【摘要】 为了研究爆破地震波在含结构面岩体中的传播规律,以大冶铁矿爆破开采工程为依托,基于动力有限元数值模拟分析了深孔爆破的荷载特性,建立了坡角为50°的含单条顺层结构面岩质边坡,分别分析了采矿深度、结构面刚度和结构面倾角对坡面质点峰值振动速度分布特征的影响。结果表明:结构面的存在对爆破地震波的传播规律有显著的影响,但采矿深度的影响相对较小;结构面法向刚度的增大在一定范围内能显著提高爆破地震波的透射效应;切向刚度和结构面倾角的影响相对较复杂。更多还原

【Abstract】 In order to study the propagation law of blasting seismic waves in rock mass with structural planes, the characteristics of blasting loads is analyzed based on the dynamic finite elements method in the background of the blasting exploration in Daye iron mine. A rock slope with an out-dipped structural plane at a 50 degree angle is established, and the influence of mining depth, the stiffness and the dip angle of structural plane on the distribution of blasting vibrations is analyzed. Results show that the existence of structural plane exerts an obvious influence on the propagation of blasting seismic waves, while the influence of mining depth is comparatively less. The increase of normal stiffness can remarkably boost the transmission of blasting seismic waves, while the influence of shear stiffness and dip angle of structural plane is more complex.更多还原