On Propagation Mechanism of Cracks Emanating from Two Neighboring Holes in Cubic Concrete Specimens under Various Lateral Confinements

سال انتشار: 1400
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 159

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شناسه ملی سند علمی:

JR_JMAE-12-4_007

تاریخ نمایه سازی: 29 فروردین 1401

چکیده مقاله:

The propagation mechanism of cracks emanating from two holes within the concrete specimens is studied by considering the effects of different lateral compressive stresses. The experimental part of this research work is carried out on some specially prepared pre-cracked specimens with two neighbouring holes under only a uniaxial compression in the laboratory. The numerical modeling part is performed under both the uniaxial compresion and the lateral confinment by the ۲D particle flow code (PFC۲D). It is shown that the lateral confinement may change the path of crack propagation in a specimen compared to that of the uniaxially-loaded one. Various senarios of the mixed mode radial crack propagation around the holes are obtained, and both the wing (induced tensile) cracks and secondary (shear) cracks are produced and propagated in various paths due to a change in the confining pressure. The fracturing pattern changes from a single tensile crack to that of the several shear bands by increasing the confining pressure. Also the number of shear cracks is increased by increasing the lateral confinement.On the other hand, as the confining pressure increases, the wing cracks start their growth from the walls and reach the center of the cracks under high confinements.

نویسندگان

M. Yavari

Department of mining Engineering, Bafgh Branch, Islamic Azad University, Bafgh, Iran

H. Haeri

State Key Laboratory for Deep GeoMechanics and Underground Engineering, Beijing, China

V. Sarfarazi

Department of Mining Engineering, Hamedan University of Technology, Hamedan, Iran

M. Fatehi Marji

Mine Exploitation Engineering Department, Faculty of Mining and Metallurgy, Institution of Engineering, Yazd University, Yazd, Iran

H. A. Lazemi

Department of mining Engineering, Bafgh Branch, Islamic Azad University, Bafgh, Iran

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