts, especially the interfacial behavior, has never been studied systematically. First of all, a tri-linear bond slip model is proposed for modeling the rockbolt interfacial behavior. Then analytical solutions to grouted rockbolt are presented on the basis of a tri-linear bond-slip model. Finally, a numerical model using Abaqus program to simulate the tunnel rockbolt is proposed. This model uses cohesive elements to simulate debonding along the anchorage interfaces, meanwhile, tabular damage variable is obtained on the basis of the damage evolution law in order to correspond with the tri-linear material model. The developed model was validated by monitored data. It was found that the model was capable of predicting accurately the interfacial shear stress distribution, load on the bolt as well as the rock movements. Therefore, this model can be used to optimize the control parameters of grouted rockbolts.

AB - Grouted rockbolts are widely used in tunneling excavation. However, the rockbolt design is still basically empirical, the mechanical behavior of grouted rockbolts, especially the interfacial behavior, has never been studied systematically. First of all, a tri-linear bond slip model is proposed for modeling the rockbolt interfacial behavior. Then analytical solutions to grouted rockbolt are presented on the basis of a tri-linear bond-slip model. Finally, a numerical model using Abaqus program to simulate the tunnel rockbolt is proposed. This model uses cohesive elements to simulate debonding along the anchorage interfaces, meanwhile, tabular damage variable is obtained on the basis of the damage evolution law in order to correspond with the tri-linear material model. The developed model was validated by monitored data. It was found that the model was capable of predicting accurately the interfacial shear stress distribution, load on the bolt as well as the rock movements. Therefore, this model can be used to optimize the control parameters of grouted rockbolts.

U2 - 10.4028/www.scientific.net/AMR.446-449.1769

DO - 10.4028/www.scientific.net/AMR.446-449.1769

M3 - Article

VL - 446

SP - 1769

EP - 1774

JO - Advanced Materials Research

JF - Advanced Materials Research

SN - 1662-8985

ER -