Rockburst Characteristics Of Deep Tunnel And Monitoring And Early Warning Of Microseismic

With the continuous development of China's economic construction and the increasing demand for natural resources,engineering construction and resource development are gradually developing to the deep underground.Rockburst,as a geological hazard,poses a growing threat to the safety of construction personnel and equipment with the gradual increase of construction depth.It is of great significance for site safety to carry out research on rockburst problems in deep underground engineering and to understand the causes and incubation process of rockburst.The cited han dhi nutrient-laden engineering in qinling tunnel the mountains paragraph # 5 hole as the engineering background,analyzes the macro performance characteristics of rock burst,strong seismic activity and the rock burst is studied in time and space distribution characteristics of correlation,based on the micro cracks in rock the whole stress strain curve characteristics,along with the change of rock damage to extract the seismic system in each stage of the warning characterization,aimed at the scene early warning method of rock burst is established.The main research contents are as follows:(1)Based on field investigation and rockburst recorded data,The influencing factors and macroscopic characteristics of rock burst are studied.The effects of burial depth and excavation rate on rock burst,the axial and radial distribution characteristics of rock burst,the types of rock burst and the relationship between structure surface and rock burst strength are analyzed.(2)Based on the principle of microseismic monitoring equipment,combined with the construction characteristics of deep buried tunnels,a working system suitable for underground engineering is established on the premise of ensuring the safe and effective operation of the equipment,and real-time continuous monitoring of on-site rockbursts is achieved.(3)Based on the microseismic monitoring data,the relationship between the microseismic activity and the spatial-temporal intensity distribution characteristics of rockbursts was studied.The corresponding change law of microseismic activity and rock mass disturbance over time,the relationship between the location change and concentration degree of microseismic event and rock burst,the relationship between rock burst grade and energy release and event magnitude are analyzed.and an empirical determination method for rockburst strength based on energy per unit time microseismic event was established.(4)Based on the study of the correlation between microseismic characteristics and the rockburst incubation process,combined with the characteristics of microcracks in each stage of the rock's full stress-strain curve,the response law of microseismic information in each stage of the change is analyzed,and a comprehensive early warning methods of rockbursts on site is established.