The Research Of Attenuation Law Of Blasting Stress Wave In Cross Jointe Rocks

According to PFC2D discrete element software, blasting model of no jointed rock mass under the concentrated charge is established, obtaining the stress wave ‘s attenuation law in propagation process and compared with the theoretical value. In order to verify the model's adaptability, a group of blasting model of cross jointed rock is built, from which the stress peaks at different key points are analyzed to study the effect of the relative position relationship between cross joint and increment( including joint cross angle,distance between joint intersection and detonation point) on explosive stress wave attenuation. The simulation analysis shows that the relative position relationship between cross joint and detonation point have a great impact on propagation of stress waves and blasting funnel shape; When the stress wave propagate to cross joint position, there will be energy aggregation,superimposed phenomenon, resulting in the region's stress wave peak rise rapidly; The stress wave peak ratio presents a linear downward trend when the joint cross angle increases,but presents significant decreases and then increases followed stable trends as the distance increase from the detonation point; Over crossing joints, stress wave attenuation sharply,much smaller than the case of the absence of joints...