Backfill grouting for mining subsidence prevention

Paper


Alehossein, Habib, Shen, Baotang and Qin, Zongyi. 2021. "Backfill grouting for mining subsidence prevention." Aziz, Naj and Mirzaghorbanali, Ali (ed.) 2021 Resource Operators Conference (ROC2021). Springfield, Australia 10 - 12 Feb 2021 Wollongong, Australia.
Paper/Presentation Title

Backfill grouting for mining subsidence prevention

Presentation TypePaper
AuthorsAlehossein, Habib (Author), Shen, Baotang (Author) and Qin, Zongyi (Author)
EditorsAziz, Naj and Mirzaghorbanali, Ali
Journal or Proceedings TitleProceedings of the 2021 Resource Operators Conference
Number of Pages12
Year2021
Place of PublicationWollongong, Australia
ISBN9781741283358
9781741283365
Web Address (URL) of Paperhttps://ro.uow.edu.au/cgi/viewcontent.cgi?article=2473&context=coal
Conference/Event2021 Resource Operators Conference (ROC2021)
Event Details
2021 Resource Operators Conference (ROC2021)
Parent
Resource Operators conference
Event Date
10 to end of 12 Feb 2021
Event Location
Springfield, Australia
Abstract

Mining subsidence has been a major hazard in most underground coal mines, particularly those designs and practices based on the wrong assumption of fixed, permanent and nondeteriorating coal pillars. Mining induced subsidence significantly affects mining costs where major surface structures and natural environment need to be protected. Remedial measures to manage damage caused by subsidence can often be very costly with potentially damaging impacts and irreversible consequences. Backfilling and injection of granular materials into the mining induced voids, separated beddings and cracks, as either diluted granular slurry or concrete paste, is widely used to control mine subsidence. Granular grouts and slurries made of mine and power plant wastes and rejects are viable environmental backfill solutions to both ground stability and mine waste management problems. Like concrete paste, the flowing slurry can be categorised as a generally nonlinear frictional viscous cohesive (Bingham Herschel-Bulkley) fluid. The general frictional viscous, cohesive, non-Newtonian fluid model has been applied to concrete flowability problems such as L-box and slump tests. While slump test is used in shallow foundations, L-box test is used in difficult deep foundations. It is designed to measure workability and flowability of tremie pipe concrete as an indirect index measure of concrete viscosity and plastic yield. Tremie pipes are used to control concrete flow rate and minimise bleeding and dilution when placed into deep submerged excavations. Mathematical and experimental models have been developed to not only solve the flow velocity along the L-box channel length as a function of time and distance, but also simulate the flow of the backfill material and demonstrate the detailed process of filling the voids to minimise any further subsidence.

Keywordsgrouting; mining
ANZSRC Field of Research 2020401212. Non-Newtonian fluid flows (incl. rheology)
401905. Mining engineering
Public Notes

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Byline AffiliationsSchool of Civil Engineering and Surveying
Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australia
Institution of OriginUniversity of Southern Queensland
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