Generalized fracturing activation criteria
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摘要:
岩石破裂及其后续活动是最基本的构造变形方式，然而，经典的破裂准则（Coulomb-Mohr准则、Griffith准则和以Byerlee律为代表的滑动摩擦律）在实际应用中存在不同方面的局限。文章在经典破裂准则的基础上，从产生破裂（扩张破裂和剪切破裂）的物理本质出发，结合广义剪切活动准则和长期的研究实践，通过理论分析，提出了“广义破裂活动准则”。该准则用统一的无量纲因子（破裂活动趋势因子）来表达扩张破裂活动和剪切破裂活动，可以用来定量判断任意介质、在任意三轴应力状态下、任意方位界面（包括先存薄弱面和非薄弱面）发生破裂活动的可能性以及破裂的类型，把Coulomb-Mohr准则、Byerlee律和Griffith准则统一起来，将破裂（fracturing）扩展到破裂活动（fracturing activity）。该准则在与破裂活动相关的资源勘探开发（如页岩气、干热岩等）、灾害（如地震与滑坡等）预测和防治中具有广阔的应用前景。
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关键词:
- 破裂 /
- 破裂活动 /
- 先存构造 /
- Coulomb-Mohr准则 /
- Byerlee律 /
- Griffith准则 /
- 广义破裂活动准则
Abstract:Objective Rock fracturing and its subsequent activations are the most basic tectonic deformation modes. However, the classical fracturing criteria (Coulomb-Mohr criterion, Griffith criterion, and Byerlee sliding-friction law) have different limitations in practical applications.
Methods Based on the classical fracturing criteria and the analysis of the physical nature of fracturing generation (extensional fracturing and shear fracturing), combined with the generalized shear activation criterion and long-term research practice, a "generalized fracturing activation criterion" is proposed through theoretical analysis in this paper.
Conclusion This criterion can be used to quantitatively determine the possibility and types of fracturing of any medium, under any triaxial stress state, and at any orientation interface (including pre-existing weak surface and non-weakness surface). It unifies the Coulomb-Mohr criterion, Byerlee's law, and Griffith's criterion, and extends fracturing to fracturing activation.
Significance The proposed criterion has broad application prospects in the fracturing activation-related resource (such as shale gas and hot, dry rock) exploration and development and prediction and prevention of natural disasters (such as earthquakes and landslides).
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