Characteristics of energy storage and dissipation of coal under one‐time cyclic load

Energy Science and Engineering - Tập 8 Số 9 - Trang 3117-3135 - 2020
Kang Peng1, Shaowei Shi1, Quanle Zou1, Junhui Mou1, Jin Yu2, Yongjiang Zhang3, Yanying Cheng4,5
1State Key Laboratory of Coal Mine Disaster Dynamics and Control, School of Resources and Safety Engineering, Chongqing University, Chongqing, China
2Fujian Research Center for Tunnelling and Urban Underground Space Engineering, Huaqiao University, Xiamen, China
3Gas Prevention and Control Branch, Chongqing Research Institute, China Coal Technology Engineering Group, State Key Laboratory of the Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing, China
4Faculty of Geosciences and Environmental Engineering, Southwest of Jiaotong University, Chengdu, China
5Sichuan Science and Construction Coal Industrial Technology Research Institute Co., Ltd., Chengdu, China

Tóm tắt

AbstractEnergy is an important research parameter in rock mechanics. To explore the law of energy evolution of coal, a one‐time loading and unloading test under uniaxial compression was conducted on coal taken from four different coal mines. By utilizing the area integral method, the total input, elastic, and dissipated energy densities in coal at different unloading levels were calculated. The correlation between various energy densities and the evolution law of energy density with different unloading levels was attained. The peak strengths of the coal slowly declined with an increasing unloading level, which conforms to the relation of a linearly decreasing function. The energy dissipation rate has nonlinear characteristics, and the shape of the dissipation rate fitting curve changed from an upper concave to a downward concave with increasing strength. In all the coal samples, the energy density grew nonlinearly with the unloading level. Moreover, the growth rate of the total energy density was the highest, followed by the growth rates of the elastic and dissipated energy densities. All ratios of the elastic and dissipated energy densities to the total input energy density and the ratio of the dissipated energy density to the elastic energy density were constant. As the strength increased, the input energy and the elastic energy density increased at a faster rate, and they observed the same law. There is an insignificant relationship between the degree of destruction of the coal and the level of unloading. Energy is a major factor that drives the failure of a test piece, but this is not the main factor that determines the degree of damage to the test piece.

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Energy Science and Engineering

Tập 8 Số 9

3117-3135

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