利用钻孔破裂进行原位应力分析的多轴向破坏标准:审查现有方法并开发经验替代方法

IF 7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL International Journal of Rock Mechanics and Mining Sciences Pub Date : 2024-08-20 DOI:10.1016/j.ijrmms.2024.105864
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引用次数: 0

摘要

分析压缩性井筒失效或破裂是限制深井眼最大水平应力的主要方法之一。要通过观察破裂来估算应力,需要根据图像测井仪测量破裂宽度,并使用失效理论来预测导致测量破裂的应力。最常用的是莫尔-库仑失效准则,它忽略了中间应力对强度的影响。因此,人们提出了各种多轴判据,以纳入这种影响。在此,我们首先回顾一些选定的多轴准则:我们得出的结论是,在断裂分析中应用这些准则可能很麻烦,而且往往不可靠。造成这些问题的原因之一是,这些标准是使用应力不变式定义的,而应力估计最容易在主应力空间中进行和分析。因此,另一种方法是将多轴标准定义为最大应力和中间应力之间的简单关系。我们建议将这种经验准则定义为二阶多项式,它符合多轴实验室强度数据中观察到的趋势。这种方法可以限制强度过高估计,而强度过高估计通常与使用以前的多轴标准有关,并且可以轻松地将强度估算的不确定性与最大水平应力预测的不确定性联系起来。
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Polyaxial failure criteria for in situ stress analysis using borehole breakouts: Review of existing methods and development of an empirical alternative

Analysis of compressive wellbore failure, or breakouts, is one of the primary methods of constraining the maximum horizontal stress in deep boreholes. To estimate stress using the observation of breakouts, one needs to measure the breakout width from image logs and use a failure theory to predict the stress that led to the development of the measured breakout. Most commonly, Mohr–Coulomb failure criterion has been used which disregards the influence of intermediate stress on strength. Hence, various polyaxial criteria have been proposed to include this effect. Here, we first review some selected polyaxial criteria: Drucker–Prager, Mogi, Modified Wiebols–Cook, and Modified Lade, and we conclude that their application in breakout analysis may be cumbersome and often unreliable. One reason for these problems is that the criteria are defined using stress invariants, while the stress estimation is most easily performed and analyzed in the principal stress space. Therefore, an alternative is to define the polyaxial criterion as a simple relation between maximum and intermediate stresses. We propose to define such an empirical criterion as a second order polynomial which fits trends observed in polyaxial laboratory strength data. Such approach allows to limit strength overestimation, often associated with the use of previous polyaxial criteria, and to easily relate uncertainties in strength estimation to uncertainty in maximum horizontal stress prediction.

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来源期刊
CiteScore
14.00
自引率
5.60%
发文量
196
审稿时长
18 weeks
期刊介绍: The International Journal of Rock Mechanics and Mining Sciences focuses on original research, new developments, site measurements, and case studies within the fields of rock mechanics and rock engineering. Serving as an international platform, it showcases high-quality papers addressing rock mechanics and the application of its principles and techniques in mining and civil engineering projects situated on or within rock masses. These projects encompass a wide range, including slopes, open-pit mines, quarries, shafts, tunnels, caverns, underground mines, metro systems, dams, hydro-electric stations, geothermal energy, petroleum engineering, and radioactive waste disposal. The journal welcomes submissions on various topics, with particular interest in theoretical advancements, analytical and numerical methods, rock testing, site investigation, and case studies.
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