Abstract: Surrounding rock control in the overlying protected coal seam is a challenging topic of de-stressed mining of multi-seams．Based on current research on roadway control，a numerical simulation model was established to study stress field and fissure field before and after roadway excavation during underlying mining．Meantime，a physical simulation mode with the complex textured-roof and varying thickness was used to study roadway instability and collapse caused by dynamic pressure as well．The results show that when thickness of the roof is bigger than that of the bolted depth. The roadway situation is in the worst and the roof has the greatest possibility to lose its stability．Then a series of control principles have been proposed，such as strengthening roof，reinforcing both sides，strengthening the key area and strengthening bolted area．Therefore, combined supporting technique of tridimensional cable bolt beam structure based on new “three-high” bolt has been put them into practice finally，which showed that a better supporting effect was obtained．

Key words: ascending mining；roof roadway；new “three-high&rdquo, bolt；tridimensional cable bolt beam structure