Earth Dam Reinforcement Cutoff Wall Quality Detection Method Research

In recent years,among the project of earth-rock dam reinforcement,the impervious wall as earth-rock dam seepage(or leakage)treatment effective method has been widely used.As the impervious wall force conditions are complex and also concealed,various defects existing in the construction and operation of the wall prone.In view of the importance of impervious wall in the whole anti-seepage system of earth-rock dam,it is critical vital to study the method of seepage-proof wall and synthetically determine the whole quality of impervious wall,and also for studying the seepage characteristics of impervious wall.In this paper,we mainly study the cut-off wall drilling method and many kinds of nondestructive detection methods in the earth-rock dam reinforcement project.The main research works are as follows:(1)By improving the traditional core drilling method used in the drilling pipe,circulating fluid,we can improve the detection rate of the cut-off wall core in theory;by increasing the drilling rig to ensure the vertical drilling,thus ensuring It can be used to inspect the rock in the bottom of the impervious wall.Applying the method of modified core drilling in the high-pressure jet grouting wall,and achieved good results.And summarizes the key technologies in equipment,materials,methods and processes.After the sampling of the cut-off core,the cross-hole ultrasonic testing is carried out.The technology is intuitively,effectively and accurately reflect the quality of the cut-off wall.(2)The key techniques of high-density seismic imaging,Rayleigh wave,high-density resistivity,and ground penetrating radar are studied and the applicability and limitations of various methods are analyzed.The characteristics and purpose of the cutoff wall,the one or more(comprehensive)feasible detection methods are studied,and the comprehensive detection method suitable for the comprehensive inspection of the cutoff wall is discussed.