基于统计损伤的岩爆预测

基于岩石单轴抗压强度的分布特征,对脆性岩石采用统计损伤的平行杆模型模拟,经岩石全过程曲线拟合,表明了 模型的合理性。进而提出采用平行杆模型模拟地下深埋洞室脆性围岩,推出了不同应力条件下岩体损伤的表达式,从统计损 伤的概念上,利用损伤变量来表征岩爆发生概率。工程实例分析表明该预测方法是有效的。

PROBABILITY PREDICTION OF ROCKBURSTS BASED ON STATISTICAL DAMAGE MECHANICS

Based on the probability distribution of the uniaxial compressive strength of the rock, the authors present a parallel-pole model of statistical damage to simulate the brittle rock. The calculated stress-strain relationship based on the statistic damage matches well with test results. The parallel-pole model was then used to simulate the surrounding rockmass of a tunnel. The damage variables were derived for different stress conditions. From the concept of statistic damage, the damage variables represent probability of rockbursting.