Deformation Damage and Energy Evolution Characteristics of Coal at Different Depths

Zhang, Zhaopeng; Xie, Heping; Zhang, Ru; Zhang, Zetian; Gao, Mingzhong; Jia, Zheqiang; Xie, Jing

doi:10.1007/s00603-018-1555-5

Cited by 151 publications

(47 citation statements)

References 13 publications

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“…The horizontal stress shows a nonlinear trend with increasing depth. The tectonic movement in the mining area is significant and occurs within the stress field dominated by horizontal structural stress [24]. The original ground temperature of mining face J15-31030 is 45 ℃, and the mine temperature gradient is 2.73 ℃/hm.…”

Section: General Situation Of the Stress Temperature And Gas Fieldsmentioning

confidence: 99%

“…Therefore, exploring the multiphysical field coupling of the temperature field and seepage field under the mining conditions of deep coal mines [11], exploring the migration law THERMAL SCIENCE: Year 2020, Vol. 24,No. 6B, of coal mine gas under the multiphysical field conditions and studying the mutual coupling and interactions of dynamic disaster-inducing factors such as different mining intensities, ground temperatures and gas pressures are urgent.…”

Section: Introductionmentioning

confidence: 99%

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On distribution characteristics of the temperature field and gas seepage law of coal in deep mining

et al. 2020

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The study of gas seepage under the condition of multifield coupling has always been an important topic in coal mining. Based on the theory of multifield coupling and the research method of numerical simulation, the influences of the stress and temperature fields on the seepage field under the conditions of deep coal mining are studied. With the example of the J15-31030 deep working face from mine No. 12 in the Pingdingshan Coal Mine, modeling and finite element analysis are carried out. The influences of the mining stress field and temperature field on the gas seepage field are preliminarily revealed. The results show that the closer to the working face, the greater the velocity of the seepage field is, and the greater the gradient of velocity change. There is a clear negative correlation between the mining stress field and the permeability of the seepage field. The larger the excavation length is, the greater the change gradient of the rock permeability near the working face is. The temperature field has a significant impact on the adsorbed gas in the seepage field. These research results provide the corresponding basis for the safety control and effective mining of coal mine gas.

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Section: General Situation Of the Stress Temperature And Gas Fieldsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On distribution characteristics of the temperature field and gas seepage law of coal in deep mining

et al. 2020

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“…where λ represents the strength-volume rate parameter of particle elements. It is supposed that particle elements exhibited a linear-elastic constitutive relationship, and their energy density is expressed as follows [35]:…”

Section: Calculation Model As Shown Inmentioning

confidence: 99%

“…Combined Body. According to equations (34) and (35), when the inclination α was large, particle elements were easily fractured, which led to a small volume density of unfractured particle elements when the CR combined body was damaged. In addition, in accordance with equations (36) and (37), the energy density of particle elements in the CR combined body showed a quadratic positive correlation with the strength σ cr of a CR combined body when failure occurred.…”

Section: Analysis On Effects Of Inclination On Impact Energy In a Crmentioning

confidence: 99%

Failure Mechanism of a Coal‐Rock Combined Body with Inclinations of Structural Planes and a Calculation Model for Impact Energy

Zhao

Gao

et al. 2019

Advances in Civil Engineering

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A coal-rock (CR) combined body can be used to simulate structures of coal and rock strata, and its impact-induced failure characteristic conforms more close to engineering practice. Exploring the mechanical properties and impact energy in a CR combined body contributes to better predictions of rock bursts in coal mines. In the study, the mechanical properties of CR combined bodies with four different inclinations (0°, 15°, 30°, and 45°) of structural planes were measured, and also their failure mechanism was analysed. Based on the theory of particle mechanics, a calculation model for impact energy in a CR combined body with inclinations was established and then verified by using monitored acoustic emission (AE) data. The test results showed that inclination affected mechanical properties and failure characteristics of the CR combined body, i.e., the larger the inclination, the lower the strength and impact energy in the CR combined body and the lower the level of damage. The proposed calculation model for impact energy revealed the mechanical essence of energy accumulation and release of a CR combined body, providing a reference for investigating rock burst in coal mines.

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“…Scholars have conducted research on rock mechanical properties in various environments [2][3][4][5][6][7][8][9][10][11][12][13]. ey have carried out a lot of research on the physical model [5,[14][15][16][17][18], fractal [19][20][21], acoustic emission [22], energy evolution [23], etc., and they achieved some beneficial results. However, the most prominent surrounding rock environment of the Sichuan-Tibet Railway in China is the high in situ stress.…”

Section: Introductionmentioning

confidence: 99%

Inversion Method of Initial In Situ Stress Field Based on BP Neural Network and Applying Loads to Unit Body

Zhou

et al. 2020

Advances in Civil Engineering

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The initial in situ stress field is the fundamental factor causing the deformation and failure of underground engineering and is an important basis for the feasibility analysis, design, and construction of underground engineering. However, it is difficult to obtain the whole in situ stress field of large-scale underground engineering in difficult and dangerous areas by field measurement. In view of the fact that the measured in situ stress components (σxx, σyy, σzz, τxy, τxz, τyz) of Sichuan-Tibet Railway in China are linear with the buried depth, a method is proposed to solve the in situ stress by applying corresponding loads to all unit bodies in the calculation area based on BP neural network and FLAC3D. Through this method, the in situ stress of the tunnel is inverted. The results show that both the maximum principal stress and minimum principal stress increase with the increase of buried depth, and when the tunnel passes through faults or anticlines, the main stress will suddenly drop. Furthermore, compared with the results of the multiple linear regression method, it is found that the proposed method has higher accuracy; especially for the simulation of the maximum horizontal principal stress and vertical stress, the average relative error is reduced by 26.44% and 77.27%, respectively. The research in this paper can provide a new idea for the initial in situ stress inversion of engineering.

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Deformation Damage and Energy Evolution Characteristics of Coal at Different Depths

Cited by 151 publications

References 13 publications

On distribution characteristics of the temperature field and gas seepage law of coal in deep mining

On distribution characteristics of the temperature field and gas seepage law of coal in deep mining

Failure Mechanism of a Coal‐Rock Combined Body with Inclinations of Structural Planes and a Calculation Model for Impact Energy

Inversion Method of Initial In Situ Stress Field Based on BP Neural Network and Applying Loads to Unit Body

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