A meta-analysis of coal mining induced subsidence data and implications for their use in the carbon industry

Mccay, A. T. , Valyrakis, M. and Younger, P. L. (2018) A meta-analysis of coal mining induced subsidence data and implications for their use in the carbon industry. International Journal of Coal Geology, 192, pp. 91-101. (doi:10.1016/j.coal.2018.03.013)

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Abstract

Many empricial subsidence estimation tools exist worldwide but are designed and calibrated for specific coalfields. This paper presents an universal tool for the estimation of maximum subsidence (SMax). The subsidence tool is based on pooling and meta-analysis of empirical data from a number of different countries and coalfields. The key factors influencing SMax are the void dimensions and the mechanical competency of the overburden. These factors are used to estimate subsidence using the empirical equation SMax = [c/(1 + 10^(−a((W/D) − b)))] ∗m, where W is the width of the void, D the depth, m the effective void thickness, and a, b, c are parameters related to the mechanical competency of the overburden. This universial empirical method was validated against historical data from United Kingdom and Australia. The method also provided SMax estimations for underground coal gasification (UCG) projects, that were inline with those from numerical modelling under certain conditions. This tool would likely be most useful when investigating areas, where there are little or no historical data of subsidence and mining. Such areas are most likely to be targeted by UCG schemes.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Valyrakis, Dr Manousos and Mccay, Mr Alistair and Younger, Professor Paul
Authors: Mccay, A. T., Valyrakis, M., and Younger, P. L.
College/School:College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:International Journal of Coal Geology
Publisher:Elsevier
ISSN:0166-5162
ISSN (Online):1872-7840
Published Online:12 April 2018
First Published:First published in International Journal of Coal Geology 192:91-101
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
620171TOPS - TECHNOLOGY OPTIONS FOR COUPLED UNDERGROUND COAL GASIFICATION AND CO2 CAPTURE AND STORAGE (UCG-CCS)Paul YoungerEuropean Commission (EC)608517ENG - ENGINEERING SYSTEMS POWER & ENERGY