Numerical and Rational Analysis of Shotcrete Lining for Rock Tunnels under Effect of Explosion Loads
Location
Chicago, Illinois
Date
02 May 2013, 7:00 pm - 8:30 pm
Abstract
Tunnels in rock media are considered one of the most important types of fortified structures that can be used to resist the progressive development of military destructive weapons. The geological formation of tunnel rock mass has a great influence on the degree of protection to human and weapons. This protection degree is based mainly on both the utilized system of tunnel lining and the type and quality of rock mass which reduces the effect of wave propagation generated by explosion. Shotcrete lining is one of the most commonly used support system used in tunnel lining. Understanding the dynamic response and damage characteristics of shotcrete lining for rock tunnels due to explosion loads is essential for safe design. The main aim of this paper is to investigate the stresses and displacements of shotcrete lining under blasting loads and the effect of different of rock mass qualities on the wave propagation associated with the explosion. In order to achieve this aim, numerical analysis technique, commercial software package, AUTODYN version 6.1 is used to perform 90 three-dimensional elasto-plastic dynamic models to analyze rock-shotcrete lining interaction. A parametric study was carried out taking into consideration the effect of Rock Mass Rating (RMR), tunnel radius, charge weight and detonation distance. The numerical simulation of explosion in rock mass is extremely demanding, requiring hydrodynamic computer codes, combined with non-linear dynamic codes based on finite elements which is a very complex approach. Therefore, regression analysis is used for statistics prediction of the behavior of shotcrete lining. A rational analysis is conducted to form non-linear equations to predict stresses and displacements of shotcrete lining at tunnel crown based on the results of the parametric study. The suggested equations were used to form design charts for different values of Rock Mass Rating. A comparison between the results of the numerical simulation and rational analysis for the different models showed a good matching.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
7th Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2013 Missouri University of Science and Technology, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Belal, Adel M. and Hassan, Hazem A., "Numerical and Rational Analysis of Shotcrete Lining for Rock Tunnels under Effect of Explosion Loads" (2013). International Conference on Case Histories in Geotechnical Engineering. 13.
https://scholarsmine.mst.edu/icchge/7icchge/session05/13
Numerical and Rational Analysis of Shotcrete Lining for Rock Tunnels under Effect of Explosion Loads
Chicago, Illinois
Tunnels in rock media are considered one of the most important types of fortified structures that can be used to resist the progressive development of military destructive weapons. The geological formation of tunnel rock mass has a great influence on the degree of protection to human and weapons. This protection degree is based mainly on both the utilized system of tunnel lining and the type and quality of rock mass which reduces the effect of wave propagation generated by explosion. Shotcrete lining is one of the most commonly used support system used in tunnel lining. Understanding the dynamic response and damage characteristics of shotcrete lining for rock tunnels due to explosion loads is essential for safe design. The main aim of this paper is to investigate the stresses and displacements of shotcrete lining under blasting loads and the effect of different of rock mass qualities on the wave propagation associated with the explosion. In order to achieve this aim, numerical analysis technique, commercial software package, AUTODYN version 6.1 is used to perform 90 three-dimensional elasto-plastic dynamic models to analyze rock-shotcrete lining interaction. A parametric study was carried out taking into consideration the effect of Rock Mass Rating (RMR), tunnel radius, charge weight and detonation distance. The numerical simulation of explosion in rock mass is extremely demanding, requiring hydrodynamic computer codes, combined with non-linear dynamic codes based on finite elements which is a very complex approach. Therefore, regression analysis is used for statistics prediction of the behavior of shotcrete lining. A rational analysis is conducted to form non-linear equations to predict stresses and displacements of shotcrete lining at tunnel crown based on the results of the parametric study. The suggested equations were used to form design charts for different values of Rock Mass Rating. A comparison between the results of the numerical simulation and rational analysis for the different models showed a good matching.
