动力扰动下深部高应力矿柱力学响应研究

对深部矿柱在承受高静载应力时的动力扰动力学模型进行应力波传播力学响应分析，采用FLAC^3D有限差分程序对深部开采圆形矿柱进行高应力下动力扰动数值计算。研究高径比为4的圆形矿柱在承受不同静载作用时对动力扰动的力学响应特性，通过改变矿柱所受静载应力的大小，来考察承压不同的矿柱对外界动力扰动的响应情况；通过改变扰动应力波峰值的大小，来考察动力扰动强度的变化对承受高应力矿柱稳定性的影响。矿柱的数值分析结果表明：承受高应力的岩体，随着所受初始静载应力的增大，外界的动力扰动对其影响就越明显；承受高静载应力的矿柱，较小的动力扰动可能会使其发生塑性破坏而导致深部开采时的“多米诺骨牌”效应。

STUDY ON MECHANICAL RESPONSE OF HIGHLY-STRESSED PILLARS IN DEEP MINING UNDER DYNAMIC DISTURBANCE

The mechanical response of highly-stressed pillars under the propagation of stress wave in deep mining is discussed by assuming that the pillars are disturbed by different peak values of dynamic stress. By using an explicit finite difference program FLAC^3D, a model of numerical calculation is established for a deep mining pillar with dynamic disturbance under high stress. A cylinder pillar with a ratio of 4 between height and diameter is studied in the numerical calculation processes. The dynamic response characters of the pillar are obtained by changing the preloaded static stress. And then the effect of disturbance intensity on the stability of highly-stressed pillars is reflected by changing the different peak value of the dynamic stress wave. Through the numerical analysis of the pillar in deep mining, it is found that the stability of high stress rock mass is more distinctly influenced by the outside dynamic disturbance with the original static stress increased. Especially when the pillar is endured very high static stress, even a small dynamic disturbance may lead to its plastic destroying and result in a domino effect in the deep mining.