Strength degradation of sandstone and granodiorite under uniaxial cyclic loading

Vaneghi, Rashid Geranmayeh; Ferdosi, Behnam; Okoth, Achola D.; Kuek, Barnabas

doi:10.1016/j.jrmge.2017.09.005

Cited by 99 publications

(22 citation statements)

References 22 publications

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Section: Short-term Strength and Deformation Failure Behaviormentioning

confidence: 89%

“…Figure 6 further illustrates the effect of confining pressure and damage on the peak strength of fractured specimens. From Figure 6, we can conclude that the peak strength of intact and fractured specimens under triaxial compression increase linearly with increasing confining pressure but decreases linearly with increasing damage [33,34]. Based on the peak strength values listed in Table 2, the equivalent cohesion (c) and internal friction angle (φ) can be calculated using the linear Mohr-Coulomb criterion [8,28], as listed in Table 3.…”

Section: Short-term Strength and Failure Behaviormentioning

confidence: 99%

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Experimental Investigation on the Post-Peak Short-Term and Creep Behavior of Fractured Sandstone

et al. 2020

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Short-term and creep tests of fractured sandstone with different degrees of damage prepared using pre-peak and post-peak unloading tests on intact sandstone were carried out using a servo-controlled rock mechanics system. Based on our experimental results, the influence of confining pressure and damage on short-term mechanical behavior of fractured sandstone with different degrees of damage was first analyzed. The results show that the peak strength, residual strength, elastic modulus, and secant modulus of fractured sandstone increase linearly with increasing confining pressure, but decrease with increasing damage. The short-term failure modes depend on the damage and change from typical shear failure modes to multiple shear failure modes with increasing damage. Then, the influence of the differential stress, confining pressure, and the degree of damage on the creep mechanical behavior of fractured specimens was further investigated. The axial instantaneous strain and creep strain increase linearly with increasing differential stress, and the specimens exhibit significant time-dependent behavior under high stress. The steady creep rate increases with increasing stress, but it decreases with increasing confining pressure and damage. However, the long-term strength and creep failure strength of fractured specimens increase linearly with increasing confining pressure, but they decrease linearly with increasing damage. The creep failure modes of fractured specimens are also the main shear failure modes, which are similar to the short-term failure modes.

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Section: Short-term Strength and Deformation Failure Behaviormentioning

confidence: 89%

Section: Short-term Strength and Failure Behaviormentioning

confidence: 99%

Experimental Investigation on the Post-Peak Short-Term and Creep Behavior of Fractured Sandstone

et al. 2020

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“…The construction of subsurface spaces was expected to exhibit explosive growth for purposes such as mine excavation as well as hydroelectric station, oil and gas storage plant, multi-purpose tunnel, nuclear power station, nuclear waste repository, and compressed air energy repository development. Some researchers have focused on the time-dependent response of specific rock types to stress conditions to investigate each type's creep and fatigue properties [1][2][3]. The stress condition and carrying capacity of rocks are key factors affecting their failure.…”

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confidence: 99%

Low amplitude fatigue performance of sandstone, marble, and granite under high static stress

Sun

Zhou

et al. 2021

Geomech. Geophys. Geo-energ. Geo-resour.

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Fatigue tests under high static pre-stress loads can provide meaningful results to better understand the time-dependent failure characteristics of rock and rock-like materials. However, fatigue tests under high static pre-stress loads are rarely reported in precious literatures. In this study, the rock specimens were loaded with a high static pre-stress representing 70% and 80% of the UCS, and cyclic fatigue loads with a low amplitude (i.e., 5%, 7.5% and 10% of the UCS) were applied. The results demonstrate that the fatigue life decreased as the static pre-stress level or amplitude of fatigue loads increased for all rock types, and the high static pre-stress affected the fatigue life greatly when the static pre-stress was larger than the damage stress of rocks in uniaxial compression test. The accumulative fatigue damage exhibited three stages during the fatigue failure process: crack initiation, uniform velocity, and acceleration, and so the fatigue modulus showed an "S-type" change trend. The lateral strain and volumetric strain had a much higher sensitivity to the cyclic loading and could be used to predict fatigue failure characteristics, and it was found that volumetric strain ε v = 0 is a threshold for microcracks coalescence and is an important value for estimating the fatigue life.

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“…Fatigue test is an important testing method to understand the failure characteristics of rocks under coupled dynamic (σ F ) and static stresses (σ S ). The fatigue failure is caused due to long-term repetitive loads with a peak stress level (σ max ) lower than their static strength (σ ss ) [17,18], as shown in Fig. 2.…”

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confidence: 99%

“…2. A clear understanding of the time-dependednt fatigue mechanical performance of EDZ rocks is significant for support design and potential hazard prevention in underground engineering [16][17][18].…”

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confidence: 99%

Experimental investigations on mechanical performance of rocks under fatigue loads and biaxial confinements

Yang

et al. 2020

J. Cent. South Univ.

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In this research, a series of biaxial compression and biaxial fatigue tests were conducted to investigate the mechanical behaviors of marble and sandstone under biaxial confinements. Experimental results demonstrate that the biaxial compressive strength of rocks in under biaxial compression first increases firstly, and then subsequently subsequently decreases with the increase of the intermediate principal stress. The fatigue failure characteristics of the rocks in biaxial fatigue tests is are a functions of the peak value of fatigue loads, the intermediate principal stress and the rock lithology. With the increase of the peak values of fatigue loads, the fatigue life lives of rock specimenss decreases. The intermediate principal stress strengthens the resistance ability of rocks to fatigue loads except considering the strength increasing under biaxial confinements. The fatigue lives of rocks increase with the increase of the intermediate principal stress under the same ratio of the fatigue load and their biaxial compressive strength.From the acoustic emission (AE) and fragments studies showed that, it was found that the sandstone has higher ability to resist the fatigue loads compared to the marble. , and It was also found that the marble generated a greater number of smaller fragments after fatigue failure compared to the sandstone. From the studySo, it can be inferred that fatigue load can enhance the rock breaking efficiency, and can induce and rock burst severely is higher or severer in induced by fatigue loadingrocks under fatigue loading than that in induced by monotonous quasi-static loading, especially for hard rocks.

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Strength degradation of sandstone and granodiorite under uniaxial cyclic loading

Cited by 99 publications

References 22 publications

Experimental Investigation on the Post-Peak Short-Term and Creep Behavior of Fractured Sandstone

Experimental Investigation on the Post-Peak Short-Term and Creep Behavior of Fractured Sandstone

Low amplitude fatigue performance of sandstone, marble, and granite under high static stress

Experimental investigations on mechanical performance of rocks under fatigue loads and biaxial confinements

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