Study on High Strength Yield Bolt Support System Test in Mine High Stress Soft Rock Roadway

In order to solve the large surrounding rock deformation occurred during the heading process of the south wing dip roadway in second Level of Yunjialing Mine and it was difficult to control the stability of the mine roadway after repaired, a high strength and high pre-tension yield bolt system was applied to the support trial in the south wing transportation dip roadway at the second level.The Q600 high strength yield bolt and a diameter 18.9 mm bird-nest yield anchor with designed pre-ten sion of 80 and 150 kN individually were selected for the trial roadway.The monitoring and measuring results showed that the max roof convergence of the trial roadway was 46 mm, the max relative convergence of the two sidewalls was 182 mm and there was no floor heave basically.With the installation of the high strength, high pre-st ress yield bolt, the high strength support system could meet the support requirements of the high stress soft rock rioadway and could realize a once successful support of the high stress soft rock transportation dip roadway.