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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 4/5
PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE ON CIVIL AND STRUCTURAL ENGINEERING COMPUTING
Edited by: B.H.V. Topping
Paper XV.3

Numerical Requirements for Modelling Fracture Formation in Deep Level Longwall Mining

A.J.L. Crook* and E. Hinton+

*Finite Element Analysis Ltd, Kingston, Surrey
+University College of Swansea, Wales

Full Bibliographic Reference for this paper
A.J.L. Crook, E. Hinton, "Numerical Requirements for Modelling Fracture Formation in Deep Level Longwall Mining", in B.H.V. Topping, (Editor), "Proceedings of the Third International Conference on Civil and Structural Engineering Computing", Civil-Comp Press, Edinburgh, UK, pp 75-82, 1987. doi:10.4203/ccp.4.15.3
Abstract
This paper considers the special facilities required for modelling the formation of fractures in deep level longwall mining using the finite element method. The typical mine geometry and rock type are outlined and the fracturing observed and mapped using stereographic techniques described.

The modelling difficulties encountered with this problem are described, together with the specialized techniques used to overcome them, i.e. infinite elements to represent the elastic rockmass outside the discretised domain, joint elements to represent bedding planes, an element excavation procedure, an excavation closure monitor, a sophisticated material model to reproduce rock fracturing and bedding plane slip.

An example is presented, that utilises the above numerical techniques and shows the importance of modelling the excavation sequence and the influence of full closure on the stress distribution in the rockmass.

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