Energy characteristics and micro cracking behaviors of deep slate rock under triaxial loadings

• Autorzy: Zhang Anlin , Feng Tao , Jiang Liangwen , Wang Dong , Wang Zhewei , Zhang Ru , Feng Gan , Zhang Zhilong , Deng Jianhui , Ren Li

Identyfikatory

DOI

10.1007/s11600-022-00810-x

• Języki publikacji: EN

Abstrakty

EN

Sichuan-Tibet railway tunnels are generally long and deep, and some of them pass through layered slate, which is prone to failure under high in situ stress. Insight into the mechanical behaviors of deep slate under different stress environments is critical to the safety of engineering practices in this area. To this end, we studied the energy characteristics and microcracking behaviors of slate samples under different triaxial loadings. The results showed that the confining pressure increased the strength, elastic modulus, Poisson’s ratio and crack characteristic stresses of the studied slate. As the confining pressure increased, the storage of elastic strain energy during the prepeak stress stage increased, and its release during the postpeak stress stage was inhibited. Additionally, we obtained the slate failure precursors by analyzing the acoustic emission (AE) evolution characteristics, i.e., “a sudden increase in AE metrics, followed by a quiet period, and then a sudden increase again” in terms of the AE count rate and AE energy rate after obvious expansion of the sample. Then, we further observed that with an increase in confining pressure, a gradual transition of the failure pattern from compressive shear to tensile shear occurred. Finally, we discussed the influence mechanisms of confining pressure on the slate failure behaviors and concluded that the change in the effective shear stress along the foliation planes played an important role in the failure mode transition.

Słowa kluczowe

EN

Sichuan-Tibet railway tunnel; slate; surrounding rock stability; different stress environments; energy evolution; micro-cracking behavior

PL

tunel kolejowy Syczuan-Tybet; łupek; stabilność otaczających skał

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2022
• Tom: Vol. 70, no 4
• Strony: 1457--1472
• Opis fizyczny: Bibliogr. 47 poz.

Twórcy

autor

Zhang Anlin

• College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China

autor

Feng Tao

• China Railway Eryuan Engineering Group Company, Ltd., Chengdu 610031, China

autor

Jiang Liangwen

• China Railway Eryuan Engineering Group Company, Ltd., Chengdu 610031, China

autor

Wang Dong

• College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China
• China Railway Eryuan Engineering Group Company, Ltd., Chengdu 610031, China

autor

Wang Zhewei

• China Railway Eryuan Engineering Group Company, Ltd., Chengdu 610031, China

autor

Zhang Ru

• MOE Key Laboratory of Deep Earth Science & Engineering, Sichuan University, Chengdu 610065, China

autor

Feng Gan

• College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China

autor

Zhang Zhilong

• College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China

autor

Deng Jianhui

• College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China
• MOE Key Laboratory of Deep Earth Science & Engineering, Sichuan University, Chengdu 610065, China

autor

Ren Li

• MOE Key Laboratory of Deep Earth Science & Engineering, Sichuan University, Chengdu 610065, China
• College of Architecture & Environment, Sichuan University, Chengdu 610065, China

• https://orcid.org/0000-0002-4003-8826

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Uwagi

PL

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).