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Spatial Failure Mode Analysis of Frozen Sandstone Under Uniaxial Compression Based on CT Technology
Abstract This study investigated the effects of freezing temperature on the failure modes of frozen sandstone under uniaxial compression loading conditions. First, the sandstone specimens were subjected to freezing treatments at different temperatures (e.g., 20, 0, − 5, − 10, − 15 and − 20 °C), and uniaxially compressed to failure in the frozen state. Subsequently, the real-time CT scanning was performed to observe the spatial three-dimensional and planar two-dimensional fracture morphology of the failed specimens. Next, the volumetric porosity and crack area were introduced to quantitatively describe the freezing temperature effects on the damage degree of specimens after compression failure. Finally, the box-counting dimension of cracks calculated by fractal theory and distribution images of crack orientation angle were used to quantitatively evaluate freezing temperature effects on the compression failure complexity of specimens. The results show that the tension-shear failure mode to shear failure mode occurs as temperature decreases, and the failure mode tends to be constant below − 10 °C. The volumetric porosity and crack area of the failed specimen decrease as temperature decreases. After specimen failure, the box-counting dimension of cracks decreases as temperature decreases, and the distribution range of crack orientation angle decreases, which indicates the failure complexity decreases.
Highlights Uniaxial compressive spatial failure modes of frozen sandstones were investigated.Tension-shear failure mode to shear failure mode occurred as temperature decreased.Failure mode tended to be constant as temperature decreased below − 10 °C.Compression failure complexity of specimens decreased as temperature decreased.
Spatial Failure Mode Analysis of Frozen Sandstone Under Uniaxial Compression Based on CT Technology
Abstract This study investigated the effects of freezing temperature on the failure modes of frozen sandstone under uniaxial compression loading conditions. First, the sandstone specimens were subjected to freezing treatments at different temperatures (e.g., 20, 0, − 5, − 10, − 15 and − 20 °C), and uniaxially compressed to failure in the frozen state. Subsequently, the real-time CT scanning was performed to observe the spatial three-dimensional and planar two-dimensional fracture morphology of the failed specimens. Next, the volumetric porosity and crack area were introduced to quantitatively describe the freezing temperature effects on the damage degree of specimens after compression failure. Finally, the box-counting dimension of cracks calculated by fractal theory and distribution images of crack orientation angle were used to quantitatively evaluate freezing temperature effects on the compression failure complexity of specimens. The results show that the tension-shear failure mode to shear failure mode occurs as temperature decreases, and the failure mode tends to be constant below − 10 °C. The volumetric porosity and crack area of the failed specimen decrease as temperature decreases. After specimen failure, the box-counting dimension of cracks decreases as temperature decreases, and the distribution range of crack orientation angle decreases, which indicates the failure complexity decreases.
Highlights Uniaxial compressive spatial failure modes of frozen sandstones were investigated.Tension-shear failure mode to shear failure mode occurred as temperature decreased.Failure mode tended to be constant as temperature decreased below − 10 °C.Compression failure complexity of specimens decreased as temperature decreased.
Spatial Failure Mode Analysis of Frozen Sandstone Under Uniaxial Compression Based on CT Technology
Fan, L. F. (author) / Fan, Y. D. (author) / Xi, Y. (author) / Gao, J. W. (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
Experimental study on ultrasonic characteristics of frozen sandstone under uniaxial compression
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