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Bearing capacity of rock over mined cavities in Nottingham.

Waltham, AC and Swift, GM 2004, 'Bearing capacity of rock over mined cavities in Nottingham.' , Engineering Geology, 75 (1) , pp. 15-31.

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Abstract

A significant geohazard is created in Nottingham, UK, by hundreds of man-made caves cut in the weak sandstone beneath the city centre. Stability of the caves has been assessed by a single full-scale loading test, by numerical modelling with FLAC and by physical modelling in plaster. For typical caves 4 m wide, bearing capacity of the rock roof rises from 2 MPa where it is 1 m thick to 8 MPa where 3 m thick. Stability decreases over wider caves and where the loading pad edge is over the edge of the cave. Numerical modelling of a very wide cave revealed the failure mechanisms and also showed that an internal support wall increased roof bearing capacity by 50%. Local building regulations that require 3–5 m of rock cover over the sandstone caves appear to be conservative. In stronger rocks, including karstic limestone, a guideline that cover thickness exceeds 70% of the cave width appears to be appropriate.

Item Type: Article
Themes: Subjects / Themes > Q Science > QA Mathematics
Subjects / Themes > T Technology > TN Mining engineering. Metallurgy > TN275 Practical mining operations. Safety measures
Subjects outside of the University Themes
Schools: Colleges and Schools > College of Science & Technology > School of the Built Environment
Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering > Civil Engineering Research Centre
Journal or Publication Title: Engineering Geology
Publisher: Elsevier
Refereed: Yes
ISSN: 0013-7952
Depositing User: H Kenna
Date Deposited: 09 Oct 2007 11:52
Last Modified: 20 Aug 2013 16:50
URI: http://usir.salford.ac.uk/id/eprint/750

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