爆破地震波在岩石介质中传播特性与数值计算研究

通过从不同角度对大量的深孔爆破地震动测试数据的分析 ,得到了岩石中爆破地震波传播的频率、幅值和持续时间等主要参数的变化规律以及它们的影响因素 ,并通过二元回归法 ,拟合出计算爆破地震波加速度幅值的经验公式。在此基础上 ,建立了爆破地震波传播过程的计算模型 ,编制了有限元计算程序。数值模拟仅考虑弹性区域 ,爆炸波对岩石介质的作用经粉碎区、破裂区衰减后成为输入荷载。计算结果与实测结果基本相符 ,证明该模型与方法可用于一般岩石介质中爆破地震波传播的数值模拟。研究结果为深孔爆破地震控制措施的制订提供了依据 ,对其它类似问题的研究也有一定的参考作用

STUDY ON PROPAGATION CHARACTERISTICS OF BLASTING SEISMIC WAVES IN A ROCK MEDIUM AND NUMERICAL CALCULATION

Through analyzing a lot of tested data of seismic waves from deep hole blastings at a different angle, the changing rules and influence factors of such main parameters as frequency, amplitude and lasting time of blasting seismic waves propagating in a rock medium are obtained, and the empiral formulas for calculating the amplitude of blasting seismic wave acceleration are fitted out by binary regression. On this basis, a calculation model for propagating process of blasting seismic waves and a FEM program have been established. In numerical simulation, the elastic zone is only considered and the effect of blasting waves on the rock medium, after attenuating through crushing zone and ruptured zone, becomes an input load. The calculated data are basically agree with the tested data, which has proved that the model and method can be used for the numerical simulation of propagating process of blasting seismic waves in general rock medium. The study results have provided not only the basis for the establishment of controlling measures of deep hole blasting vibration, but also the reference for the study of similar issures.