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根据岩石脆性破坏的本构方程和三维重整化理论,推导出了岩石破裂前声发射信号激增的临界点所对应的应力和岩石峰值应力比值的数学表达式。通过测试深部紫红色砂岩单轴加载变形破裂全过程中力学与声发射特征,得到了全过程力学特征曲线、声发射能量累计数等相关数,发现岩石破裂前声发射突增点所对应的应力与岩石临界点相对应。单轴刚性加载条件下岩石脆性破裂前声发射突增点所对应的应力与峰值应力比值大部分近似在74%左右,误差在±9%以内。
According to the constitutive equation and three-dimensional reconstruction theory of brittle failure of rock, the mathematical expression of the ratio of stress and rock peak stress corresponding to the critical point of acoustic emission signal explosion before rock burst is deduced. By testing the mechanics and acoustic emission characteristics during the whole process of uniaxial deformation and rupture of purple magenta sandstone, the correlation curves of mechanics characteristic curve and cumulative energy of acoustic emission were obtained, and the stress corresponding to the sudden increase of acoustic emission before the rock burst was found Corresponds to the rock’s critical point. Under uniaxial rigid loading, the ratio of stress to peak stress corresponding to the sudden increase of acoustic emission before rock brittle fracture is mostly about 74% with the error within ± 9%.