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Investigation of Fault Displacement Evolution During Extraction in Longwall Panel in an Underground Coal Mine

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Abstract

A physical simulation model is constructed to study the characteristics of fault displacement evolution at Yima mining area, Henan Province, China. The geological condition at Yima mining area is complicated with high in situ stress, reverse faults and extremely thick conglomerate rock strata. In this study, the fault movement process during extraction of a coal seam is simulated and the precursory information on the fault slip is investigated. The fault displacement and shear stress, as well as the fault slip location are monitored in the simulation using digital speckle image correlation method, shear stress sensors, and acoustic emission monitoring. The investigations reveal the following: a relatively long suspension prior to the sharp increase in acoustic emission events might be used as the precursory information on an impending fault slip; the combined effect of the fault slip and extremely thick conglomerate rock strata may induce coal bursts; the interaction zone of thick conglomerate rock strata and fault structure is a high-risk region that can induce fault slips.

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Abbreviations

\(C\) :

Similarity coefficient

\(C_{\text{L}}\) :

Similarity coefficient of model geometry

\(C_{\sigma }\) :

Similarity coefficient of material strength

\(C_{\rho }\) :

Similarity coefficient of material density

\(L_{\text{p}}\) :

Prototype geometry

\(\sigma_{\text{p}}\) :

Prototype strength

\(\rho_{\text{p}}\) :

Prototype density

\(L_{\text{m}}\) :

Model geometry

\(\sigma_{\text{m}}\) :

Model strength

\(\rho_{\text{m}}\) :

Model density

\(\varepsilon_{x}\) :

Normal strain in x direction

\(\varepsilon_{y}\) :

Normal strain in y direction

\(\gamma_{zy}\) :

Shear strain on area SABFE

\(\varepsilon_{0^\circ }\) :

Normal strain monitored from strain sheet at 0° direction

\(\varepsilon_{45^\circ }\) :

Normal strain monitored from strain sheet at 45° direction

\(\varepsilon_{90^\circ }\) :

Normal strain monitored from strain sheet at 90° direction

l, m :

Directional cosine of vector

\(l_{0^\circ }\), \(m_{0^\circ }\) :

Directional cosine of vector at 0°

\(l_{45^\circ }\), \(m_{45^\circ }\) :

Directional cosine of vector at 45°

\(l_{90^\circ }\), \(m_{90^\circ }\) :

Directional cosine of vector at 90°

E :

Young’s modulus of gypsum elementary block

G :

Shear modulus of gypsum elementary block

\(\mu\) :

Poisson’s ratio of gypsum elementary block

\(\sigma\) :

Normal stress on fault plane

\(\tau\) :

Shear stress on fault plane

AE:

Acoustic emission

AE-1 to AE-6:

Acoustic emission monitoring sensors no. 1 to no. 6

F16 :

Thrust fault in Yima mining area

PCI-2:

Acoustic emission system

S-1 to S-8:

Stress sensors no. 1 to no. 8

UCS:

Uniaxial compressive strength

YDM-C:

Geological disaster simulation testing machine

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Acknowledgements

This research was financially supported by the National Natural Science Foundation of China (41872205), the Yue Qi Young Scholar Project, China University of Mining &Technology, Beijing (2018QN13), the State Key Research Development Program of China (2016YFC0801401, 2017YFC0603002), the State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology in Beijing (SKLGDUEK1722) and the Excellent Talent Training (2016000020124G115).

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Authors and Affiliations

  1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing, 100083, China

    Hongwei Wang & Weili Gong

  2. School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing, 100083, China

    Hongwei Wang, Ruiming Shi, Yaodong Jiang, Weili Gong & Lingtao Mao

  3. Anhui University of Science and Technology, Huainan, 232002, China

    Sheng Xue

  4. State Key Laboratory for Mining Response and Hazard Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan, 232002, China

    Sheng Xue

  5. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing, 100083, China

    Yaodong Jiang & Lingtao Mao

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  1. Hongwei Wang
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Correspondence to Hongwei Wang.

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Wang, H., Xue, S., Shi, R. et al. Investigation of Fault Displacement Evolution During Extraction in Longwall Panel in an Underground Coal Mine. Rock Mech Rock Eng 53, 1809–1826 (2020). https://doi.org/10.1007/s00603-019-02015-z

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