Crack evolution and acoustic emission characteristics of rock specimens containing random joints under uniaxial compression

Ma, Wenqiang; Wang, Jiuting; Li, Xiaoxiao; Wang, Tongxu

doi:10.1007/s11600-021-00686-3

Artykuł - szczegóły

Tytuł artykułu

Crack evolution and acoustic emission characteristics of rock specimens containing random joints under uniaxial compression

Autorzy

Ma Wenqiang , Wang Jiuting , Li Xiaoxiao , Wang Tongxu

Wybrane pełne teksty z tego czasopisma

https://www.springer.com/journal/11600

Identyfikatory

DOI

10.1007/s11600-021-00686-3

Warianty tytułu

Języki publikacji

Abstrakty

Joints greatly affect the mechanical behavior and crack evolution of jointed rock masses. In this paper, numerical specimens containing pre-existing random joints are constructed based on a combination of the fat-joint and smooth-joint models in the particle flow code in two dimensions (PFC2D). Then, uniaxial compression of these specimens is carried out to reveal the influence of joint length or number on the mechanical behavior, crack development, acoustic emission (AE) event attributes and failure characteristics. The results suggest that a univariant increase in random joint length or number leads to a nonlinear decrease in the uniaxial compressive strength (UCS) and a linear decrease in the elastic modulus, while the fracture behavior of the specimens shows a transformation from brittle to ductile in this process. With increasing joint length or number, the cracks and AE events generated in the joints significantly increase and exceed those generated in the intact rock. Tension cracks play a dominant role in the development of cracks within intact rock, while shear cracks dominate the crack evolution of random joints. More cracks appear in the jointed rock specimens at the elastic deformation stage as the joint length or number increases. The variation in the joint length or number strongly influences the mechanical behavior, crack evolution and failure pattern of the randomly jointed rock specimen.

Słowa kluczowe

jointed rock mass random joints mechanical behavior crack evolution AE event

masa skalna łączona połączenia losowe zachowanie mechaniczne ewolucja pęknięć

Wydawca

Instytut Geofizyki PAN
Springer

Czasopismo

Acta Geophysica

Rocznik

2021

Tom

Vol. 69, no. 6

Strony

2427--2441

Opis fizyczny

Bibliogr. 26 poz.

Twórcy

autor

Ma Wenqiang

College of Architecture and Civil Engineering, Shihe District, Xinyang Normal University, No. 237, Nanhu Road, Xinyang City 464000, Henan Province, China

autor

Wang Jiuting

College of Architecture and Civil Engineering, Shihe District, Xinyang Normal University, No. 237, Nanhu Road, Xinyang City 464000, Henan Province, China

autor

Li Xiaoxiao

lxxmxr@163.com

College of Architecture and Civil Engineering, Shihe District, Xinyang Normal University, No. 237, Nanhu Road, Xinyang City 464000, Henan Province, China

https://orcid.org/0000-0001-6831-4506

autor

Wang Tongxu

State Key Laboratory of Mining Disaster Prevention and Control Co-Founded By Shandong Province and The Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China

Bibliografia

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Typ dokumentu

Bibliografia

Identyfikator YADDA

bwmeta1.element.baztech-23942be6-a836-43e4-ad15-7ccf1473429b