Control of Strength Parameters of Steel-Polymer Rock Anchors

Abstract

Facts have proved that it is of important significance to study repair and reinforcement technology for damaged soft-rock roadway in deep mine. With field survey and borehole TV detection of large soft-rock roadway in south wing of Yangcheng Coal Mine, failure characteristics of surrounding rocks in the roadway were discussed. Based on the principle of bolt-grouting support, the repair and reinforcement plan of full-face high-strength pre-stressed bolt support to reinforce surrounding rocks actively + full face grouting lines and long grouting reinforcement with anchor cable + floor overbreak and bolting-backfill for floor heaving control was proposed. Moreover, reasonable support parameters and process were designed. Numerical simulation and field application test confirmed that the proposed plan can control deformation failure of surrounding rock effectively and safeguards the long-term roadway stability. The proposed plan can be popularized to similar roadway repairs.