Dynamic failure behavior of Jinping marble under various preloading conditions corresponding to different depths

To better understand the dynamic mechanical properties of rock at different depths, a method to simplify the stress characteristics of the rock mass surrounding a circular cavern was developed, and a series of impact tests involving high-speed photographic monitoring were performed on deep marble dr...

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Veröffentlicht in:International journal of rock mechanics and mining sciences (Oxford, England : 1997) England : 1997), 2021-12, Vol.148, p.104959, Article 104959
Hauptverfasser: Zhang, Anlin, Xie, Heping, Zhang, Ru, Ren, Li, Zhou, Jifang, Gao, Mingzhong, Tan, Qiang
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Sprache:eng
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Zusammenfassung:To better understand the dynamic mechanical properties of rock at different depths, a method to simplify the stress characteristics of the rock mass surrounding a circular cavern was developed, and a series of impact tests involving high-speed photographic monitoring were performed on deep marble drilled in situ in the China Jinping Underground Laboratory at nine preloaded uniaxial stress levels (corresponding to simulated depths of 0, 100, 300, 600, 700, 900, 1200, 1500 and 1800 m). The results indicated that the strain rate sensitivity of the dynamic strength of Jinping marble decreased with the simulated depth, and obvious ductile deformation and failure characteristics occurred under high-energy dynamic loading and great depths. According to the fragmentation records, cracks clearly initiated and propagated mainly along the axial direction, and the observed failure patterns were classified into three typical modes: striped fragmentation (depth
ISSN:1365-1609
1873-4545
DOI:10.1016/j.ijrmms.2021.104959