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Abstract With the deterioration of geological environment，serious disasters increase in deep mining，and many failure phenomena occur in the roadway support，such as caving，floor heave，roof crush and so on. Taking roadway 93up06 in the 9th mining area in Jining coal mine No.2 for example，numerical simulation is used to represent the process of deformation and failure；and four conditions including roof crush，floor heave，axial wedge failure and caving along the structural planes are analyzed. Based on these failure characteristics，an optimized roadway support design is provided. The practice shows that the floor heave can be controlled effectively by changing the cross-section of the roadway，digging out the mudstone in the bottom and using bolts in floor；and then the roof crush and caving can be controlled effectively by modulating the support parameters.
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Received: 19 January 2009
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