A stability study of goaf based on mechanical properties degradation of rock caused by rheological and disturbing loads

Based on the classical static theory and static numerical simulation, the static method could not accurately reflect the stability of goaf where the rocks on the pillar and roof are influenced by rheological and blasting disturbance for a long time. According to the test from the site, an experimental study was made in rheological and dynamic disturbance. After that, on the basis of variable rock mechanics parameters from the experimental data, numerical simulation was used to analyze the vertical stress distribution of goaf, vertical displacement and plastic area of roof in the “deterioration” caused by rheological and blasting, which shows that the mechanics properties of the rock were greatly influenced by rheological, and dynamic disturbance. The results of the experimental study and numerical simulation show that the mechanics properties of rock are greatly influenced by rheological and dynamic disturbance. As a result, the stability of goaf is greatly reduced. Finally, by comparing golf monitoring results with the analysis of theoretical calculation, it was found that the results were approximately the same, which testifies the reliability of the method. This method provides a new way of studying the stability of goaf as well as laying a basic foundation for future safety management.