Abstract：Abstract:Research purposes： The problem of mined out area in railway engineering is the key problem to affect the route scheme，construction and operation safety. The evaluation of the stability of mined out area is still based on the empirical formula. But because it can only be a rough qualitative judgment and can not predict the specific deformation characteristics，and the results also appear relatively rough，it has some limitations. Midas/GTS finite element analysis software can simulate the specific geological conditions and mining conditions， which can predict the deformation characteristics after excavation. Therefore， combinate both of them to research copper mine goaf stability and deformation. The results can reflect the actual，more accurate and more engineering role. Research conclusions:(1) The mining goaf roof rock thickness which make sure railway operational safety is 35. 25 m less than rock thickness near railway line， the surface deformation near the line is almost 0， the railway is in safe condition from the existing position. (2) The 2 methods are validated and complemented with each other，and the results are consistent. The results are more accurate and credible. (3) The research results can directly serve Yuxi - Mohan railway engineering，research method also can be used for the similar engineering stability evaluation of mined out area.
2016, Vol. 33 
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