A review of overburden fracturing and changes in hydraulic characteristics due to longwall mining

Nourizadeh, Hadi and Canbulat, Ismet and Oh, Joung and Zhang, Chengguo and Aziz, Naj and Mirzaghorbanali, Ali ORCID: https://orcid.org/0000-0002-7967-9233 and McDougall, Kevin ORCID: https://orcid.org/0000-0001-6088-1004 (2020) A review of overburden fracturing and changes in hydraulic characteristics due to longwall mining. In: 2020 Coal Operators' Conference, 12-14 Feb 2020, Wollongong, NSW, Australia.


Abstract

Longwall mining is a major mining method to extract thick, flat-lying and extensive seams. Due to the nature of this mining method, the overlying strata move continuously downwards into goaf and as a result, surrounding rocks are distressed, deformed and fractured. In the near area above the mined coal seam, both vertical and horizontal fracturing networks are evident, however within the higher zones, bed separation and slippage are the dominant displacements. The enhanced cracks alter hydraulic characteristics (porosity and permeability) of the rock mass, consequently disturbing the groundwater and surface water flow regime. There have been various techniques utilised to study mining-induced fracturing mechanisms and changes in water flow systems. They mainly include empirical, physical, analytical and numerical approaches. Of note is that due to the complexity of the issue and difficulties in the implementation of costly and time-consuming in-situ measurements, currently, numerical simulation is a popular approach. The aim of this review paper is to present the current state of the art in mining-induced goaf overburden fracturing and its interaction with groundwater and surface water.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: No paper in these proceedings is to be re-published unless with written permission from the conference organisers and/or the original authors who maintain the copyright for their work.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 01 Oct 2020 05:26
Last Modified: 24 Nov 2021 00:06
Uncontrolled Keywords: long wall mining, hydraulic characteristics, overburden fracturing
Fields of Research (2008): 09 Engineering > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering
09 Engineering > 0914 Resources Engineering and Extractive Metallurgy > 091402 Geomechanics and Resources Geotechnical Engineering
09 Engineering > 0914 Resources Engineering and Extractive Metallurgy > 091405 Mining Engineering
Fields of Research (2020): 40 ENGINEERING > 4005 Civil engineering > 400502 Civil geotechnical engineering
40 ENGINEERING > 4019 Resources engineering and extractive metallurgy > 401902 Geomechanics and resources geotechnical engineering
40 ENGINEERING > 4019 Resources engineering and extractive metallurgy > 401905 Mining engineering
URI: http://eprints.usq.edu.au/id/eprint/39617

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