Full Anchor Support Technology of Mine Roadway with Soft Roof in Stress Abnormal Zone

In order to analyze the problems existed in the application of the mine anchor, based on a high pre-stressed power support theory, a high pre-stressed s hort anchor support technology was applied to the full cross section of the mine roadway with soft roof and serious mine pressure behaviors in abnormal zone.In compa rison with the numerical simulation, the pre-stress and function effect of the anchor support obtained was better than the conventional bolt and the anchor support and t he stressed status of the pilot surrounding rock in the mine roadway heading face could be improved.A full anchor support trial was conducted in No.W4203 Mine Trans portation Roadway of Luxin No.2 Mine.The roof subsidence value of the mine roadway was reduced over 90% than the previous support in comparison. The deformation of the mine roadway was controlled.The sidewall over blasted, deformation and other technical problems were effectively solved in the mine roadway heading process.T he space and row spacing between the anchors were increased to 1 200 mmx1 400 mm and the heading efficient rate of the mine roadway was highly improved.