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Deformation Damage and Energy Evolution Characteristics of Coal at Different Depths

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Abstract

As coal mining is extended to greater depths, it is found that the mechanical behavior of deep coal differs from the mechanical behavior of shallow coal, resulting in a significant increase in accidents. To explore the characteristics of deformation damage and energy evolution of coal at different depths, coal samples from depths of 300, 600, 700, 850, and 1050 m at the Pingdingshan Coal Mine were acquired. The effects of depth on the in situ stress environment and physical properties of coal were considered, and triaxial compression experiments on 128 coal samples were conducted on this basis. The results show that as the depth rises up, the elastic modulus of coal gradually increases, reaching a maximum of 6.88 GPa in the range of 700–850 m. Poisson’s ratio, the strength, and the volume strain at failure increase nonlinearly, reaching a maximum of 0.48, 129.7 MPa and 0.81%, respectively, at the depth of 1050 m. With increasing depth, the elastic energy and dissipated energy increase more rapidly, and the corresponding peaks of 1050 m are 1.84 times and 3.1 times that of 300 m, respectively. The dissipated energy causes a more significant internal structural change in deep coal, thereby leading to more prominent macroscopic failure in the deep. From the perspective of energy conversion efficiency, it is mainly the accumulation of elastic energy at the pre-peak stage, followed by the release of elastic energy and a rapid increase in dissipated energy at the post-peak stage. The efficiency of accumulation and release of elastic energy decreases significantly in deep coal, while the generation efficiency of dissipated energy increases sharply. These results provide a useful reference for the safe and efficient exploitation of deep coal resources.

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Abbreviations

E :

Elastic modulus, MPa

E i :

Unloading modulus, MPa

H :

Depth, m

k 1 :

Ratio of maximum horizontal stress to vertical stress, 1

k 2 :

Ratio of minimum horizontal stress to vertical stress, 1

K :

Lateral pressure coefficient, 1

U :

Total energy, J/m3

U e :

Elastic energy, J/m3

U d :

Dissipated energy, J/m3

v p :

Ultrasonic longitudinal wave velocity, m/s

σ v :

Vertical stress, MPa

σ H :

Maximum horizontal stress, MPa

σ h :

Minimum horizontal stress, MPa

σ 1 :

Axial stress, MPa

σ 3 :

Confining pressure, MPa

ε 1 :

Axial strain, 1

ε 3 :

Lateral strain, 1

µ :

Poisson ratio, 1

γ :

Bulk density, kN/m3

SEM:

Scanning electron microscopy

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Acknowledgements

This research was financially supported by the State Key Research Development Program of China (no. 2016YFC0600701), the Major Scientific Research Projects (no. 14H0782) and the China Postdoctoral Science Foundation (2017M610599).

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Authors and Affiliations

  1. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China

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

  2. MOE Key Laboratory of Deep Underground Science and Engineering, Sichuan University, Chengdu, 610065, China

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

  3. College of Water Resource and Hydropower, Sichuan University, Chengdu, 610065, China

    Ru Zhang, Zetian Zhang, Mingzhong Gao, Zheqiang Jia & Jing Xie

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  1. Zhaopeng Zhang
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  2. Heping Xie
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  3. Ru Zhang
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  4. Zetian Zhang
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  7. Jing Xie
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Correspondence to Ru Zhang.

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Zhang, Z., Xie, H., Zhang, R. et al. Deformation Damage and Energy Evolution Characteristics of Coal at Different Depths. Rock Mech Rock Eng 52, 1491–1503 (2019). https://doi.org/10.1007/s00603-018-1555-5

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