Energy Evolution in Deep - Buried Roadway upon Excavation
Journal of Engineering Science and Technology Review
Energy evolution is a key factor to catastrophe during an excavation of deep rock mass. Existing energy analysis methods are only limited to changes in elastic strain energies before and after the excavation. These methods neglect energy concentration and energy dissipation characteristics of rock units during the excavation. This study aims to investigate energy evolution and redistribution laws in surrounding rock mass caused by excavation of deep-buried roadway. Thus, a numerical calculation
... of total strain energy, elastic strain energy, dissipated energy, energy concentration efficiency, and energy dissipation efficiency of surrounding rock mass was conducted in a deep-buried roadway of Linglong Gold Mine in Shandong Province, China. Energy concentration, accumulation and dissipation characteristics, and energy accumulation and dissipation efficiency of rock units upon excavation in the deep-buried roadway were explored through a contrastive analysis of the distribution of these energy indexes. Results demonstrate that the influence depth of radial excavation disturbance of this roadway is 5 times the roadway diameter (15 m), and the axial influence depth is approximately 3 times the roadway diameter (10 m). The energy dissipation efficiencies from the sidewall to the corner of the roadway are relatively high at 96% and 57%. The roof and floor of the roadway are stable given the relatively high energy accumulation efficiency, 95% and 67% respectively. The location of rockburst in the engineering field observation conforms to the high energy dissipation of rock units in the numerical calculation. Therefore, the constructed energy analysis method is effective and promising. The conclusions provide reasonable guidance to the stability of deepburied roadways and rockburst predictions.