Analysis Of In-situ Stress Characteristics And Prediction Of Rockburst In Deep Buried Tunnel

The in-situ stress field is one of the important geological conditions for underground engineering such as deep tunnel.Under the condition of deep buried high stress,the possibility of rock burst in hard brittle rock is higher,and it is easy to cause great harm.In this paper,the stress distribution of the whole project area is obtained by the stress test and the regression analysis of the stress field.On this basis,the Futang tunnel rock burst disaster as the research background,the integrated use of theoretical analysis,laboratory experiment and numerical simulation,studied different lateral pressure coefficients and the maximum horizontal principal stress correlation between different angle and rock burst stress and the tunnel axis.Finally,combined with the classical criteria of rock burst,rock burst prediction along the Fu Tong tunnel is carried out,and the control effect of rock bolt blasting is analyzed.The main contents of this paper are as follows:1.The intersection of three hydraulic fracturing method of deep buried tunnel carried out in-situ stress test,based on the measured geostress data,combined with geological information engineering tunnel,the tunnel stress field regression analysis,obtained the stress distribution within the project area.2.Based on the results of brittle rock mass strength failure criterion and indoor rock mechanics test,the numerical simulation analysis of the accumulation depth specific stress conditions induced by rock burst occurrence of elastic strain energy,and the effects of different lateral pressure coefficient and maximum horizontal correlation between stress and the tunnel axis is not the same between angle and rock burst.3.According to the coefficient of lateral pressure and the maximum horizontal principal stress and the tunnel axis angle of rock burst,combined with the classic rock burst criterion of tunnel rock burst prone sections along the wall and prone position were predicted and studied the shotcrete supporting rock burst prevention effect.