Research On The Mechanics And Recognizable Technology Of Rock Burst In Open-Pit To Underground

The rock burst in underground engineering has the characteristics of sudden,transient and destructive,so its harm cannot be ignored.It can be said that researching on the mechanism,monitoring method and the identification technology of rock burst is of great significance.How to accurately grasp not only the evolution mechanism of stress and energy but also determining the danger zone of surrounding rock under the action of underground excavation disturbance is the precondition of ensuring safety in production.Based on the mining data and monitoring data of ground pressure,the evolution mechanism of stress and energy,the dangerous area of mining in underground mining have been deeply studied.Then,the ground pressure of remote monitoring and early warning system of Xingshan mine has been established.Based on the best dimension principle,a combined forecasting model for the data of ground pressure monitoring has been built.The main achievements obtained in the dissertation are:(1)Based on the existing data,the stress and deformation mechanism of surrounding rock are studied.According to geological data of Xingshan mine and elastic performance indicators,the impact proneness has been analyzed.Based on the theory of critical stress of surrounding rock and the principle of minimum energy,the stress and energy criterion of rock burst has been built.(2)Combined with the practical situation of engineering and mine plan,C19 prospecting line has been chosen to establish a model by numerical simulation.And failure mechanism of surrounding rock in Xingshan mine under different mining conditions has been studied by analyzing the stress and energy evolution characteristics of the surrounding rock.(3)3D terrain model and 3D numerical model have been built by ArcGIS and numeral simulation software.According to studying the characteristics of surrounding rock stress and energy distribution in ore body excavation,the dangerous area of rock burst is established.The mining process is optimized,and it proves that adjusting the recovery process is conducive to reducing the stress concentration and energy accumulation of the surrounding rock,and reducing the possibility of occurrence of rock burst.(4)Based on the results of 3D numerical simulation and engineering practice,the remote ground pressure monitoring system of Xingshan Mine has been established.What is more,the monitoring scheme of mining stress and displacement has been put forward.The results show that this monitoring program not only saves costs,but also can be a preliminary warning of ground pressure,and it is of great significance for the safety of mine production.(5)According to the mine stress monitoring data,the Matlab program is compiled.The optimal dimension of the single prediction model is determined by different dimension modeling.According to the least squares principle,the combination coefficient between individual predictions is obtained,and the combined forecasting model is established based on optimal dimension.Then,the trend of subsequent stress change is studied by using the combined forecasting method.The error analysis of the prediction results shows that the combined forecasting model based on the best dimension has higher prediction accuracy.