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Moment Tensor Inversion and Stress Evolution of Coal Pillar Failure Mechanism

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Abstract

Irregular coal pillars left in longwall working faces are prone to stress concentration, resulting in failure and instability of coal pillar. Revealing the failure mechanism of the coal pillars is essential for the accurate prevention of coal pillar-type rockburst. Based on the geological conditions and the residual coal pillars in the 14320 working face of the Dongtan coal mine, this study investigates the failure mechanism and stress evolution characteristics in the abnormal area with irregular coal pillars through microseismic (MS) monitoring, moment tensor inversion, and velocity tomography of MS. The results show that (1) the MS events at the edge of the coal pillars are significantly more greater than those in the core area, in which, failure types of tension and compression occur in the edge and core areas, respectively; (2) the spatial parameters (strike φ, dip angle δ, slip angle γ) of the failure plane in the irregular coal pillar area were determined. The boundary of the irregular coal pillars was dominated by reverse fault sliding, and the core area is dominated by normal fault sliding; and (3) the stress field distribution characteristics of the working face and irregular coal pillars were determined using P-wave velocity tomography. The research findings provide a reference for analyzing the mechanisms of coal pillar failure, instability and the induced rockbursts.

Highlights

  • Moment tensor theory is used to analyze the fracture mechanism of coal pillar in mines.

  • Moment tensor theory reveals rupture types and occurrence of the rupture face in different regions of coal pillar.

  • Stress evolution law of coal pillar is obtained by microseismic velocity tomography.

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Acknowledgements

We acknowledge the collaborative funding support from the National Natural Science Foundation of China (51574225, 52104102). The data used in this study are available from the authors.

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Authors and Affiliations

  1. Key Laboratory of Deep Coal Resource Mining (Ministry of Education), School of Mines, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, People’s Republic of China

    Chun-Hui Song & Cai-Ping Lu

  2. Centre of Rockburst Prevention Research, Shandong Energy Group, Jinan, 250014, Shandong, People’s Republic of China

    Xiu-Feng Zhang & Chao Wang

  3. Dongtan Coal Mine, Yanzhou Coal Mining Company Limited, Zoucheng, 273513, Shandong, People’s Republic of China

    Hua-Dong Xie & Xian-Yang Yan

  4. School of Civil Engineering, Sun Yat-Sen University, Guangzhou, 510275, Guangdong, People’s Republic of China

    Hong-Wei Yang

Authors
  1. Chun-Hui Song
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  2. Cai-Ping Lu
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  3. Xiu-Feng Zhang
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  4. Chao Wang
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  5. Hua-Dong Xie
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  6. Xian-Yang Yan
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  7. Hong-Wei Yang
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Correspondence to Cai-Ping Lu.

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Song, CH., Lu, CP., Zhang, XF. et al. Moment Tensor Inversion and Stress Evolution of Coal Pillar Failure Mechanism. Rock Mech Rock Eng 55, 2371–2383 (2022). https://doi.org/10.1007/s00603-022-02783-1

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  • DOI: https://doi.org/10.1007/s00603-022-02783-1

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