岩石脆性破坏表征与Weibull分布适用范围

发布时间：2018-07-10 08:28

本文选题：脆性破坏 + 脆性指标　；参考：《地球物理学进展》2017年05期

【摘要】：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].
[Abstract]:Understanding the brittle failure behavior of rock is of great significance to the study of geological hazard prediction, tunnel safe tunneling and oil and gas reservoir reconstruction. In view of the shortcomings of past definitions of brittle failure, It is considered that the fracture caused by crack initiation and propagation is more rigorous. Weibull distribution shape parameter m can comprehensively characterize the mechanical response characteristics of rock under the action of heterogeneity and external environment, and its numerical value is easy to measure. It can be used as an index to measure the degree of brittle failure. Based on the weakest ring principle of Weibull distribution, it is pointed out that when the Weibull distribution is used to describe the brittle failure behavior of rock and natural locking section, the reasonable range of parameter m is [1.0 ~ 6.0] and [1.0 ~ 4.0], respectively.
【作者单位】：中国科学院地质与地球物理研究所中国科学院页岩气与地质工程重点实验室;中国科学院大学;北京工业大学城市与工程安全减灾省部共建教育部重点试验室;
【基金】：国家自然科学基金项目(41572311,41302233) 中国科学院战略性先导科技专项(B类)(XDB10030302)联合资助
【分类号】：P584;TU45

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