Development of a transparent triaxial cell and observation of rock deformation in compression and creep tests

Okubo, Seisuke; Fukui, Katsunori; Hashiba, Kimihiro

doi:10.1016/j.ijrmms.2007.05.006

Cited by 23 publications

(6 citation statements)

References 15 publications

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“…Transparent pressure cells are essential for application of the 3D-DIC technique to triaxial compression of rock materials. The material and structure of the transparent cells used in this study are the same as those in Okubo et al (2008), but they were manufactured using the latest technology without seams and bubbles, as shown in Figure 1(c). Due to the convexity of the transparent cell and the hydraulic oil within, the specimen will be magnified for easy observation of specimen deformation and observation of crack evolution by eyes and cameras during triaxial compression.…”

Section: Pressure Cellmentioning

confidence: 99%

Literature survey and application of a full-field 3D-DIC technique to determine the damage characteristic of rock under triaxial compression

Tang

Zhang

Ren

2022

International Journal of Damage Mechanics

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Digital-image correlation (DIC) is a deformation-measurement technique used to determine rock and soil mechanics. We review DIC tests of rock and soil, with data categorized according to specimen shape, test type, and DIC method. A new three-dimensional-DIC system integrates a transparent triaxial-compression servo-control test system for rocks. The confining pressure cell is transparent and three groups of image-acquisition units, which can be controlled with loading cell at the same time, are adopted to obtain the maximum observed fields. The average magnification factors caused by the transparent cell and oil are 1.4430 and 1.0331 for the measured horizontal and vertical distances, respectively. A triaxial compressive test of rock is performed and the specimen’s surface-strain fields and crack propagation are discussed.

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Section: Pressure Cellmentioning

confidence: 99%

Literature survey and application of a full-field 3D-DIC technique to determine the damage characteristic of rock under triaxial compression

Tang

Zhang

Ren

2022

International Journal of Damage Mechanics

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“…Fujii et al (1999) explored the effect of confining pressures and moisture on the circumferential strain behavior of granite and sandstone, using the short-term triaxial creep test, and believed that the circumferential strain can be applied in order to describe the damage during the test [ 16 ]. Okubo et al (2008) designed the transparent triaxial cell to observe the time-dependent deformation of tuff and shale more intuitively [ 17 ]. Nicolas et al (2017) analyzed the brittle creep mechanical behaviors of limestone by the evolution laws of ultrasonic wave velocities, as well as microstructural observations using the scanning electron microscope [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation on the Creep Behavior of Deep Brittle Rock Materials

2022

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The stability of deep rock engineering, especially during the excavation, is inextricably linked to the time-dependent mechanical properties of brittle rock. Therefore, the uniaxial creep test in a multilevel loading path is carried out, accompanying the real-time DIC (digital image correlation) and AE (acoustic emission) technologies. For the quartz sandstone, the lateral strain is more sensitive to increasing stress levels, and the lateral ductility is more significant during the creep process. The saturated quartz sandstone shows a certain bearing capacity before the volumetric dilation predominance. The softening effect of moisture causes a nearly invariable Poisson’s ratio during the middle stress stages, as well as the more notable increasing trend of a steady creep rate with an increasing stress level, reflected by the larger slope and the intercept in the fitting relations. The main shear pattern and the combination of the shear and splitting failures are separately shown by the dry and saturated quartz sandstone. For the granite, both compression and extension exist in the creep deformation, and the failure may first occur in the prominent deformation area with a cracking noise. The AE hits present a similar time-dependent behavior to the strain of rock, and the attenuation trend happens in both the AE amplitude and energy before the rock enters the unsteady phase. The incomplete specimen of granite exhibits a lower strength and a larger deformation, owing to the more remarkable damage accumulation reflected by the spatial distribution of the AE event points.

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“…Lollino et al [13] studied the pre-peak mechanical behavior of red-bed soft rock through loading, tensile, and shear tests under low confining pressures. Meanwhile, many scholars have studied the failure mechanisms of red-bed soft rock considering water corrosion [14][15][16][17][18][19][20]. When red-bed soft rocks encountering poor engineering conditions, Leuthold et al [21] conducted triaxial tests of porous soft rock under dry and wet environments to obtain the law of permeability variation and shear zone distribution.…”

Section: Introductionmentioning

confidence: 99%

The Critical Indicator of Red-Bed Soft Rocks in Deterioration Process Induced by Water Basing on Renormalization Group Theory

et al. 2021

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The internal damage of red-bed soft rock induced by water is pervasive. The accumulation, growth, and localization of damage is a multi-scale process that can lead to significant strength loss in red-bed soft rock. Yet, research on the critical state of deterioration process considering multi-scale failure is limited due to high degree of system freedom. Renormalization group theory is an effective approach to find critical point of phase transition in a disordered system. To apply renormalization group theory in red-bed soft rocks, this article firstly analyzed their microstructures. Then, the granular unit model and stripy unit model are proposed to describe the self-similar characteristics of red-bed soft rocks. The calculation results based on renormalization group theory are consistent with the experimental results. The critical reductions of strength induced by water are 60% in light-yellow silty mudstone and 80% in grey silty mudstone. In addition, the critical state of damage propagation caused by stress is also studied and the analytical solution is derived. Results show that the renormalization group theory can effectively couple the micro damage and strength deterioration which provides guidance to the engineering.

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Development of a transparent triaxial cell and observation of rock deformation in compression and creep tests

Cited by 23 publications

References 15 publications

Literature survey and application of a full-field 3D-DIC technique to determine the damage characteristic of rock under triaxial compression

Literature survey and application of a full-field 3D-DIC technique to determine the damage characteristic of rock under triaxial compression

An Experimental Investigation on the Creep Behavior of Deep Brittle Rock Materials

The Critical Indicator of Red-Bed Soft Rocks in Deterioration Process Induced by Water Basing on Renormalization Group Theory

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