Abstract: Bolting with resin full-length anchor and high prestress is an effective means to solve support problem of complex and difficult roadway, but its application and promotion have always been restricted due to the construction difficulties. This paper is committed to solving the difficult problem of coal mine roadway full-length anchoring through optimized anchor shape under the premise of the guarantee of anchor performance. The numerical simulation methods have been used to research the relationship between the bolt shape and anchorage bolt performance. Optimized bolt cross rib height is reduced from 1.46 mm to 1.20 mm; bolt cross rib spacing is increased from 11 mm to 30 mm; and the bolt cross rib width is increased from 3 mm to 10 mm. The optimized bolt shearing resistance is reduced by about 50% under the condition of not reducing in the anchorage performance. Consequently, mixing effect is ideal, achieving the goal of the optimization.

Key words: full-length anchor, bolt cross rib spacing, bolt cross rib height, bolt cross rib width, numerical simulation, optimization