High in-situ stress can limit the generation of rock fractures induced by blasting, which usually shows different states of rock fragmentation with those under low-stress conditions. In this paper, the stress distribution around the blasthole under coupled in-situ stress and blasting load was theoretically analyzed. Then, the single-blasthole blasting process, which is calibrated by field blasting tests, was numerically investigated using the Riedel-Hiermaier-Thoma (RHT) model, and the effects of in-situ stress magnitudes and lateral pressure coefficients on the crushed zone and the crack propagation were investigated. After that, influences of lateral pressure coefficients, buried depths, and blasthole layouts on the behavior of double-blasthole blasting were studied. It is concluded that in-situ stresses can increase the compressive stress and reduce the tensile stress caused by blasting load. The area of the crushed zone decreases with increasing in-situ stresses. The crushed zone is elliptical in shape in anisotropic pressure conditions. The gap between the long axis and the short axis of the crushed zone widens as the difference between the stress in the horizontal and vertical directions increases. Cracks preferentially propagate in the higher stress direction. At a buried depth of 1000 m, connecting cracks can be formed at lateral pressure coefficients ranging from 0.25 to 3.0 when blastholes are drilled along the horizontal direction. The rise in buried depths and the angle between the centerline of adjacent blastholes and the higher stress direction can limit the formation of connecting cracks. The research results can provide guidance for analyzing the behavior of rock blasting in deep underground.

高地应力可以限制爆破引起的岩石破裂的产生，通常与低应力条件下的岩石碎裂状态不同。从理论上分析了爆破载荷作用下原位应力与爆破载荷共同作用下爆破孔周围的应力分布。然后，使用Riedel-Hiermaier-Thoma（RHT）模型对通过现场爆破测试校准的单爆孔爆破过程进行了数值研究，并研究了原位应力大小和侧向压力系数对破碎带和爆破区域的影响。研究了裂纹扩展。之后，研究了侧向压力系数，埋深和爆破孔布局对双爆破爆破性能的影响。得出的结论是，原地应力可以增加爆破载荷引起的压应力，降低张应力。压碎区的面积随原位应力的增加而减小。压碎区在各向异性压力条件下为椭圆形。随着水平方向和垂直方向上的应力之差增加，压碎区的长轴和短轴之间的间隙变大。裂纹优先在较高的应力方向上传播。在埋入深度为1000 m的情况下，沿水平方向钻爆孔时，横向压力系数在0.25到3.0范围内会形成连接裂纹。埋深的增加以及相邻爆破孔的中心线与较高应力方向之间的夹角会限制连接裂缝的形成。