边坡爆破高度对边坡稳定性的影响

为了解爆破后由急倾斜且具有水平裂隙发育岩体组成的边坡稳定性及其内部破坏规律,最终总结出爆破高度对边坡稳定性的影响特征,使用基于颗粒流理论的PFC3D进行该工况模拟。利用PFC3D中的JSET和Bonds模拟非连续和连续性的岩体构造形式,以对实际的岩体中岩块和裂隙发育进行模拟。针对存在该类型构造发育边坡的实际工况,设置了13个爆破点的6个爆破方案进行模拟。研究了模拟结果表现出的边坡内部裂隙和位移随爆破高度的变化规律。其表明了对于同时起爆各爆破点而言,爆破高度越高爆破后边坡越稳定的结论,并分析了出现该现象的原因。说明了结论的普适性,同时该边坡实际的爆破情况也支持了该结论。

Simulated study on the influence of the slope blasting height on the slope stability

The paper is inclined to make a simulated study in hoping to identify the regularity and clarify the slope stability after the slope being exploded with a steep inclined seam or horizontal fracture,based on PFC3D of particle flying theory.In the paper,we have also analyzed and summarized the influential characteristics of the blasting height on the slope stability.To achieve the said purpose,we have also simulated the evolutionary law of continuity and discontinuity of the rock mass structure with the JSET and Bonds in PFC3D to imitate the development of rock mass and fracture in the actual rock mass.In doing so,we have simulated the actual working conditions of the said slope by using 6 blasting schemes on the 13 blasting spots.Thus,the results of our simulated study show the evolutionary regularity of the slope internal cracks and displacement in the regard to the blasting height.What is more,we have also made clear the morphological characteristics of the slope under the given geological condition.First of all,we have found that,in the explosion affected zone,the damage and the collapse of the rock mass would make the affected rock mass slide linearly along the structural surface,with the rock blocks sliding on the left side of the impact zone broken and dump outwards.Secondly,the overlying rock tends to slope outwards off the dump,because the overlying rock slope tends to lose its own original constraint,and then to split outwards off the rock slope.Furthermore,remarkable cracks would have cropped up in the structural plane.Hence,for all the simultaneous ignited burst points,the higher the blasting height,the greater the stability of the slope.On the other hand,the lower the blasting height,the greater the pressure of the overlying rock mass of the blasting zone.Moreover,the greater the dumping force of the slope,the bigger the inside cracks would be resulted.As a result,the higher the blasting height,the greater the pressure would be produced and the greater stability the slope would be formed in its surface.The conclusion here we have made may account for the actual situations of the slope blasting.