Study On The Accumulative Damage Of Rock Mass Excavation Under The Action Of Multiple Blasting

Blasting is a highly efficient and fast method for mine excavation or construction of tunnel engineering. But the instability of rock mass induced by blasting vibration seriously threatens the safety of engineers, especially for the mining drivage, and multiple blasting vibration damage to the rock mass will continuously cumulative. When it goes beyond the rock stresses, the mechanical property of rock mass will reduce or destroy, even causes rock burst in the serious area. So, it is meaningful to study the effect that repeatedly blasting vibration on the cumulative damage. On the basis of blasting theories, combining with the blasting damage model, researchers have emphatically discussed the concrete damage process of rock under the action of blasting impact load. It laid a theoretical foundation for the roadway surrounding rock under the action of multiple blasting cumulative damage effect, meanwhile, we used single-hole acoustic tester and geological radar to complete 10 times blasting production tests in Luling Mine. And tested how the blasting vibration effect on the acoustic wave velocity of rock mass, detected the changes of each blasting internal crack of surrounding rock by geological radar nondestructive testing method. Exploring the relationship of rock blasting cumulative damage effect and the times of blasting based on the field test data. And making use of the software LS-DYNA simulated the damage of multiple blasting vibration and the formation process of rock blasting crack. From macroscopic and microscopic view, researchers jointly explored how the multiple blasting vibration affects the cumulative damage of rock mass. This paper closely combined with the field of blasting operation in Luling mine, based on the theory, used the field measurement and numerical simulation do corresponding researches on the effect of blasting vibration cumulative damage of rock mass, providing a certain reference to further study the cumulative damage of rock mass and rock supporting on site.