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理解岩石脆性破坏行为,对研究地质灾害预测、隧道安全掘进和油气储层改造等问题具有重要意义.鉴于过去关于脆性破坏的定义存在缺陷,我们认为将其定义为主要由裂纹萌生与扩展导致的破坏较为严谨.Weibull分布形状参数m可综合表征岩石的非均质性与外部环境条件作用下岩石的力学响应特征,且其数值容易测量,可作为衡量脆性破坏程度的指标.从Weibull分布的最弱环原理出发,指出该分布用于描述岩石和天然锁固段脆性破坏行为时,参数m的合理取值范围分别为[1.0,6.0)和[1.0,4.0].
Understanding the brittle failure of rock is of great significance to the study of the prediction of geological disasters, tunneling safety and the reconstruction of oil and gas reservoirs, etc. In view of the shortcomings of the definition of brittle failure in the past, we consider it to be mainly caused by the initiation and propagation of cracks Weibull distribution shape parameter m can comprehensively characterize the mechanical response of rock under the influence of rock heterogeneity and external environmental conditions, and its value can be easily measured, which can be used as an indicator of the degree of brittle failure.From the Weibull distribution According to the weak-ring principle, the distribution of this parameter is used to describe the brittle failure behavior of rock and natural locking segments. The reasonable range of parameter m is [1.0, 6.0] and [1.0, 4.0] respectively.