Study On Vibration Attenuation Law And Cumulative Damage Effect Of Tunnel Surrounding Rock Under Cyclic Blasting

In the process of tunnel blasting,it will inevitably cause vibration and damage to the rock mass,which will lead to the deterioration of the mechanical properties of the rock.In this article,the vibration and damage laws were studied with the engineering background of the Xingushan tunnel blasting in Fuping railway.First of all,using ANSYS/LS-DYNA numerical software simulation results show that under the action of blasting,the arch and arch position of the same tunnel section are affected greatly,which provides some guidance for the field of vibration.the attenuation law of the particle peak vibration velocity and the main vibration frequency of the rock mass is studied by the field vibration test,and the attenuation law of the two is accorded with the actual conditions;The two sound wave test method,the cumulative damage effect of tunnel surrounding rock in the three sections of the circular blast loads were tested,the measured results show the most serious and the vertical section of the tunnel face damage,through the diagonal line test accord with engineering requirements;and the nonlinear relationship between the number of blasting and rock damage degree regression analysis was carried out using polynomial,because the high-order coefficient tends to zero gradually in the process of regression,the regression using three order polynomial regression analysis of the 8,the lowest correlation coefficient was 0.9487,with high reliability.