论文部分内容阅读
在峰值后曲线段的岩层负载-变形关系曲线斜率比矿柱的负载-变形关系曲线斜率陡时,假定矿柱以稳定方式卸载的情况下,本文分析了矿柱的稳定性,论述了局部刚度、矿山结构刚度和临界刚度的概念。文中描述了用现有边界元计算饥程序确定不同矿柱布置时的岩层刚度的方法。根据与峰值后负载-变形关系和宽高比有关的数据,评价了矿柱的峰值后刚度。用岩层刚度与峰值后矿柱刚度的比较法进行了稳定性分析。分析表明,当跨度超过约5倍深度时,对于稳定的让压矿柱布置来说,岩层刚度变得太小。随着跨度与深度之比的减小以及矿柱个数和回采率的减小,岩层的刚度增大,从而提高稳定性。同时还发现,当某种布置的所有矿柱处在其峰值后负载-变形曲线的下降线段时,让压矿柱很难维持稳定。
When the slope of the load-deformation curve of the post-peak curve section is steeper than the slope of the load-deformation curve of the pillar, assuming that the pillar is unloaded in a stable manner, the stability of the pillar is analyzed in this paper. The local stiffness , Mine structure stiffness and critical stiffness concept. In this paper, the method of calculating the stiffness of rock strata when different pillars are arranged by using the existing boundary element method is described. Post-peak post-pillar stiffness was evaluated based on data related to post-peak load-deformation relationships and aspect ratios. The stability analysis of rock stiffness and post-peak pillar stiffness is carried out. The analysis shows that when the span exceeds about 5 times the depth, the formation rigidity becomes too small for a stable pillaring arrangement. As the ratio of span to depth decreases and the number of pillars and recovery rate decreases, the rigidity of the rock formation increases to improve the stability. It has also been found that it is difficult for the pillars to remain stable when all the pillars of a certain arrangement are at the descending section of their peak post load-deformation curve.