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Numerical Analysis of Unloading-Induced Rock Failure: Insight into Strainburst Mechanism
Abstract In this technical note, the rock failure process analysis software RFPA2D was used to reproduce unloading-induced brittle failure. Especially, the approach aims to investigate the mechanism and the failure mode of unloading-induced rock failure. Two tunnel excavation models were built to conduct the numerical simulation. Failure characteristic of a single-stage excavation under unloading exhibits a very brittle failure behavior and a sudden and intense energy release. The predominant failure mode is spalling, further developing some local shear failures, with fractures approximately parallel to the excavation boundary. The failure mode of multiple-stage excavation is predominantly shear failure with some local tensile failures. The energy release rates in a single-stage excavation and multiple-stage excavation are compared simultaneously after the unloading, the total energy and the releasable strain energy for the case of a single-stage excavation are much higher than that for multiple-stage excavation. This note presents the rock failure intensity and the damage mode significantly, with satisfactory results.
Numerical Analysis of Unloading-Induced Rock Failure: Insight into Strainburst Mechanism
Abstract In this technical note, the rock failure process analysis software RFPA2D was used to reproduce unloading-induced brittle failure. Especially, the approach aims to investigate the mechanism and the failure mode of unloading-induced rock failure. Two tunnel excavation models were built to conduct the numerical simulation. Failure characteristic of a single-stage excavation under unloading exhibits a very brittle failure behavior and a sudden and intense energy release. The predominant failure mode is spalling, further developing some local shear failures, with fractures approximately parallel to the excavation boundary. The failure mode of multiple-stage excavation is predominantly shear failure with some local tensile failures. The energy release rates in a single-stage excavation and multiple-stage excavation are compared simultaneously after the unloading, the total energy and the releasable strain energy for the case of a single-stage excavation are much higher than that for multiple-stage excavation. This note presents the rock failure intensity and the damage mode significantly, with satisfactory results.
Numerical Analysis of Unloading-Induced Rock Failure: Insight into Strainburst Mechanism
Huang, Zhiping (author) / Tang, Chun’an (author) / Cai, Ming (author)
Indian Geotechnical Journal ; 48 ; 558-563
2017-08-17
6 pages
Article (Journal)
Electronic Resource
English
Numerical Analysis of Unloading-Induced Rock Failure: Insight into Strainburst Mechanism
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