Influence of Geotechnical Parameters and In-Situ Stresses on Strainburst Potential

DOI

10.2991/978-94-6463-258-3_82How to use a DOI?

Keywords

Rockburst; Deep tunnel; Numerical modelling; UCS influence

Abstract

As a result of the intense exploitation of mineral resources on the surface, mining excavations must migrate to deeper environments. At greater depths, in-situ stresses increase along with the probability of rockburst occurrence. Different authors have studied this phenomenon in depth, however, the influence of the variability of environmental parameters on rockburst potencial has not been studied in detail. This paper proposes to respond to this limit. More than 300 numerical models have been ran using Rs3 software to perform a sensitivity analysis of the main geomechanical parameters of the environment such as UCS, GSI, rock density and the elastic parameters (Young and Poisson’s modulus). Moreover, various depths have been considered to vary the in-situ stress. The Damage Initiation Spalling Limit (DISL) approach proposed by Diederichs (2007) has been considered to simulate the brittle failure of the rock mass and estimate the depth of failure around the excavation in all simulations. This work highlights the influence of the uniaxial compressive strength (UCS) and the in-situ stresses over the rest of the parameters. The elastic parameters of the rock mass do not influence excavation instability. Moreover, the GSI has no influence in our study. This can be explained knowing that small GSI values have been considered, according to “El teniente” mine, and therefore rockburst might not occur. To better understand the GSI influence on rockburst potential, its influence has been compared with Hoek & Brown failure criterion. Based on this work, a series of recommendation when simulating deep excavation is provided.

Copyright

© 2023 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - N. Ramirez
AU  - A. Delonca
PY  - 2023
DA  - 2023/11/08
TI  - Influence of Geotechnical Parameters and In-Situ Stresses on Strainburst Potential
BT  - Proceedings of the Rocscience International Conference  (RIC 2023)
PB  - Atlantis Press
SP  - 879
EP  - 886
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-258-3_82
DO  - 10.2991/978-94-6463-258-3_82
ID  - Ramirez2023
ER  -