Energy Dissipation-Based Method for Strength Determination of Rock under Uniaxial Compression

He, Mingming; Pang, Fan; Wang, H. T.; Zhu, Jiwei; Chen, Y. S.

doi:10.1155/2020/8865958

Cited by 10 publications

(12 citation statements)

References 38 publications

(38 reference statements)

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“…Under dynamic loads, rock damage or fracture may occur and energy consumption happens [5][6][7]. Accordingly, it is of importance to investigate energy dissipation in the process of rock fracture [8][9][10][11][12][13][14][15]. Under static loads, experimental studies have confirmed that the deformation and failure of rock is a process of energy input, dissipation, and release.…”

Section: Introductionmentioning

confidence: 99%

Energy Dissipation and Particle Size Distribution of Granite under Different Incident Energies in SHPB Compression Tests

Gong

Jia

Zhang

et al. 2020

Shock and Vibration

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To investigate energy dissipation and particle size distribution of rock under dynamic loads, a series of dynamic compression tests of granite specimens were conducted using a conventional split-Hopkinson pressure bar (SHPB) device with a high-speed camera. The experimental results show that the dissipated energy increases linearly with an increasing incident energy, following two different inclined paths connected by a critical incident energy, and the linear energy dissipation law in the dynamic compression test has been confirmed. This critical incident energy was found to be 0.29–0.33 MJ/m3. As the incident energy was smaller than the critical incident energy, the rock specimens remained unruptured after the impact. When the incident energy was greater than the critical incident energy, the rock specimens were ruptured or fragmented after the impact. In addition, the experimental results indicate that the dissipated energy and energy consumption ratio of a rock specimen, either unruptured or fragmented, increase with an increasing strain rate. Furthermore, it was found that fragment sizes at each mesh decrease with an increasing incident energy; that is, fragmentation becomes finer as incident energy increases.

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Section: Introductionmentioning

confidence: 99%

Energy Dissipation and Particle Size Distribution of Granite under Different Incident Energies in SHPB Compression Tests

Gong

Jia

Zhang

et al. 2020

Shock and Vibration

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“…It is expected that when external load is applied on rock sample no heat is lost [33,34], according to the first law of thermodynamics the total energy is derived using Equation (1).…”

Section: Rock Failure Modesmentioning

confidence: 99%

Influence of chemical composition and discontinuities on energy transformation and rock mass behaviour: Insights into geological dynamic

Abbas,

Li,

Fissha

et al. 2024

The Journal of Engineering

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In this study, efforts were made to incorporate the influence of discontinuities and failure modes of rock into the classification of rock masses. The past tectonic activities may create microfractures in the rock body therefore the failure moods have been determined carefully under uniaxial compression. The results of the discontinuity analysis, conducted through kinematic study, highlighted the significant impact of wedge failure on the failure of the rock mass. In correlating the geological strength index with rock mass rating, it was observed that joint volume played a negative role, whereas compressive strength played a positive role. These correlations are particularly applicable for a certain rock type, as the compressive strength is inherently dependent on the type of rock. The analysis of failure modes under uniaxial compression reveals that the dissipation energy coefficient initially undergoes rapid increase before reaching its minimum value at the failure stage. The microstructures of the rock effect significantly the elastic and dissipation energy characteristics. Specifically, the axial splitting failure mode emerges as predominant. Given the area's past tectonic activity, these results emphasize the impact of microfractures within the rock body. Relating the failure criteria with the chemical composition of rock types reveals that rocks abundant in SiO2, such as gabbronorite, tend to exhibit brittle failure. Additionally, a dominance of Al2O3 over Fe2O3 suggests a predisposition towards brittle failure, while an increased ratio of CaO to MgO implies increased susceptibility to compression.

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“…e results are closer to the nature of rock damage by exploring the damage evolution during rock loading from the perspective of energy dissipation. He et al [14] introduced the dissipated energy coefficient to study the energy evolution characteristics of rocks and proposed a method to determine the rock burst proneness and crack propagation in rocks. Liu et al [15] established a damage constitutive model of rocks from the perspective of dissipated energy to describe the behavior of rocks under cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

Energy Dissipation and Damage Evolution Characteristics of Shale under Triaxial Cyclic Loading and Unloading

Xie

Song

et al. 2022

Advances in Materials Science and Engineering

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Rock engineering is highly susceptible to cyclic loads resulting from shale gas exploitation; it is very important to study the failure mechanism of underground rock mass under cyclic load. To investigate the energy dissipation and damage evolution characteristics of shale under triaxial cyclic loading and unloading conditions, a series of triaxial incrementally cyclic loading and unloading tests under different confining pressures (10 MPa, 15 MPa, 20 MPa, and 30 MPa) were carried out. The variation of plastic strain of shale under four confining pressures was analyzed, and the evolution characteristics of dissipated energy and energy dissipation ratio were discussed. The results show that: the peak strength and peak strain of shale increase with the increase in confining pressures. Meanwhile, the plastic strain of rock under cyclic loading increases rapidly first, then develops steadily, and finally increases sharply with the increase in axial strain. The energy dissipation ratio-strain curve presents a spoon-shaped evolution feature, and can be divided into three stages: a linear decline stage, a steady development stage, and a rapid increase stage, respectively. However, the trend of elastic modulus of shale was opposite to that of the energy dissipation ratio. Accordingly, the energy dissipation ratio can be regarded as the damage factor to describe the degradation of shale. Based on the evolution of dissipated energy, a theoretical equation of shale stress-strain evolution was established. By substituting the test data into the formula, it is found that the calculated results are basically consistent with the test data, and the peak strains and peak stress calculated by the equation are in good agreement with the test data. The findings could provide important theoretical support for the energy dissipation and damage evolution analysis in the failure process of shale under cyclic stress conditions.

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Energy Dissipation-Based Method for Strength Determination of Rock under Uniaxial Compression

Cited by 10 publications

References 38 publications

Energy Dissipation and Particle Size Distribution of Granite under Different Incident Energies in SHPB Compression Tests

Energy Dissipation and Particle Size Distribution of Granite under Different Incident Energies in SHPB Compression Tests

Influence of chemical composition and discontinuities on energy transformation and rock mass behaviour: Insights into geological dynamic

Energy Dissipation and Damage Evolution Characteristics of Shale under Triaxial Cyclic Loading and Unloading

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