低压固结灌浆协同锚索控制尾水隧洞软岩大变形机制OA

In response to the problem of large deformation of soft rock in the tailwater tunnel of a hydropower station,this paper systematically studies the mechanism of the collaborative control technology of low-pressure consolidation grouting and prestressed anchor cables.By analyzing the deformation characteristics of soft rock,the implementation effect of reinforcement schemes,and safety monitoring data,the synergistic principle of low-pressure consolidation grouting improving the mechanical properties of surrounding rock and prestressed anchor cable restraining surrounding rock deformation was revealed,which can increase the wave velocity of surrounding rock by more than 11%and effectively enhance the integrity of rock mass.The prestressed anchor cable controls the deformation rate of the surrounding rock within 0.5mm/d by applying active support force.The synergistic effect of the two forms an integrated support system of"reinforcement restraint",significantly improving the stability of soft rock tunnels.