Circumferential strain behavior during creep tests of brittle rocks

Fujii, Yoshiyuki; Kiyama, Tamotsu; Ishijima, Yoji; Kodama, Junichi

doi:10.1016/s0148-9062(99)00024-8

Cited by 113 publications

(32 citation statements)

References 5 publications

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“…Although a large variation can be seen in each ∆σ-ε a relationship, ∆σ appears to be negatively correlated with ε a . For some rocks, it has been reported that both ε fe and σ fe increase with C e and that ε mcr increases with σ cr [38,41]. Thus, in this sense, the hydrate-sand specimens exhibited the opposite trend to these rocks.…”

Section: Discussionmentioning

confidence: 93%

Relationship between Creep Property and Loading-Rate Dependence of Strength of Artificial Methane-Hydrate-Bearing Toyoura Sand under Triaxial Compression

2017

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Abstract:Methane hydrate is anticipated to be a promising energy resource. It is essential to consider the mechanical properties of a methane hydrate reservoir to ensure sustainable production, since its mechanical behavior may affect the integrity of the production well, the occurrence of geohazards, and gas productivity. In particular, the creep property of methane-hydrate-bearing sediment is thought to have great significance in the long-term prediction of the mechanical behaviors of a reservoir. In earlier studies, triaxial compression tests were conducted on artificial methane-hydrate-bearing Toyoura sand under three axial-loading conditions, i.e., constant-strain-rate test, constant-stress-rate test, and creep (constant-stress) test. In this paper, the time-dependent properties of the methane-hydrate-bearing Toyoura sand observed in these tests were quantitatively discussed and found to be almost in agreement. The creep life obtained from the creep tests had a reasonably strong correlation with the loading-rate dependencies of strength, obtained from the constant-strain-rate tests and constant-stress-rate tests based on a simple hypothesis. The findings are expected to be used to develop a constitutive model considering the time-dependent behaviors of hydrate-bearing soil in future studies, and to improve the reliability of long-term prediction of the geomechanical response to gas extraction from a reservoir.

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Section: Discussionmentioning

confidence: 93%

Relationship between Creep Property and Loading-Rate Dependence of Strength of Artificial Methane-Hydrate-Bearing Toyoura Sand under Triaxial Compression

2017

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“…In most materials, it has been observed that a significant transient creep phase with the strain increased at a decreasing creep rate under a given constant stress, followed by a stationary creep at constant rate and eventually, an accelerated creep that precedes failure (Fujii, Kiyama, Ishijima, & Kodama, 1999;Li & Xia, 2000). As shown in (Yang, Daemen, & Yin, 1999).…”

Section: Behaviour Of Axial Strain With Timementioning

confidence: 99%

Creep behaviour and permeability evolution of cataclastic sandstone in triaxial rheological tests

Zhang

Shao

et al. 2014

European Journal of Environmental and Civil Engineering

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This article reports the results of triaxial creep tests of cataclastic sandstone cored from the dam foundation of a hydropower station. Meanwhile, the permeability measurements are performed in course of creep tests under hydro-mechanical coupling. The creep behaviours of studied rock and their effects on the permeability evolution have been analysed in detail. The results show that the studied rock exhibits pronounced irreversible time-dependent deformations. The strain rate increases by exponential functions as the deviatoric stress increased and the confining pressure decreased. The long-term strength can be defined at which the critical point of expansion strain rate is greater than the compression strain rate. In addition, important plastic deformation, obvious dilation and large strain rate are observed in the last stage of experimental tests. The permeability change shows some mutative correlation with the material porosity during the time-dependent deformation. But the trend of change is decreasing with the increase of deviatoric stress for all specimens. During the stage of steady creep, the permeability variation slowly decreases quasilinearly. It indicates that the fluctuation has no significant effect on permeability evolution. These results may provide the basis for the establishment of hydro-mechanical coupling creep model and the long-term stability analysis of structures.

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“…Fujii et al [12] stated that the circumferential strain at the peak strength is equal to that at the point where creep strain begins to accelerate. In the present study, we focused on the relation between axial strain and maximum lateral strain while observing failure processes in strength and creep tests; we found little difference between the observed strains.…”

Section: Results Of Creep Testsmentioning

confidence: 99%

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

Okubo

Fukui

Hashiba

2008

International Journal of Rock Mechanics and Mining Sciences

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Circumferential strain behavior during creep tests of brittle rocks

Cited by 113 publications

References 5 publications

Relationship between Creep Property and Loading-Rate Dependence of Strength of Artificial Methane-Hydrate-Bearing Toyoura Sand under Triaxial Compression

Relationship between Creep Property and Loading-Rate Dependence of Strength of Artificial Methane-Hydrate-Bearing Toyoura Sand under Triaxial Compression

Creep behaviour and permeability evolution of cataclastic sandstone in triaxial rheological tests

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

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