Mechanical behavior around double circular openings in a jointed rock mass under uniaxial compression

• Autorzy: Lin Qibin , Cao Ping , Cao Rihong , Lin Hang , Meng Jingjing

Identyfikatory

DOI

10.1007/s43452-020-00027-z

• Języki publikacji: EN

Abstrakty

EN

To better understand the mechanical behavior in a jointed rock mass, a series of uniaxial compression tests were conducted on non-persistently jointed rock specimens with double circular holes. Acoustic emission (AE) and digital image correlation (DIC) techniques were applied to capture micro-crack events and real-time strain field evolution in the specimens. The results indicate that the existence of non-persistent joints has a significant influence on the strength characteristics of the specimens. Specifically, peak strength decreases at first and reaches a minimum at 30° then increases with increase in the joint dip angle. DIC technology has successfully monitored the development of surface strain fields. The fracture evolution process is comprehensively understood. Every sudden change in a strain field is usually accompanied by apparent AE events and stress–strain curves take the form of oscillations. The crack coalescence modes among joints can be summarized as six types and the crack coalescence patterns around holes and joints can be divided into three categories. These results are helpful to understanding further the mechanical properties and fracture mechanism of openings in non-persistently jointed rock masses.

Słowa kluczowe

EN

circular opening; joint; mechanical behavior; acoustic emission; digital image correlation

PL

emisja akustyczna; cyfrowa korelacja obrazu; otwór kołowy

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2020
• Tom: Vol. 20, no. 1
• Strony: 264--281
• Opis fizyczny: Bibliogr. 41 poz., fot., rys., wykr.

Twórcy

autor

Lin Qibin

• School of Resources and Safety Engineering, Central South University, Changsha 410083, China

autor

Cao Ping

• School of Resources and Safety Engineering, Central South University, Changsha 410083, China

autor

Cao Rihong

• School of Resources and Safety Engineering, Central South University, Changsha 410083, China

autor

Lin Hang

• School of Resources and Safety Engineering, Central South University, Changsha 410083, China

autor

Meng Jingjing

• School of Resources and Safety Engineering, Central South University, Changsha 410083, China
• Department of Civil, Environmental and Natural Resources Engineering, Lulea University of Technology, 97187 Luleå, Sweden

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