U steel arch is a kind of passive support of coal mine supporting, high tensile strength, compressive strength, good toughness properties at the same time, support is higher, the supporting intensity big, can be used many times, is widely used in mine roadway, especially in deep roadway and complex soft coal seam roadway.

The best stress state of u steel arch is that it is uniformly compressed after the backfill is compacted. When the surrounding rock pressure value on the u steel arch reaches a certain value, the support will be compressed and the pressure of surrounding rock acting on the u steel arch will decrease. Therefore, the surrounding rock pressure is larger than the bearing capacity of u steel arch and the arch is destroyed.

According to the specific site conditions, the flexibility to choose model, structure form and the tent of u steel arch distance, roadway construction of u steel arch set correct guidance, to ensure the effective and reliable to work, to speed up the drivage, reduce the amounts of the late repair, guarantee the safety in production, extend the length of service, achieve better technical and economic benefits, give full play to the bracket support performance has important significance.