The purpose of writing this book is to provide the latest research findings in ground control techniques in mining engineering, especially the rock bolting techniques. Since rock bolts are widely used in mining engineering and civil engineering, they are significant in guaranteeing the safety of underground openings. However, instability issues still occur with the rock bolting technique. Therefore, it is valuable to understand the exact load transfer mechanism of rock bolts. This book summarised the recent research work regarding rock bolting conducted by the authors. It is valuable for the readers to fully understand the reinforcing mechanism of fully grouted rock bolts.
This book focuses on the bond failure mode of fully grouted rock bolts, which is the most widely encountered failure mode in rock bolting. Different investigation approaches are used in this book, including numerical simulation, analytical modelling and experimental tests. Therefore, this book conducts a comprehensive study to reveal the bond failure process of fully grouted rock bolts. Moreover, it reveals the corresponding bond failure mechanism. Therefore, it helps the reads to fully understand the bond failure mechanism of rock bolting. Moreover, it helps the readers to develop new approaches and methods to prevent failure of the rock bolting system.This is an open access book.
Author(s): Jianhang Chen, Yongliang Li, Junwen Zhang
Series: SpringerBriefs in Applied Sciences and Technology
Publisher: Springer
Year: 2023
Language: English
Pages: 117
City: Singapore
Preface
Contents
1 Introduction
1.1 Background
1.2 Book Outline
References
2 Analysis on the Shear Stress Propagation Mechanism in the Rock Reinforcement System
2.1 Introduction
2.2 Previous Study on the Shear Stress Propagation
2.2.1 Investigation Approaches
2.2.2 Shear Stress Propagation Mechanism
2.3 Discussion
2.4 Conclusions
References
3 Numerical Simulation of the Shear Behaviour of Cement Grout
3.1 Introduction
3.2 Selection of the Software
3.3 Numerical Simulation Process
3.3.1 Simulation of the Cement Grout with a Higher Strength
3.3.2 Simulation of the Cement Grout with a Lower Strength
3.4 Analysis on the Shear Stress Distribution
3.5 Recommendation for Further Work
3.6 Conclusions
References
4 Analytical Modelling to Study the Load Transfer Performance of Fully Grouted Rock Bolts
4.1 Introduction
4.2 Analytical Modelling
4.2.1 Bond-Slip Model
4.2.2 Governing Equation
4.2.3 Pull-Out Stages of Rock Bolts
4.3 Calibration of the Input Parameters
4.4 Validation of the Analytical Model
4.4.1 Validation with a Pull-Out Test
4.4.2 Validation with the Other Pull-Out Test
4.5 Parametric Study
4.5.1 Elastic Modulus of the Confining Medium
4.5.2 Shear Strength of the Bolt/Grout Interface
4.5.3 Residual Shear Strength of the Bolt/Grout Interface
4.6 Conclusions
References
5 Analytical Studying the Confining Medium Diameter Impact on Load-Carrying Capacity of Rock Bolts
5.1 Introduction
5.2 Analytical Modelling Approach
5.3 Modelling Process and Results
5.4 Conclusions
References
6 Studying the Bond Performance of Fully Grouted Rock Bolts Based on the Variable Controlling
6.1 Introduction
6.2 Calculating Principal of the Constitutive Equation
6.3 Parameter Study
6.3.1 Bolt Diameter
6.3.2 Elastic Modulus of Bolts
6.3.3 Grouting Length of Bolts
6.3.4 Bond Slipping When the Bond Strength Was Reached
6.4 Limitation of the Current Study
6.5 Recommendation of Further Work
6.6 Conclusions
References
7 Analytical Modelling Rock Bolts with a Closed Nonlinear Model
7.1 Introduction
7.2 Illustration of the Analytical Model
7.3 Validation of the Analytical Model
7.4 Parametric Study
7.4.1 The First Coefficient
7.4.2 The Second Coefficient
7.4.3 Elastic Modulus of the Rock Bolt
7.4.4 Rock Bolt Diameter
7.5 Load Distribution Along a Fully Grouted Rock Bolt
7.6 Limitation and Recommendation for Future Work
7.7 Conclusions
References
