ABSTRACT
The prevention and control of dynamic disasters in deep underground mines have become a topic urgent to be tackled. The 4D support technology is to build a space mesh bearing structure by connecting multiple anchor cables into a whole through locksets, in order to prevent and control the dynamic disasters of roadway in the 3D space with the time dimension. The force-transferring block set between the steel strand and the surface of coal-rock mass is the most crucial component of the technology, and it can convert the tensile force of steel strand into the annular and axial extruding forces and radial compressive force on the surface of surrounding rock. The action mechanism of the width and thickness of the force-transferring block on the roadway roof was analyzed through a numerical simulation model. The results from this study indicate: (1) the 4D anchor cables are connected into one system with the increase in the thickness of the force-transferring block; (2) the 4D anchor cables and the angle bolts are connected into one system with the increase in the width of the force-transferring block; and (3) the 4D support system improves the control of roof sag and the long-term stablility. The results provide the basis for the design of 4D support components and reveal the mechanism of rock mass stabilization with the 4D support.
