Effects of the Length–Diameter ratio on the dissipation energy in the process of rock deformation and failure

Zhao, Zhixin; Yang, Gaosheng; Li, Guiqi; Zhang, Kai

doi:10.1016/j.egyr.2022.10.003

Cited by 7 publications

(5 citation statements)

References 9 publications

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“…The total energy absorption increases continuously under loading, with most of the energy stored as elastic strain energy. At this point, the sample elastic strain energy is the peak elastic strain energy without the limit being reached, so macroscopic failure does not occur [26]. As shown in Figure 11b, after calculating to equilibrium, two types of plastic zones were observed-occurred and occurring shear plastic zones.…”

Section: Discussionmentioning

confidence: 95%

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Laboratory Experimental Study on the Pressure Relief Effect of Boreholes in Sandstone under High-Stress Conditions

Lu,

Jiang,

Wang

et al. 2023

Sustainability

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To study the effects of deep rock drilling pressure relief under high stress conditions in enhanced geothermal systems, two kinds of drilling pressure relief experiments were conducted on sandstone—the staged drilling of pressure relief holes before peak stress and one-time drilling. Pressure relief experiments were carried out on sandstone with two borehole methods of the stage-by-stage drilling and one-time drilling of pressure relief boreholes ahead of the experiments. FLAC3D was used to analyze the plastic zone evolution during drilling and the relationship between stress and plastic zone volume. The results reveal the pre-peak stress change characteristics and pressure relief features of non-prefabricated boreholes under high stress. The experiments show that the staged drilling of pressurized samples involves stages of rapid and gradual decreases in stress, with total relief amplitudes increasing but single-borehole relief decreasing with more holes. Under the same conditions, staged drilling has better relief effects and results in greater energy dissipation, indicating that incremental pre-peak pressure relief is beneficial for reducing the surrounding rock’s impact tendency and improving stability. The research results can provide good guidance and reference for the long-term stability analysis of borehole-containing rock and rock burst hazard control.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Laboratory Experimental Study on the Pressure Relief Effect of Boreholes in Sandstone under High-Stress Conditions

Lu,

Jiang,

Wang

et al. 2023

Sustainability

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“…The load strength is small, and all three forms of energy show an increasing trend. With loading, elastic deformation of the coal occurs, and the mechanical energy was mainly transformed into elastic strain energy [11,34,35]. When the load increases further, the coal undergoes plastic deformation and internal microcracks begin to develop.…”

Section: Energy Evolution Law Of Coal Failurementioning

confidence: 99%

Study on the Energy Evolution Law and Bursting Liability of Coal Failure with Different Joint Inclination Angles

Yin,

Li,

Song

et al. 2024

Applied Sciences

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Joints are the weak plane structures in coal. The existence of joints leads to coal failure, with different fracture modes and energy evolution laws. In this paper, the energy evolution and bursting liability index of coal failure with different joint inclination angles (JIAs) are analyzed. The results show that with an increase in joint inclination angle (JIA), the total energy and elastic energy of coal first decrease and then increase and the dissipation energy decreases gradually. The existence of joints changes the bursting liability of coal. With an increase in the JIA, the uniaxial compressive strength (Rc) of coal first decreases and then increases, the dynamic failure time (DT) gradually decreases, and the impact energy velocity index (WST) and the impact energy index (KE) gradually increase. With an increase in the JIA, coal went from tensile failure to shear failure and tension shear mixed failure. After coal failure, the fractal dimension was between 1.7 and 2.4, decreasing first and then increasing; the larger the JIA and the degree of fragmentation, the more energy consumed at the moment of failure and the stronger the bursting liability of coal. The results have a guiding significance for the monitoring and prevention of rock bursts in coal mines.

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“…Energy dissipation causes damage to the rock mass, which leads to the deterioration of material properties and the loss of strength, while the release of energy causes the overall failure of rock. Many scholars have analyzed the process of rock damage and failure from the perspective of energy [23,24]. Zhang et al [25] put forward a strain energy method under true triaxial compression (TTC), studied the variation law of strain energy characteristics of granite σ2 and σ3 under TTC, and explained the failure process of intact rock well via the energy principle.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Energy Evolution of Sandstone with Different Moisture Content under Uniaxial Compression

Liu,

Zhao,

et al. 2024

Sustainability

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In order to investigate the impact of moisture content on energy evolution, three types of rock samples with varying moisture contents were subjected to uniaxial compression tests. The study aimed to analyze the reasons behind the differences in energy during the deformation process of rocks with different moisture contents. The findings indicate that with increasing moisture content, the peak strength and elastic modulus of the samples decrease. However, the ratio of crack initiation strength σci to peak strength σf shows little effect, primarily because the characteristic strength ratio σci/σf is determined by external loads. The growth rate of elastic energy reaches its maximum value in the early stage of yield, while the proportion of elastic energy reaches its peak value in the later stage of yield. In the deformation and failure process of rocks with varying moisture contents, the increment in elastic performance is smallest in the initial compaction stage for saturated rocks, whereas it is the largest in the yield stage for dry rocks. Additionally, a damage evolution equation based on energy dissipation was established and validated.

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Effects of the Length–Diameter ratio on the dissipation energy in the process of rock deformation and failure

Cited by 7 publications

References 9 publications

Laboratory Experimental Study on the Pressure Relief Effect of Boreholes in Sandstone under High-Stress Conditions

Laboratory Experimental Study on the Pressure Relief Effect of Boreholes in Sandstone under High-Stress Conditions

Study on the Energy Evolution Law and Bursting Liability of Coal Failure with Different Joint Inclination Angles

Experimental Research on Energy Evolution of Sandstone with Different Moisture Content under Uniaxial Compression

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