X-ray radiography for visualization of fissure fluid flows during rock failures

SUN Huan; LIU Xiaoli; WANG Enzhi; ZHANG Jianmin; WANG Sijing; LIU Chi

doi:10.16511/j.cnki.qhdxxb.2021.25.017

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Journal of Tsinghua University(Science and Technology) ›› 2021, Vol. 61 ›› Issue (8) : 778-791. DOI: 10.16511/j.cnki.qhdxxb.2021.25.017

Experimental Research

X-ray radiography for visualization of fissure fluid flows during rock failures

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Abstract

Fissure fluids can induce engineering hazards due to interactions between the fluid and the rock. Further research is needed to describe the induced hazards mechanism for fluid and rock interactions by observing fissure fluid flows during rock failures. This study used X-ray imaging to observe fissure fluid flows in rocks during failures. This work studied Karst landslides, slope instabilities in the rock bed mudstone (RBM) area and water bursting into the goaf. The results show that the laminar flows change to transitional or turbulent flows in the rocks during pipe rupture into the fissures. This process shows the fractal characteristics of pipe flows evolving with the fissure flows during Karst rock failures with multilevel stress loadings. Also, the RBM damage parameters increase non-linearly as the rock fails due to the coupled effects of the fluid dynamics and the multilevel stress loadings. This indicates that seepage control and diffusion can reduce and prevent landslides in the RBM area. The mean square fissure water flow rates also show fractional evolution during coal and rock failures, with the flow regime changing from sup-diffusion flow to sub-diffusion flow. The non-linear flow characteristics and anomalous diffusion of fissure water are key reasons for water bursting hazards during coal seam mining.

Key words

fissure fluids / X-ray radiography / pipe rapture / seepage diffusion / mean square flow rate

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SUN Huan, LIU Xiaoli, WANG Enzhi, ZHANG Jianmin, WANG Sijing, LIU Chi. X-ray radiography for visualization of fissure fluid flows during rock failures[J]. Journal of Tsinghua University(Science and Technology). 2021, 61(8): 778-791 https://doi.org/10.16511/j.cnki.qhdxxb.2021.25.017

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