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 16 publications

(6 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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“…The number of cycles and the elastic strain energy are positively correlated with the hysteresis loop area [25][26]. Srinivasan et al [27] divided rock samples into different degrees of rock stress memory according to the characteristics that rock can retain stress after loading. The higher damage caused by the initial loading and rock fracture is the reason for the poor stress memory of rock.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Energy of Sandstone Under Cyclic Loading in Evolutionary Pattern Experimental Studies

2023

Archives of Mining Sciences

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Mechanical ProPerties and energy of sandstone Under cyclic loadingin evolUtionary Pattern exPeriMental stUdies in order to explore the mining failure law of deep coal seam floor and clarify the mechanical behavior and energy change in the floor strata during mining, the mechanical properties and energy evolution law of sandstone under cyclic loading with different confining pressures (20, 30, 40 MPa) were studied using the Rock Top multi-field coupling tester. The results are as follows: (1) the hysteresis phenomenon of a rock stress-strain curve under cyclic loading is evident. Moreover, the hysteresis loop migrates to the direction of strain increase, and the fatigue damage caused by cyclic loading has a certain weakening effect on the peak strength of rock; (2) both the number of cycles and the axial strain show a nonlinear change characteristic that satisfies the quadratic function relationship. Among them, the stress level of the rock is the main factor affecting the fitting effect; (3) under the same confining pressure, with an increase in cycle level, the macroscopic deformation of the rock increases, the accumulation of fatigue damage in the sample increases, and the irreversible deformation of the rock increases, which leads to an increase in energy input and dissipation; (4) in terms of elastic energy and dissipation energy, elastic energy plays a dominant role. in the initial cycle, the rock is destroyed, and the rock energy loss is great. After the second cycle, the input energy is mainly stored in the rock in the form of elastic energy, and only a small part of the input energy is released in the form of dissipation energy; (5) the confining pressure can improve the efficiency of rock absorption and energy storage, enhance the energy storage limit of rock, and limit the dissipation and release of partial energy of rock. The greater the confining pressure, the more evident the limiting effect, and the more significant the dominant position of elastic energy; and (6) the change in the energy dissipation ratio can be divided into three stages: rapid decline stage, stable development stage and rapid rise stage. The greater the increase in dissipation energy, the greater the degree of rock damage. The evolution process of the energy dissipation ratio can reflect the internal damage accumulation process of rock well, which can be used as the criterion of rock instability.

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

Cited by 16 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 of Sandstone Under Cyclic Loading in Evolutionary Pattern Experimental Studies

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

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