Document Type

Conference Paper

Publication Date


Publication Details

Ali Akbar Sahebi and Hossein Jalalifar, Finite difference modelling in underground coal mine roadway, in Naj Aziz and Bob Kininmonth (eds.), Proceedings of the 17th Coal Operators' Conference, Mining Engineering, University of Wollongong, 8-10 February 2017, 108-116.


This paper presents stability analysis of roadways of the Tabas coal mine in Iran. Tabas Coal Mine is the first fully mechanised coal mine in Iran, producing 1.5 million tons of coal per year. The mine extracts coal by both longwall and room and pillar methods. The results gathered from field investigations and the geomechanical properties of rocks, were determined in the laboratory and indicate that the rock masses of this area are weak. So, the excavated roadways need to have suitable support. For this purpose, the roadways were modeled with FLAC-2D software. The Finite Difference Method (FDM) models were calibrated to study the interaction between rock mass and support. The use of V29 and V36 section arches are under consideration. After modelling these roadways in FLAC2D software the results achieved from this model show that; displacements of around the roadways are high and safety factors are very low, so roadways need to be support. The extracted results from this software show that; steel arch V36 with a spacing of 1m is the best support system for these roadways. With this type of support system, displacements around the roadway are low and safety factors are in suitable values. After installation it was observed that the critical strain values on roadway walls and roof were less than the permitted values, which demonstrated the roadway stability.