Numerical simulation of the effect of eccentric decoupling coefficient on blasting crack
In order to explore the optimal decoupling coefficient of eccentric decoupled blasting rockmass,six sets of single-hole two-dimensional ANSYS/LS-DYNA models are established to analyze the damage effects of PK constitutive rock under eccentric uncoupled blasting loads.The results show that:① With the increase of the eccentric decoupling coefficient,the radius of the crushing zone on the decoupled side decreases significantly first and then slowly,while the coupled side increases rapidly first and then slowly decreases.On the decoupled side,the fracture extension length decreases slightly at first,then increases slowly and then decreases significantly,while on the coupled side,the fracture extension length remains unchanged.The peak particle vibration velocity increases significantly at 20 cm distance from the decoupled side.② When the decoupling coefficient is unchanged,the larger the rock strength,the longer the fracture extension length,and the shorter the vice versa.When the decoupling coefficient k=1.7,the rock with different strength under eccentric blasting load can achieve the smallest fracture radius of the decoupled side and the larger coupling side,the few cracks on the decoupled side and the more developed coupling side,effectively reducing the blasting effect of the rock in the non-blasting area,which is the optimal eccentric decoupling coefficient.
万方数据
维普
