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Mechanism of Rock Burst Occurrence in Specially Thick Coal Seam with Rock Parting

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Abstract

Specially thick coal seam with complex construction, such as rock parting and alternative soft and hard coal, is called specially thick coal seam with rock parting (STCSRP), which easily leads to rock burst during mining. Based on the stress distribution of rock parting zone, this study investigated the mechanism, engineering discriminant conditions, prevention methods, and risk evaluation method of rock burst occurrence in STCSRP through setting up a mechanical model. The main conclusions of this study are as follows. (1) When the mining face moves closer to the rock parting zone, the original non-uniform stress of the rock parting zone and the advancing stress of the mining face are combined to intensify gradually the shearing action of coal near the mining face. When the shearing action reaches a certain degree, rock burst easily occurs near the mining face. (2) Rock burst occurrence in STCSRP is positively associated with mining depth, advancing stress concentration factor of the mining face, thickness of rock parting, bursting liability of coal, thickness ratio of rock parting to coal seam, and difference of elastic modulus between rock parting and coal, whereas negatively associated with shear strength. (3) Technologies of large-diameter drilling, coal seam water injection, and deep hole blasting can reduce advancing stress concentration factor, thickness of rock parting, and difference of elastic modulus between rock parting and coal to lower the risk of rock burst in STCSRP. (4) The research result was applied to evaluate and control the risk of rock burst occurrence in STCSRP.

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Abbreviations

σ 0 :

Original rock stress value

σ min :

Valley stress near the junction point of coal and rock parting

σ max :

Peak stress near the junction point of coal and rock parting

σ g :

Stable stress inside rock parting

M :

Thickness of coal seam

d 0 :

Settlement of coal seam in the original rock stress zone

d 1 :

Settlement of coal seam near the peak stress zone

E 0 :

Elasticity modulus of coal

γ :

Average bulk density of overlying rock

H :

Mining depth

h :

Thickness of rock parting

E 1 :

Elasticity modulus of rock parting

σ′(x):

Peak value of advancing superimposed stress

σ(x):

Primary stress at the location of advancing peak stress

△σ :

Advancing stress increment caused by mining

α :

Advancing stress concentration factor of the mining face

τ :

Maximum shear force

[τ]:

Shear strength of coal seam

σ 1 :

Maximum principal stress

σ 3 :

Minimum principal stress

DT:

Duration of dynamic fracture

W ET :

Elastic strain energy index

K E :

Bursting energy index

R C :

Uniaxial compressive strength

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Acknowledgments

This work was supported and financed by the National Basic Research Program of China (No. 2010CB226803), the National Natural Science Foundation of China (No. 51274022, No. 51174016).

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Authors and Affiliations

  1. Department of Mining Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Jian-chao Wang, Fu-xing Jiang, Si-tao Zhu & Yu Feng

  2. Yankuang Group Limited Company, Zoucheng, 273500, Shandong, China

    Xiang-jun Meng & Xu-you Wang

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  1. Jian-chao Wang
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  2. Fu-xing Jiang
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  3. Xiang-jun Meng
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  5. Si-tao Zhu
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Correspondence to Jian-chao Wang.

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Wang, Jc., Jiang, Fx., Meng, Xj. et al. Mechanism of Rock Burst Occurrence in Specially Thick Coal Seam with Rock Parting. Rock Mech Rock Eng 49, 1953–1965 (2016). https://doi.org/10.1007/s00603-015-0894-8

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  • DOI: https://doi.org/10.1007/s00603-015-0894-8

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