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Measures to deal roof-shock during tunneling at deep and extra-thick coal

  • Jinxiao Liu
  • Yongle LiuEmail author
  • Wenxin LiEmail author
  • Xinguo Zhang
  • Chengrui Xin
Original Paper
  • 100 Downloads

Abstract

Coalfields in Northwest China are mostly thick or extra-thick coal seams with low strength. During the tunneling of deep full-coal roadway, “roof-shock” may appear to the surrounding coal rock due to distortion and fracture caused by mining, which results in such accidents as roof caving and collapse. This study, taking the ingate connecting roadway of Yili No.1 Coal Mine as an example, discusses the roof-shock phenomenon during excavation. Firstly, the inducing factors of roof-shock are obtained by field monitoring and coal rock burst proneness tests. Next, FLAC3D simulation is employed on the failure characteristics of roof-shock, and on the pressure relief schemes of layered excavation. The modeling results show that the roof-shock aggravates the stress concentration and the damage of surrounding rock in the ingate connecting roadway. Stress distribution can be improved by adopting the layered excavation of the roadway and taking pressure relief and vibration-adsorption support measures. Further, the study creatively puts forward a “four-step” scheme to prevent roof-shock in the deep full-coal roadway, and applies it in the field test of ingate connecting roadway in Yili No.1 Coal Mine. The field monitoring results show that the support measures can effectively control the roof-shock, and the “four-step” scheme is proved a way to solve this problem in deep, extra-thick, and full-coal roadways.

Keywords

Roof-shock Deep coal mining Thick coal seam Full-coal roadway Numerical simulation Support design 

Notes

Funding information

This work was financially supported by Key Laboratory of Deep Coal Mine Excavation Response & Disaster Prevention and Control, Anhui Province (Anhui University of Science and Technology), Huainan, China 232001 (Project No. KLDCMERDPC16101, 01CK05002; Jinxiao Liu, liujinxiao1999@126.com).

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Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  1. 1.College of Mining and Safety EngineeringShandong University of Science and TechnologyQingdaoPeople’s Republic of China
  2. 2.Mine Disaster Prevention and Control-Ministry of State Key Laboratory Breeding BaseShandong University of Science and TechnologyQingdaoPeople’s Republic of China
  3. 3.State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, National Engineering Laboratory for Backfill Coal MiningShandong University of Science and TechnologyQingdaoChina

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