Analysis of the cracking mechanisms in pre-cracked sandstone under radial compression by moment tensor analysis of acoustic emissions

• Autorzy: Wang Guozhu , Luo Xulin , Song Lei , Wang Yu , Han Mouwang , Song Zhaocun , Wu Linjun , Wang Zukun

Identyfikatory

DOI

10.24425/ace.2022.141896

• Języki publikacji: EN

Abstrakty

EN

Rock masses, especially those with different pre-existing cracks, are prone to instability and failure under tensile loading, resulting in different degrees of engineering disasters. Therefore, to better understand the effect of pre-existing cracks with different dip angles on the tensile instability failure behaviour of rocks, the mechanism of crack initiation, propagation and coalescence in precracked sandstone under radial compression loading is investigated through numerical simulations. The temporal and spatial evolution of acoustic emission (AE) events is investigated by the moment tensor (MT), and the fracture mode of micro-cracks is determined. The results show that the pre-existing cracks weaken the specimens. The strength, crack initiation points and macro-failure modes of the specimens differ significantly depending on the dip angle of the pre-existing crack. For different dip angles of the pre-existing cracks, all the micro-cracks at the crack initiation point are tensile cracks, which are dominant during the whole loading process, and mixed cracks are mainly generated near the upper and lower loading ends after the peak stress. Of the total number of events, more than 75% are tensile cracks; approximately 15% are shear mode cracks; and the remainder consist of mixed mode cracks. The study reveals the instability and failure mechanism of pre-cracked rock, which is of great significance to ensure the long-term stability of rock mass engineering.

Słowa kluczowe

EN

acoustic emission; cracking mechanism; moment tensor; pre-cracked sandstone; radial compression

PL

emisja akustyczna; mechanizm pękania; tensor momentu; piaskowiec wstępnie spękany; kompresja promieniowa

• Wydawca: Komitet Inżynierii Lądowej i Wodnej PAN ; Politechnika Warszawska, Wydział Inżynierii Lądowej
• Czasopismo: Archives of Civil Engineering
• Rocznik: 2022
• Tom: Vol. 68, nr 3
• Strony: 447--468
• Opis fizyczny: Bibliogr. 38 poz., il., tab.

Twórcy

autor

Wang Guozhu

• China University of Mining and Technology (CUMT), State Key Laboratory for Geomechanics and Deep Underground Engineering, Xuzhou, China

• https://orcid.org/0000-0003-2025-0907

autor

Luo Xulin

• Zhengzhou University of Industrial Technology, School of Architectural Engineering, Zhengzhou, China

• https://orcid.org/0000-0001-7263-4860

autor

Song Lei

• CUMT, Xuzhou, China

• https://orcid.org/0000-0002-2747-6805

autor

Wang Yu

• CUMT, Xuzhou, China

• https://orcid.org/0000-0003-4538-4055

autor

Han Mouwang

• CUMT, Xuzhou, China

• https://orcid.org/0000-0002-0283-3511

autor

Song Zhaocun

• CUMT, Xuzhou, China

• https://orcid.org/0000-0003-1905-3754

autor

Wu Linjun

• CUMT, Xuzhou, China

• https://orcid.org/0000-0001-7242-2753

autor

Wang Zukun

• CUMT, Xuzhou, China

• https://orcid.org/0000-0003-3975-2413

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).