高地应力区域长环形支架耦合加固技术研究

Research and Application of Long Support Ring Coupling Reinforcement Technology in High Ground Stress

陶二矿首采区新南总回风下山巷道距离2号煤底板为7～15 m,地质条件复杂多变,地应力高,深井软岩巷道载荷大于围岩强度,致巷道围岩塑性区和破碎区范围增大,支承应力和围岩变形量急剧增加。通过对围岩变形破坏分析,提出可行的支护理论,并鉴于长环形支架及注浆加固支护技术特点,采取锚网索+长环形支架(U钢)+全断面注浆二次支护形式耦合加固技术,使支护体结构与围岩耦合成一体,提高围岩的骨架承载能力,变被动支护为主动支护,达到控制巷道变形的目的。

Tao＇er new south first mining area wind tunnel ranged No. 2 coal floor about 7 ～ 15 m,with complex geological conditions,high stress,deep soft rock roadway surrounding rock strength was greater than the load,causing the plastic zone roadway and broken zone increases,supporting stress and rock deformation increased dramatically,through the surrounding rock deformation and failure analysis,feasible supporting theory was put forward. The length of the annular support and grouting support technology characteristics and adopting cable Anchor ＋ long ring bracket（U steel） ＋ full face grouting reinforcement coupled secondary support form technology,supporting structure and surrounding coupled into one improved the skeleton rock bearing capacity,changed from passive support to active support to achieve roadway deformation control purpose.