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利用有限差分程序FLAC建立连续和并排的两类非均质矿柱模型,对矿柱在动力载荷循环作用下的破坏过程进行全时程动力分析。将加卸载响应比(LURR)理论引入矿柱动力稳定性分析中,以施加的动力载荷对矿柱作用的周期性变化作为加载量,以矿柱特征点的位移变化和破坏单元的弹性应变能的演化规律作为响应参数,建立矿柱的加卸载响应比模型,确定矿柱在动力载荷作用期间的加卸载响应比时间序列。计算结果表明,矿柱整体上处于稳定状态和趋于失稳时,其加卸载响应比Y值表现出不同的特征,通过对Y值的分析对矿柱的稳定状态进行评价,预测是否临近峰值承载能力,表明在矿柱动力破裂过程数值模拟分析中引入加卸载响应比是矿柱破坏力学行为研究的一种方便而有效的方法。
Two types of continuous and side-by-side non-uniform pillars model are established by finite difference program FLAC, and full-time dynamic analysis is carried out on the failure process of pillars under dynamic load cycle. The LURR theory is introduced into the dynamic stability analysis of pillars. The cyclic changes of the pillars acting on the dynamic loads are taken as the loadings, and the displacement of the characteristic points of the pillars and the elastic strain energy As the response parameter, the loading / unloading response ratio model of ore pillar was established and the time series of loading and unloading response ratio of pillar during dynamic load was determined. The calculation results show that when the ore column is in a steady state and destabilizing as a whole, the loading-unloading response shows different characteristics than the Y value. By analyzing the Y value, the steady state of the ore pillar is evaluated to predict whether the peak is near The results show that introducing loading-unloading response ratio in the numerical simulation analysis of ore pillar during the dynamic fracture process is a convenient and effective method to study the failure behavior of pillar.