To investigate the deterioration of mechanical properties in engineering rock masses subjected to fatigue stress,this study conducted laboratory tests, theoretical analysis, and model building to analyze the evolution...To investigate the deterioration of mechanical properties in engineering rock masses subjected to fatigue stress,this study conducted laboratory tests, theoretical analysis, and model building to analyze the evolution of mechanical and rockburst characteristics in gypsum-like rock before and after fatigue loading. The results showedthat the effects of cyclic stress and loading frequency on fatigue damage characteristics of the samples areinterrelated. The effect of fatigue cyclic stress on the mechanical parameters and rockburst parameters of thesamples after fatigue loading is relatively straightforward, while the impact of frequency on the mechanicalproperties of samples after fatigue loading is more complex. The impact of frequency on mechanical propertiesand rockburst parameters varies distinctly under different cyclic stress conditions. A deterioration index model(λ=p+jq) was established for the samples after fatigue loading, and the real part, imaginary part, and jλj of themodel were calculated to plot the function in the complex plane. This model provided insight into the evolution ofmechanical properties and rockburst characteristics in gypsum-like rock before and after fatigue loading withdifferent stress levels and frequencies. By examining the λ curve’s position within the complex plane, the overallvariation in mechanical properties was assessed. Finally, neural network methods were employed to extend andtest the complex plane model, expanding the input factors from discrete data points to continuous definition fieldson the number line, thereby increasing the model's practicality and applicability.展开更多
基金supported by Scientific Research Foundation of State Key Lab of Coal Mine Disaster Dynamics and Control(Project Approval Number:2011DA105287-zd201804)National Natural Science Foundation of China(No.51974104)。
文摘To investigate the deterioration of mechanical properties in engineering rock masses subjected to fatigue stress,this study conducted laboratory tests, theoretical analysis, and model building to analyze the evolution of mechanical and rockburst characteristics in gypsum-like rock before and after fatigue loading. The results showedthat the effects of cyclic stress and loading frequency on fatigue damage characteristics of the samples areinterrelated. The effect of fatigue cyclic stress on the mechanical parameters and rockburst parameters of thesamples after fatigue loading is relatively straightforward, while the impact of frequency on the mechanicalproperties of samples after fatigue loading is more complex. The impact of frequency on mechanical propertiesand rockburst parameters varies distinctly under different cyclic stress conditions. A deterioration index model(λ=p+jq) was established for the samples after fatigue loading, and the real part, imaginary part, and jλj of themodel were calculated to plot the function in the complex plane. This model provided insight into the evolution ofmechanical properties and rockburst characteristics in gypsum-like rock before and after fatigue loading withdifferent stress levels and frequencies. By examining the λ curve’s position within the complex plane, the overallvariation in mechanical properties was assessed. Finally, neural network methods were employed to extend andtest the complex plane model, expanding the input factors from discrete data points to continuous definition fieldson the number line, thereby increasing the model's practicality and applicability.
