Abstract: The composite rock-bolt bearing structure, which is formed by bolts and surrounding rock duo to the interaction of bolt group with reasonable bolt length and density, can play a vital role in the roadway stability control. In this paper, based on self-developed test system of composite rock-bolt bearing structure, the effect law of bolt support density on bearing characteristics of the structure was studied, the actual strength and failure characteristics were measured, and the variation laws of inner stress of composite rock-bolt bearing structure and surrounding rock deformation were revealed. Moreover, the strength of composite rock-bolt bearing structure was further calculated, and the theoretical calculation results are close to the revised measured results.

Key words: composite rock-bolt bearing structure, bolt, surrounding rock, test system, strength