We study the structural instability mechanism and effect of a multi-echelon support in very-deep roadways. We conduct a scale model test for analysing the structural failure mechanism and the effect of multi-echelon support of roadways under high horizontal stress. Mechanical bearing structures are classified according to their secondary stress distribution and the strength degradation of the s...

The failure of the roll during rolling process causes cobble to lose production time for several hours. Investigations include visual inspection, lltrasonic test, chemical analysis, metallography, and hardness measurement. Stand finishing F1-F4 uses High Chrome (HCr) material type, while F5-F6 ICDP type. Spalling work occurs on stand F5 with Roll Top position. was chipped between shell core an ...

This paper presents a numerical procedure for evaluating the thermo-mechanical response of Ultra-High Performance Concrete (UHPC) beams exposed to fire. The model is based on macroscopic finite element formulation and utilizes sectional moment-curvature relations trace UHPC from linear elastic stage collapse under combined effects fire structural loading. Fire-induced spalling, temperature-depe...