地应力对岩体爆破特征影响规律分析

为研究地应力对岩体爆破的影响，本文通过颗粒流软件（PFC2D）建立计算模型，进行数值模拟，从模型内部应力变化、裂纹分布、裂纹数量和能量场多个角度来分析爆破效果。结果表明：地应力严重影响岩体的爆破效果，尤其是压碎区，地应力每增长1 MPa，峰值应力就会大约增长26 MPa；地应力会抑制裂纹发育，对岩体裂纹分布状态和裂纹数量的抑制效果在3~6 MPa时最明显；地应力每增长1 MPa，岩体内部应变能会大约增长250 kJ；摩擦能和动能的能量变化峰值会随地应力的增加而稍微增加。

Analysis of the Influence Law of In-situ Stress on Blasting Characteristics Rock Mass

In order to study the influence of in-situ stresses on rock blasting, this paper established a calculation model by particle flow software(PFC2D), carried out numerical simulation, and analyzed the blasting effect from the internal stress change, crack distribution, crack number and energy field of the model. The results show that the in-situ stress seriously affects the blasting effect of rock mass, especially in the crushing area. The peak stress increases by about 26 MPa when the in-situ stress increases by 1 MPa; the in-situ stress can inhibit the crack growth, and the inhibition effect on the crack distribution and number of rock mass is most obvious at 3 ~ 6 MPa; when the in-situ stress increases by 1 MPa, the internal strain energy of rock mass will increase by about 250 kJ; The peak values of friction energy and kinetic energy increase slightly with the increase of in-situ stress.