Coal Burst Mechanism and Modelling : Report Writing - Engineering Assignment

Internal Code - MAS411

Engineering Assignment

Report Writing The project title is "Coal burst mechanism and modelling". I need to submit a initial report for the same on . It should be of at least 5000 words. Please find the attached files of some journals based on coal burst. Coal Burst Mechanism and Model - It is elementary but important to illustrate that an underground excavation initiates a process of re- equilibrium, which leads to the generation of stresses around the excavation in a manner that free surfaces become planes for principal stresses and experience a bi-axial state of stress condition. The excavation boundaries may experience damage effects due to stresses and these effects for coal mines can be dislocation of rock reinforcement, interbed crossover of laminated roof rock mass, cutter failure, floor heave and/or rockburst/coal bump (Fig 1). These damaging effects are presented in the order of their severity according to the stress level, corresponding strength (uniaxial and poly-axial) at the point of consideration of the stress loading. Excess of the stress level in comparison to the strength and the rate at which the excess is attained during the re-equilibrium process is manifested into the different damaging effects as illustrated in Figure 1. A faster rate in obtaining excess stresses will result into rockburst/coal bump. Occurrence of this excess stress over a greater area will increase the severity of the damaging effects. Further, part of the excavation experiences stress concentration and another experiences stress relaxation due to the shape of the opening and in situ stress directions.