露天矿爆破荷载等效施加方式的探究

为了较为准确数值模拟爆破荷载的等效施加方式，基于强度折减法基本理论分析边坡稳定性，针对露天矿爆破开采时的特殊爆破荷载，提出了能够仿真模拟实际爆破荷载的等效加载方式。该等效加载方式首先对露天矿爆破荷载进行分析，爆破荷载是由爆源中心环向向四周传递，将爆破荷载等效加载到粉碎区外边界上，与实际的炮孔爆破荷载形式较为吻合；利用FLAC3D建立露天矿边坡数值模型，分析在爆破动载下边坡的动态响应特征，运用强度折减法计算得到露天矿边坡的动力安全系数。最后与以往将爆破振动施加到模型边界的等效施加方式进行对比，验证了此等效施加方式应用于爆破动载下露天矿边坡稳定性分析中的可行性与合理性。

Exploration for Open-pit Mine Blasting Load Equivalent Way

In order to obtain more accurate numerical simulation of blasting load equivalent way，based on the basic theory of strength subtraction analysis on slope stability，and aiming at special blasting load in the open-mine blasting，a equivalent loading method to accurately simulate the actual blasting load is proposed.Then，the equivalent loading method is used to analyze the open-pit mine blasting load.Blasting load is transmitted by the explosion source center to around，and the blasting load is equivalently loaded to the border of crush zone，which are more consistent with the actual hole blasting load.With FLAC3D software，the numerical model for open-pit mine slope is established to analyze the dynamic response of the slope under blasting dynamic load characteristics.With application of the strength subtraction，the dynamic safety factor of open-pit mine slope is calculated.Finally，through comparing with past equivalent method that imposes the blasting vibration to the boundary of the model，it is verified that this equivalent method applied to the slope stability analysis under blasting dynamic loading is feasible and rational.