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基于矿柱多为剪切破坏的特征,提出了矿柱抗剪安全系数的概念,研究了数值计算中矿柱失稳的判据,即以矿柱破裂面上节点的塑性应变或位移突变作为矿柱整体失稳的标志.采用有限元强度折减法计算了矿柱的抗剪安全系数,通过与传统方法所得安全系数的分析比较,提出判断矿柱稳定性的抗剪安全系数标准,即当矿柱的抗剪安全系数大于1.2,此时传统的抗压安全系数大于2.6,矿柱是安全可靠的.
Based on the fact that the pillars are mostly shear failure, the concept of shear safety factor of pillars is proposed. The criterion of instability of pillars in numerical calculation is studied. The plastic strain or displacement mutation of the pillars on the rupture surface of pillars is taken as The overall instability of the pillar is a sign of the strength of the pillars shear safety factor calculated by the strength reduction method of finite element analysis and comparison with the safety factor obtained by the traditional method proposed to determine the stability of the pillars shear safety factor standard, Shear safety factor of shear greater than 1.2, this time the traditional anti-stress safety factor greater than 2.6, pillar is safe and reliable.