Development and Application of Pre-stress Anchored Bolt Supporting Technology in Coal Mine

By introducing development procedure of anchored bolt supporting in China and analyzing action mechanism and influence factors of pre-stress anchored bolt,principle of anchored bolt supporting design was confirmed that there was no obvious separation and tension stress area in surrounding rock.Pre-stress value range of different anchored bolt was obtained and main factors influencing pre-stress were analyzed.Requirement of pre-stress anchored bolt and rope for supporting material was discussed.Mechanical properties of anchored bolt with high strength and high extension ratio,and pre-stress forcing method and instrument were introduced.Application of pre-stress anchored bolt and rope supporting in roadway with complex conditions including supporting model and effect was introduced.Pre-stress anchored bolt and rope,adding grouting for reinforcement if necessary,was an effective supporting manner for roadway with complex conditions.