Abstract: To establish a simplified equivalent method accorded with the stability analysis of surrounding rock and support parameters evaluation in the bolt-shotcrete support, a mechanics model of composite materials for anchored rock mass is established in this paper, according to the basic principle of composite material mechanics. First, regarding the anchor and mortar as elastic body, the elastic parameters of equivalent anchor-mortar mechanical model are deduced. Then, regarding the rock and anchor-mortar complex as composite reinforced materials, the transverse isotropic body model is established, and the defined formula of corresponding parameters from the equivalent mechanical model are deduced. Moreover, based on the engineering example, numerical simulations are conducted to study the composite roadway model and conventional discrete roadway model. After the comparative analysis about the displacements in two sides, top and bottom of roadway and surrounding rock stress, the feasibility and applicability of the equivalent method is verified.

Key words: composite material mechanics；roadway stability；bolted rock mass；anchor-shotcrete support；numerical simulation