THE THERMO-MECHANICAL COUPLED ANALYSIS OF FIRE INDUCED DAMAGE FOR UNDERGROUND MINES WITH VARIOUS GEOMECHANICAL DOMAINS

Date

2025-6

Author

Abduljabar, Alak Abdulsatar Abduljabar

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Mine fires pose a serious threat to the stability of underground excavations due to complex thermo-mechanical effects on the surrounding rock mass. Understanding the fire-induced damage requires coupled thermo-mechanical assessments and mechanical outcomes are dependent on the geomechanical conditions. Accordingly, this study models the fire-induced damage zone (FIDZ) around a typical underground mine haul road for three different rock mass quality classes representing hard rocks to observe their response to increasing temperatures. The mechanical effects were quantified while changing the scale of the fire and the support configurations. Numerical results show that the damage initiated earlier in lower geomechanical settings. In high quality rocks, the FIDZ concentrates mainly around the crown and sharp edges, while in lower qualities the region extends further to the walls and floor, and the damage zone becomes more uniform around the opening. The presence of excavations above and below the fire zone was observed to influence the progression of the damage. The tension between the bolts and excavation boundary is affected by fire, resulting in bolt failure between 500°C and 900°C. Experimental remarks showed a temporary increase in strength and stiffness up to 400°C and degradation started only after these levels. In this perspective, classical material constitutive models are questioned in terms of lacking to represent the dependency of mechanical parameters to the temperature change.

Subject Keywords

Underground Mine Fire, Fire Induced Damage, Coupled Geomechanical Simulation

URI

https://hdl.handle.net/11511/115189

Collections

Graduate School of Natural and Applied Sciences, Thesis