The Technology Research On Deep Hole Curtain Reinforcement For Pumped-Storage Power Station

Based on a curtain grouting engineering with slant straight hole of Guangdong province as the research background,mainly researched how to improve the quality of curtain grouting with ultra deep inclined straight hole.In view of this problem,studied from slant hole trajectory deviation and curtain grouting parameters,and then putted forward some relevant advice.In the study of inclined straight borehole trajectory deflection,mainly adopted the method of finite element analysis to simulate the interaction between the drill string and the background project dam foundation rock,discussed the influence of angle and axial drilling pressure for borehole trajectory deviation.At the same time,used analytic method to obtained the value of buckling critical and verifying the accuracy of the numerical simulation.Through the above analysis,aimed at the mechanism of borehole deviation,putted forward the deviation control technique of rigid packed hole assembly.The optimization of curtain grouting parameters for deep inclined straight hole,mainly used the method of discrete element program to simulated bedrock grouting process,studied the pressure diffusion regularity and grout diffusion in rock fracture.At the same time,combined with grout diffusion radius of experience formula and curtain grouting test compared to verify the accuracy of the numerical simulation,got the optimal grout diffusion radius.Through the above analysis,Successfully applied to the curtain grouting project by slant straight hole in Guangdong province,it has a certain practical guiding significance for the same future design and construction of curtain grouting anti-seepage engineering.