Vertical stress and stability of interburden over an abandoned pillar working before upward mining: a case study

Authors

Jinwen Bai, Taiyuan University of Technology
Guorui Feng, Taiyuan University of TechnologyFollow
Shanyong Wang, The University of Newcastle
Tingye Qi, Taiyuan University of Technology
Jian Yang, West Virginia University
Jun Guo, Taiyuan University of Technology
Zhen Li, Taiyuan University of Technology
Xianjie Du, Taiyuan University of Technology
Zehua Wang, Taiyuan University of Technology
Yunlou Du, Taiyuan University of Technology
Yujiang Zhang, Taiyuan University of Technology

Author ORCID Identifier

https://orcid.org/0000-0002-7357-8888

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Document Type

Article

Publication Date

2018

College/Unit

Statler College of Engineering and Mining Resources

Department/Program/Center

Mining Engineering

Abstract

Upward mining of the residual coal seam over an abandoned pillar working is one of the effective measures to alleviate the contradiction between limited resources and increased consumption. Interburden stability over an abandoned pillar working plays a significant role in guaranteeing the safety of upward mining; however, it has not yet been extensively studied and understood. In this study, the vertical stress of the interburden over an abandoned pillar working was first investigated. The mechanical model of the interburden was established and the damage conditions were analysed. Then, the stability of the interburden over 38502 abandoned workings in Baijiazhuang coal mine was determined by mechanical analysis and field monitoring. The results show that: (i) Vertical stress of the interburden over abandoned mining zones is clearly lower than the initial stress, indicating the existence of a de-stressed effect. Moreover, vertical stress of the interburden over residual coal pillars is greater than the initial stress, which is the evidence of a stress 2 concentration effect. (ii) The interburden over an abandoned pillar working should be regarded as an elastic rectangular plate supported by generalized Kelvin bodies in mechanical modelling. (iii) The interburden over abandoned mining zones may experience two damage stages. In the first stage, initial plastic damage appears at the central region of interburden. In the second stage, the plastic damage evolves from the central point to the surrounding areas. (iv) The mechanical analysis and field monitoring both indicate the initial damage occurred at the central region over 38502 abandoned workings in Baijiazhuang coal mine before upward mining. Related rock control measures should be implemented in that region to guarantee the safe mining of the residual coal seam.

Digital Commons Citation

Bai, Jinwen; Feng, Guorui; Wang, Shanyong; Qi, Tingye; Yang, Jian; Guo, Jun; Li, Zhen; Du, Xianjie; Wang, Zehua; Du, Yunlou; and Zhang, Yujiang, "Vertical stress and stability of interburden over an abandoned pillar working before upward mining: a case study" (2018). Faculty & Staff Scholarship. 1518.
https://researchrepository.wvu.edu/faculty_publications/1518

Source Citation

Bai J et al. 2018 Vertical stress and stability of interburden over an abandoned pillar working before upward mining: a case study. R. Soc. open sci. 5: 180346. http://dx.doi.org/10.1098/rsos.180346

Comments

2018 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.