An experimental study on rock damage and its influence in rock stress memory in a metamorphic rock

Srinivasan, Vinoth; Gupta, T. K.; Ansari, Tariq Anwar; Singh, T. N.

doi:10.1007/s10064-020-01813-y

Cited by 14 publications

(4 citation statements)

References 48 publications

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“…e small-bore rock samples are sufficient for stress adjustment, and large strain is formed in the process of stress adjustment. However, there is no time for the large-bore rock samples to undergo large stress degree adjustment, and the overall failure occurs, corresponding to the reduction of the failure strain [14,15]. Due to the existence of holes, the initial damage of the rock samples containing holes is increased and the strong brittleness is reduced.…”

Section: Borehole Pressure Relief Controlmentioning

confidence: 99%

Analysis on the Difference of Energy Evolution in the Process of Energy Storage Failure of Strong Coal Rush Rock Samples under Different Adaptive Modification Regulation Measures

Zhang

2022

Shock and Vibration

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Current energy to “release” after accumulating + first for the mechanism of rock bursts occurred in analysis of the strategy is accepted by many scholars, based on the existing means of prevention and control of percussive ground pressure, from the angle of the prevention and control of design of the mechanism of impact ground pressure energy regulation, namely, “weakened after the first release +” softened water injection measures and “lead after the first release +” drilling pressure relief measures, for the study of mining under the action of a strong shock tendentiousness rock energy regulatory mechanism; based on rock mechanics experiment, the analysis under different modification measures should be variant energy storage mechanisms of induced damage evolution of rock energy. The mechanism of energy evolution in the modification of strong bursting liability roof rock is revealed. The results show that different modification regulation measures can effectively change the physical and mechanical parameters of target rock samples and realize “hard rock softening or soft rock hardening.” Samples under different modification measures are classified as initial consolidation stage, elastic stage, stage of plastic deformation, yield failure stage, and late stage, the energy evolution is roughly the same as the sample complete natural condition, but the yield failure stage and the destruction of late stage have an obvious difference, which provides favorable conditions for impact ground pressure to prevent. With the help of three characteristic energy indexes of total strain, elastic strain energy, and dissipative strain energy of rock samples, the evolution law of energy indexes under different modification control measures is analyzed. The index of elastic energy consumption ratio is introduced as a precursor feature of rock instability and failure, which indicates the rock impact tendency to a certain extent. The energy regulation mechanisms of “first release+then weakening” water injection softening measures and “first release+then guidance” drilling pressure relief measures are explained theoretically, respectively. However, we should focus on the defects of the corresponding control measures and finally try to make a reasonable combination of different modification measures. Finally, the gradient pressure relief scheme should be considered in order to avoid large stress drop caused by large-scale pressure relief in the region and aggravate the instability of rock mass. The instability of rock mass is further aggravated.

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Section: Borehole Pressure Relief Controlmentioning

confidence: 99%

Analysis on the Difference of Energy Evolution in the Process of Energy Storage Failure of Strong Coal Rush Rock Samples under Different Adaptive Modification Regulation Measures

Zhang

2022

Shock and Vibration

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“…For the evolution process of rock mass damage, many scholars have also reached specific conclusions [13,[15][16][17], but the damage evolution of different rocks under external loads is not consistent. It shows that the damage of the loaded rock does not depend on the external loading path only but is also closely related to the mechanical response of the rock mass [18]. e study of the mechanical response of the loaded rock mass is basic research to study the evolution law of rock damage, the damage constitutive relationship, and the strength change of the damaged rock mass.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Energy Dissipation of Sandstone under Cyclic Loading-Unloading

Xie

et al. 2021

Shock and Vibration

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For the bearing rock in geotechnical engineering, it is frequently affected by external loads. This paper adopted different upper limits of stress to carry out cyclic loading-unloading on the sandstone specimens to make them in different damage degrees and analyzed the mechanical mechanism of the damaged sandstone under different stresses. Then, the strength change and energy evolution of sandstone with different damage degrees were analyzed, and the damage of the loaded sandstone was quantitatively characterized. The experimental results showed that the strength and plastic deformation of sandstone after cyclic loading-unloading with different upper-stress limits gradually decreased with the increase of the upper-stress limit. In the loading-unloading stages of cyclic loading-unloading, the elastic modulus increased with the increase of the upper-stress limit. In general, as the number of cycles increased, the total strain energy density and elastic deformation energy density gradually increased, and as the upper-stress limit increased, both of them also increased. The damage factor of sandstone after cyclic loading-unloading, which was characterized by dissipated energy, increased in an S-shape with the increase of the upper-stress limit, and the growth rate first increased and then decreased.

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“…Moreover, these approaches may lack adequate accuracy [7][8][9]. Recently, a quick and convenient approach based on the Kaiser effect of rock has been considered as a promising alternative from the viewpoint of practice [10][11][12]. The Kaiser effect is widely documented in rocks and materials under the uniaxial cyclic loading and unloading (UCLU) test [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…For instance, when σ A is low, the AE produced by the friction of the microcracks cannot be eliminated, which complicates the identification of σ AE [18,24,25]. On the other hand, if σ A is very high, the Kaiser effect vanishes, and due to that, unstable cracking takes place within the rock and AE happens before the maximum history stress is reached [11,26,27]. It has been also reported that the loading strain rate strongly affects the crack evolution and propagation [18,19,28].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Appropriate Experimental Parameters for Studying the Kaiser Effect of Rock

Chen

Meng

et al. 2020

Applied Sciences

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The Kaiser effect of rock has been extensively studied due to its wide application in in-situ stress measurement and rock damage quantification. The uniaxial cyclic loading and unloading (UCLU) test is commonly employed to examine the rock Kaiser effect. However, how the two critical parameters, including prescribed stress in the first loading cycle (σA) and loading strain rate (lsr), affect the appearance of the Kaiser effect lacks thorough understanding. We systematically performed UCLU tests on 75 sandstone specimens under 25 combinations of σA and lsr. σA spans from 0.5σc (σc is the uniaxial compressive strength) to 0.9σc, and lsr ranges from 10−5 s−1 to 10−3 s−1, respectively. The acoustic emission characteristics of all the rock specimens are continuously monitored over the entire tests. We find that the Kaiser effect is unanimously observed in the stable crack growth stage, corresponding to the stress levels of 0.5σc to 0.7σc because under a lower stress, the Kaiser effect is easily covered by the acoustic emissions generated by microcrack friction. The loading strain rate also heavily affects the occurrence of the Kaiser effect. When lsr does not exceed 10−4 s−1, the Felicity ratio (FR) rises quickly as lsr ascends, whereas FR increases less pronouncedly once lsr exceeds 10−4 s−1. Therefore, a relatively high loading strain rate, i.e., lsr higher than 10−4 s−1, is suggested to facilitate the appearance of the Kaiser effect.

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An experimental study on rock damage and its influence in rock stress memory in a metamorphic rock

Cited by 14 publications

References 48 publications

Analysis on the Difference of Energy Evolution in the Process of Energy Storage Failure of Strong Coal Rush Rock Samples under Different Adaptive Modification Regulation Measures

Analysis on the Difference of Energy Evolution in the Process of Energy Storage Failure of Strong Coal Rush Rock Samples under Different Adaptive Modification Regulation Measures

Mechanical Properties and Energy Dissipation of Sandstone under Cyclic Loading-Unloading

Assessment of Appropriate Experimental Parameters for Studying the Kaiser Effect of Rock

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