Damage and fractal evolution trends of sandstones under constant-amplitude and tiered cyclic loading and unloading based on acoustic emission

Liang, Dongxu; Zhang, Nong; Xie, Lixiang; Zhao, Guiping; Qian, Deyu

doi:10.1177/1550147719861020

Cited by 20 publications

(5 citation statements)

References 35 publications

(35 reference statements)

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“…Another type of time-dependent inelastic deformation is known as creep deformation, in which the material constantly deforms under the application of a constant and persistent external load, irrespective of the stress levels [161,156]. Lastly, damage strain can occur which can initiate microcracks and lead to the failure of rocks [162,163]. Few rocks also show anisotropic elastic deformation which needs to be accounted for effectively using appropriate constitutive formulations [164,165,166].…”

Section: Geomechanical Constitutive Modelsmentioning

confidence: 99%

Comprehensive review of geomechanics of underground hydrogen storage in depleted reservoirs and salt caverns

Ramesh Kumar,

Honorio,

Chandra

et al. 2023

Preprint

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Hydrogen is a promising energy carrier for a low-carbon future energy system, as it can be stored on a megaton scale (equivalent to TWh of energy) in subsurface reservoirs. However, safe and eﬀicient underground hydrogen storage requires a thorough understanding of the geomechanics of the host rock under fluid pressure fluctuations. In this context, we summarize the current state of knowledge regarding geomechanics relevant to carbon dioxide and natural gas storage in salt caverns and depleted reservoirs. We further elaborate on how this knowledge can be applied to underground hydrogen storage. The primary focus lies on the mechanical response of rocks under cyclic hydrogen injection and production, fault reactivation, the impact of hydrogen on rock properties, and other associated risks and challenges. In addition, we discuss wellbore integrity from the perspective of underground hydrogen storage. The paper provides insights into the history of energy storage, laboratory scale experiments, and analytical and simulation studies at the field scale. We also emphasize the current knowledge gaps and the necessity to enhance our understanding of the geomechanical aspects of hydrogen storage. This involves developing predictive models coupled with laboratory scale and field-scale testing, along with benchmarking methodologies.

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Section: Geomechanical Constitutive Modelsmentioning

confidence: 99%

Comprehensive review of geomechanics of underground hydrogen storage in depleted reservoirs and salt caverns

Ramesh Kumar,

Honorio,

Chandra

et al. 2023

Preprint

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“…Meng et al [ 10 ] used the MTS815 rock mechanics test system to carry out triaxial cyclic loading and unloading tests on limestone with different surrounding rocks, and studied the strength, dilatancy deformation and damage mechanical properties of rock during cyclic loading and unloading. In addition, many scholars conducted detailed research on the damage and failure of coal and rock mass during cyclic loading and unloading from the perspectives of plastic deformation [ 11 , 12 ], energy dissipation [ 13 , 14 ] and acoustic emission characteristics [ 15 , 16 ] of coal and rock mass.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Mechanical and Damage Evolution Characteristics of Coal during True Triaxial Cyclic Loading and Unloading

et al. 2023

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Research on the mechanical properties and damage evolution of coal during true triaxial cyclic loading and unloading is of great significance for maintaining the long-term safety and stability of underground engineering structures in coal mines. In this paper, firstly, the deformation, strength and fracturing characteristics of coal during true triaxial loading and true triaxial cyclic loading and unloading were analyzed. Then, the residual strain characteristics, energy distribution and evolution of coal were systematically studied. Additionally, the damage evolution laws of coal during cyclic loading and unloading were quantitatively analyzed from the perspectives of residual strain and energy dissipation, respectively. The damage evolution law based on residual strain showed that when the intermediate principal stress was high, the damage to coal was directional. With the increase in cyclic load, the coal damage variables in the directions of σ1 and σ3 increased exponentially, while that in the direction of σ2 increased quadratically. The damage evolution law based on energy dissipation showed that the coal damage variable increased exponentially with the increase in cyclic load. With the increase in σ2, the increasing speed of coal damage variable decreased first and then increased. The damage variables established based on residual strain and energy dissipation can both reveal the damage deterioration mechanism of coal during true triaxial cyclic loading and unloading, which is of great theoretical and engineering significance for scientifically evaluating the stability of underground coal and rock engineering and preventing the occurrence of major geological disasters.

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“…M. W. Zhang et al [36,37] believed that the Felicity effect of rock in the elastic phase of rock deformation decreases as the unloading rate increases. D. X. Liang et al [38,39] analyzed the Kaiser effect under cyclic loading and unloading on rocks, and found that the greater the rock hardness is, the earlier the Kaiser stress point appears. The Kaiser effect is more obvious under stepped cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Acoustic Emission Characteristics of Unloading Instability of Sandstone under High Stress

et al. 2022

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In order to analyze the law of unloading instability of deep rock mass, the unloading experiment of sandstone under different confining pressures was carried out, and the mechanical properties and acoustic emission characteristics of sandstone unloading failure under high stress were obtained. The results demonstrate that before unloading, the sandstone under low stress shows compression and elastic deformation, whereas that under high stress shows elastic deformation and plastic deformation. Moreover, the unloading behavior of sandstone under low stress is ductile, whereas that under high stress is brittle. Poisson’s ratio and elastic modulus have negative and positive correlation with initial confining pressure, respectively. During unloading, the higher the initial confining pressure is, the earlier the rock sample damage occurs. Prior to the accelerated damage stage, the unloading amount and AE cumulative count are inversely proportional and directly proportional to the initial confining pressure, respectively. The simultaneous occurrence of UHF, HF, MF, and LF in the AE power spectrum, as well as a steep increase in fractal dimension followed by a decrease, can be used as precursors to unloading instability in sandstone.

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Damage and fractal evolution trends of sandstones under constant-amplitude and tiered cyclic loading and unloading based on acoustic emission

Cited by 20 publications

References 35 publications

Comprehensive review of geomechanics of underground hydrogen storage in depleted reservoirs and salt caverns

Comprehensive review of geomechanics of underground hydrogen storage in depleted reservoirs and salt caverns

Experimental Study on Mechanical and Damage Evolution Characteristics of Coal during True Triaxial Cyclic Loading and Unloading

Mechanical Properties and Acoustic Emission Characteristics of Unloading Instability of Sandstone under High Stress

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