Abstract: The geological conditions of underground soft rock roadway in Baoguo Iron Mine is complicated with broken surrounding rock at the footwall， low compressive strength. It is easy to be broken and swelled when the roadway meets water， which seriously affects the mining and transportation of the mine. In order to reduce the deformation and failure of roadway surrounding rock in the underground mining process of Tiedanshan mining area， improve the stability of underground engineering and maintain the safe and efficient production of the mine， the deformation monitoring of + 35 m horizontal sublevel roadway was carried out， and the related numerical calculation was made by using FLAC3D software. The displacement and plastic zone of the surrounding rock roadway for transportation in the pillarless sublevel caving method with different supporting in Baoguo Iron Mine was analyzed. The results indicated that the strength and bearing capacity of soft rock roadway in this mine can be significantly improved and the failure trend of dynamic pressure at soft rock roadway can be effectively prevented by adopting the combined support means in the key weak and broken area.

Key words: Rock mechanics, Soft rock roadway, Supporting scheme, Deformation monitoring, Numerical simulation