تعیین گستره خرابی بریک- اوت پیرامون گمانه به کمک معیار موهر- کولمب و هوک- براون

نوع مقاله : مقاله پژوهشی

نویسندگان

1 عضو هیات علمی

2 دانشکده مهندسی عمران، دانشگاه زنجان، زنجان، ایران

چکیده

با حفرگمانه در توده سنگ و در اعماق زیاد توزیع تنش پیرامون آن برهم خورده و در مجاورت آن تمرکز تنش ایجاد می‌شود. اگر تنش‌های برشی ایجاد شده ناشی از فشار تنش‌های برجا، در سنگ پیرامون گمانه از مقاومت آن بیشتر شوند، باعث رخداد نوعی از خرابی در پیرامون گمانه می‌گردد که به آن خرابی بریک- اوت گفته می‌شود. مشاهده شده که نواحی خرابی بریک- اوت در امتداد تنش اصلی کوچکتر ایجاد شده و توسعه پیدا می‌کنند. در این مقاله با فرض رفتار الاستیک توده سنگ، به حل تحلیلی خرابی بریک- اوت با استفاده از معیار خرابی موهر- کولمب و هوک- براون برای مدل‌های دوبعدی پرداخته می‌شود و گستره خرابی با استفاده از این دو معیار بدست می‌آید. مطابق با نتایج بدست آمده از مدل ریاضی، پارامترهای مؤثر در عمق و عرض بریک- اوت رخ داده در پیرامون گمانه، وابسته به مشخصات مکانیکی مصالح موجود در معیار خرابی انتخاب شده و همچنین مقدار و نسبت تنش‌های برجا می‌باشند. درصورتی‌که نسبت تنش‌های برجا یک باشد، خرابی از نوع بریک- اوت رخ نخواهد داد. همچنین با افزایش کیفیت سنگ، گستره خرابی بریک- اوت کمتر می‌شود و با کاهش مشخصات مکانیکی سنگ و افزایش مقدار و نسبت تنش‌های برجا محدوده خرابی بزرگتر می‌شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Determination of breakout failure zone around the borehole using the Mohr-Coulomb and Hoek-Brown failure criteria

نویسندگان [English]

  • Ali Lakirouhani 1
  • Jabbar Addin Abbassi 2
1 Civil Engineering Department, Faculty of Engineering, University of Zanjan
2 Civil Engineering Department, University of Zanjan
چکیده [English]

By drilling borehole in the ground, the distribution of stress around it changes, and stress concentration is created. If the shear stress induced by in- situ stresses is more than rock strength, it causes a kind of failure around the borehole, which is called breakout. It has been observed that breakout failure zones are initiated and propagated in the direction of the minimum in- situ stress. In this paper, by the assumption of elastic behavior of rock mass, the analytical 2D analysis of breakout failure using the Mohr-Coulomb and Hoek-Brown failure criteria is addressed and the failure zone is obtained by using these two criteria. According to the results of the mathematical model, the effective parameters in the depth and width of the breakout occurring around the borehole are depended on the mechanical properties of the materials in the medium as well as the amount and ratio of in- situ stresses. If the ratio of stresses is one, breakout failure will not occur. Also, with increasing the rock quality, the breakout depth decreases, and with decreasing rock strength and increasing the amount and ratio of stresses, the breakout area becomes larger

کلیدواژه‌ها [English]

  • 2D Analytical Model
  • Breakout Failure
  • Mohr-Coulomb Failure Criterion
  • Hoek-Brown Failure Criterion
  • Elastic behavior

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 52، شماره 5
مرداد 1399
صفحه 1109-1126

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