Study on the coupling system of high prestress cable truss and surrounding rock on a coal roadway

摘要

The combined support technology of prestressed bolt and cable truss has been widely used in coal mines, but the mechanical interaction between cable truss and surrounding rock hasn’t been studied systematically. In this paper, the development process of truss support system is briefly discussed, which is from bolt truss to cable truss, then to high prestress cable truss. The support structure and advantages of cable truss are analyzed thoroughly. Based on the coupling relationship between the high prestress cable truss and the roof rock, the mechanical model of cable truss is built, and the calculation formulas of anchoring force and pre-tightening force are drawn out. The numerical simulation and field observation results of Xinsan mine in Fengfeng Coal Group showed that the design scheme of combined support system including high prestress cable truss was reasonable and effective.