Abstract: To enhance the strength, stiffness, and anti-deformation ability of anchored mass in surrounding rock, a design concept of “hard preload, high strength, high stiffness, high anchored stress and low density” is introduced based on the anchorage mechanism of anchors. In the on-site experiment, high strength anchor bolts and the components are used as the anchorage materials, and linkage components are adopted for the sake of crosswise and longitudinal linkages of the anchor bolt group. Then, active anchorage effects are achieved by raising anchored stress and hard preload of the anchor bolt group. In this way, the anchor bolts and anchored mass constitute a bearing structure, which can decrease the deformation and damage of the surrounding rocks, and improve the safety situation of roadway. The experiment results show that this design concept and its application can well solve such problems as breaking joint development, uneven deformation of roadway roof and low speed excavation. Marked by its validity, applicability and potential economic interests, this design concept is worth applying and promoting.

Key words: pre-stressed anchors, linkage components, anchored mass, strength, stiffness