ISRM Suggested Methods for Determining the Creep Characteristics of Rock

Aydan, Ömer; Ito, Takashi; Ozbay, U.; Kwaśniewski, Marek; Shariar, K.; Okuno, Tatsusada; Özgeno⩽ğlu, A.; Malan, D.F.; Okada, Tetsuji

doi:10.1007/s00603-013-0520-6

Cited by 108 publications

(18 citation statements)

References 26 publications

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“…The same five groups of samples are again loaded to various preset stresses (0.5, 0.6, 0.7, 0.8 and 0.9 σ ucs ) and then kept constant. In this paper, the creep tests were controlled in accordance with the standard of the ISRM suggested methods for determining the creep characteristics of sandstone 51 . This process is a creep test, and the entire creep process lasts 8 h. The loading/unloading paths of the creep test is shown in Figure 2b.…”

Section: Methodsmentioning

confidence: 99%

Damage analysis of sandstone during the creep stage under the different levels of uniaxial stress using NMR measurements

Cheng

Zhou

Pan

et al. 2020

Fatigue Fract Eng Mat Struct

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In this paper, the nuclear magnetic resonance (NMR) measurements are carried out to evaluate the micro‐cracking characteristics of sandstones during the creep stage under the different levels of creep stresses. The variations in the parameters, including transverse relaxation time (T2) spectra distribution, percentage of the pore distribution, incremental value of porosity and ultrasonic P wave velocity are analysed. The results show that, during the creep stage, small pores in the rocks gradually evolve into large pores, resulting in an increase in damage of rocks. With the increase of the loading ratio, the increasing rate of porosity increases sharply, implying that the damage degree becomes more serious under the high loading ratio. When the loading ratio is larger than 0.7, the increasing rate of porosity and the decreasing rate of the P wave velocity both increases rapidly. During the creep stage, the relationship between micro‐crack and macro‐creep characteristics of rocks is established based on the analysis of the deformation and the porosity evolution during creep. It is found that, as the loading ratio increases, the increasing rate of porosity is linear with the creep strain. The NMR method offers a feasible option to identify micro‐cracking process of rocks during the creep stage, which can directly reflect the damage mechanism of rock caused by creep. The porosity of rocks is an effective parameter to evaluate the damage of rocks. The damage evolution of the specimen is highly anisotropic and is heavily related to the loading ratio during the creep stage. The relationship between the damage parameter and the loading ratio is exponential.

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Section: Methodsmentioning

confidence: 99%

Damage analysis of sandstone during the creep stage under the different levels of uniaxial stress using NMR measurements

Cheng

Zhou

Pan

et al. 2020

Fatigue Fract Eng Mat Struct

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“…All specimens are sandstone from Hebei Province and in accordance with the International Society of Rock Mechanics (ISRM) standard (Aydan et al, 2014), processed into cylinder specimens with 50 mm diameter and 100 mm high as shown in Figure 5.…”

Section: Rock Specimens and Test Equipmentmentioning

confidence: 99%

Nonlinear creep damage model considering effect of pore pressure and analysis of long-term stability of rock structure

Liu

Wang

et al. 2019

International Journal of Damage Mechanics

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Water changes natural seepage in the surrounding geological environment and weaken rock mass of valley during reservoir impounding, which result in large time-dependent deformation of foundation of dam. A nonlinear creep damage model considering water effect is proposed by taking into account the influence of pore pressure on the spherical stress tensor and yield surface. The elastic-viscoelastic model is consisted of a spring and several cascaded Kelvin models. The model is implemented in the ABAQUS user material subroutine. The accuracy of the model is verified by the triaxial creep test of saturated sandstone and dry sandstone. Then it is applied in the valley contraction analysis during impounding of Xiluodu high arch dam.

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“…Therefore, the differences of chemical composition and density of the samples were negligible. After polishing and cutting, the samples were processed into cylinder with 50 mm in diameters and 100 mm in height according to the International Society for Rock Mechanics (ISRM) [24], shown in Fig. 1.…”

Section: Experimental Materialsmentioning

confidence: 99%

The Effect of Initial Creep Damage on Unloading Failure Properties of Sandstone from Macro-mesoscopic Perspective

Wang

Qiao

2019

Period. Polytech. Civil Eng.

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The aim of this research was to show the effect of initial creep damage on unloading failure of rock from macro-mesoscopic perspective. A series of triaxial creep tests were carried out on sandstone to simulate initial creep damage and then unloading confining pressure tests were performed, respectively. A creep damage variable was proposed to analyze the degree of initial creep damage and the relationship of it with the macroscopic strength parameters was established. The results showed that the unloading amount of confining pressure and residual strength all tend to decrease when the degree of initial creep damage increases. The critical challenge was how to describe the effect of initial creep damage from mesoscopic perspective. This aim was achieved through two steps. In the first step, the mesoscopic properties were analyzed using experimentally obtained SEM images of the rock samples with different levels of initial creep damage. By comparative analysis of porosities in different magnifications, it can be concluded that porosity can’t reflect the effect of initial creep damage very well, thus, other pore parameters are further proposed. In the second step, three pore parameters were calculated by using the Matlab and IPP software, then, the average value of mean pore diameter is determined as the proper evaluation parameter and, finally, the agreement was verified between the mesoscopic pore parameter and creep damage variable.

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ISRM Suggested Methods for Determining the Creep Characteristics of Rock

Cited by 108 publications

References 26 publications

Damage analysis of sandstone during the creep stage under the different levels of uniaxial stress using NMR measurements

Damage analysis of sandstone during the creep stage under the different levels of uniaxial stress using NMR measurements

Nonlinear creep damage model considering effect of pore pressure and analysis of long-term stability of rock structure

The Effect of Initial Creep Damage on Unloading Failure Properties of Sandstone from Macro-mesoscopic Perspective

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