Research on non-linear characteristics of rock energy evolution under uniaxial cyclic loading and unloading conditions

Meng, Qinglin; Zhang, Mingwei; Zhang, Zhizheng; Han, Lijun; Pu, Hai

doi:10.1007/s12665-019-8638-9

Cited by 37 publications

(22 citation statements)

References 28 publications

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“…The maximums proportion of elastic energy density is very close to 1.0 when the temperature is less than 400 °C, while its value is about 0.8 in the temperature range of 400-800 °C. The stiffer the rock is, the higher the potential of energy accumulation at the pre-peak stage is [10]. The results indicate that sandstone stiffness decreases with the rising of the temperature.…”

Section: Energy Evolution Lawmentioning

confidence: 89%

“…From the literature review, the current researches mainly focus on the traditional mechanics analysis. The deformation and failure process of rock present complexity, fuzziness and uncertainty due to the heterogeneity and discontinuous microstructure of rock [9,10]. The nature of rock failure is a process of the energy accumulation, energy dissipation, and energy release [11].…”

Section: Introductionmentioning

confidence: 99%

“…2. Based on the thermodynamics, the dissipated energy is irreversible, while the elastic energy is reversible[10]. Fromfig.…”

mentioning

confidence: 99%

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Effect of thermal cycling on mechanical properties and energy evolution of sandstone

et al. 2020

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In geothermal energy exploration, the reservoir rock is always subjected to thermal cycles and its physical properties will be seriously affected. In this paper, the changes of the internal structure of the sandstone after the thermal cycle are firstly evaluated by ultrasonic tests. Then, uniaxial compression tests are conducted on the treated specimens. The effects of the thermal cycling on mechanical properties and energy evolution law of the sandstone are analyzed. The results show that the density, P-wave velocity and mechanical properties of the sandstone reduced with the increase in the thermal cycle, especially in the high temperature cycle. The increase of the temperature in the thermal cycle can increase the influence of the thermal cycle on the energy evolution law.

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Section: Energy Evolution Lawmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Effect of thermal cycling on mechanical properties and energy evolution of sandstone

et al. 2020

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“…Peng et al [7] proposed a strength criterion and brittleness indexes based on energy release and dissipation. Meng et al [8,9] studied the effect of different loading rates on the energy evolution of sandstone. Zhang et al [10,11] studied the chaotic characteristics of energy evolution during uniaxial compression and proposed the energy criterion of rock failure and instability.…”

Section: Introductionmentioning

confidence: 99%

Energy evolution and distribution law of rock under thermal mechanical coupling

et al. 2022

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The characteristics of the energy evolution and distribution of rock during deformation and failure were studied based on thermal mechanical coupling tests completed by Min Ming at his Master?s thesis in 2019. Dissipated energy is greater than elastic energy at the crack closure stage, while elastic energy is dominant at the linear elastic stage. At the post-peak failure stage, elastic energy is released rapidly before 800?C and released slowly at 1000?C. A comprehensive evaluation index to examine the influence of temperature on rock strength and deformation ability was proposed from the perspective of elastic energy accumulation ability. The negative effect of temperature on the strength of the rock sample is weaker than that on the elastic modulus before 400?C. The negative effect of temperature on the strength of the rock sample is stronger than that on the elastic modulus after 600?C.

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“…e results showed that, compared with the conventional uniaxial loading condition, the maximum deformation before failure under the cyclic loading condition is greater, and Young's modulus increases quadratically with the cycle index. Meng et al [20,21] conducted uniaxial cyclic loading and unloading tests on yellow sandstone, red sandstone, limestone, and marble by employing the MTS 815 rock mechanics test system. ey analyzed and summarized the evolution law of cyclic acoustic emission of stress-strain changes of different rocks in loading and unloading stages.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Mechanical Properties and Acoustic Emission Characteristics of Water Bearing Sandstone under Stable Cyclic Loading and Unloading

Qin

Zhou

2020

Shock and Vibration

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Due to the adjustment of energy structure, a large number of coal mines are abandoned. Considering the environmental and economic effects, many experts proposed to use the abandoned mine cavern as the reservoir of the pumped storage power station. Furthermore, considering the long-term effects of repeated pumping and drainage and hydrodynamic pressure on the surrounding rock in coal mines, a large amount of sandstone was collected from the Ruineng coal mine in Yan’an city to carry out a series of laboratory tests. Through uniaxial compression testing of rock samples with different water content rates, combined with acoustic emission (AE) analysis, the strength softening and macrodeformation characteristics are obtained, and the influence of water content on acoustic emission characteristics is clarified. The mechanical properties of water bearing rock under cyclic loading and unloading experiments with varying upper limits are obtained using a triaxial test system, and the precursory information of rock failure is captured, providing significant guidance for stability analysis and instability warning for surrounding rock in pumped storage power stations.

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Research on non-linear characteristics of rock energy evolution under uniaxial cyclic loading and unloading conditions

Cited by 37 publications

References 28 publications

Effect of thermal cycling on mechanical properties and energy evolution of sandstone

Effect of thermal cycling on mechanical properties and energy evolution of sandstone

Energy evolution and distribution law of rock under thermal mechanical coupling

Experimental Study on Mechanical Properties and Acoustic Emission Characteristics of Water Bearing Sandstone under Stable Cyclic Loading and Unloading

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