Study on the influence of stress difference and joint angle on rock mass damage caused by hydraulic blasting
In order to study the influence of stress difference and joint angle on the effect of hydraulic blasting rock,on the basis of analyzing the transmission and reflection mechanism of hydraulic blasting stress waves in rock mass,ANSYS/LS-DYNA numerical simulation software was used to study the propagation process,distribution characteristics and rock damage range of hydraulic blasting fracture under different stress difference and joint angle conditions.The results show that the stress difference has a significant effect on the damage area of the rock mass,and the effect on the nonlinear failure area is significantly greater than that on the crushed area.Under certain conditions of joint angle,the opening angle of the wing crack increases with the increase of the main stress difference;The joint angle has a direct impact on the superposition effect of stress incident waves and reflected waves,resulting in changes in the length and expansion direction of the wing crack,and the damage range of the layer crack area.When the joint angle is 90°,the damage of the rock mass outside the joint is the smallest,but the damage of theinner layer fracture area is serious,and with the reduction of the joint angle,the damage of the layer fracture area decreases,the length of the wing crack increases,and the penetrating crack gradually extends along the joint direction,until the joint angle is reduced to 0°,the damage of the laminar fracture area is minimized,and the wing crack and the penetrating crack coincide.
万方数据
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