1. High-Pressure Injection Grouting : Clarifying the Concept High-Pressure Injection Grouting Method: CCP – Small-Diameter High-Pressure Injection Pile (with Cement Slurry or Small Amount of Additives) Commonly used for: Assisting in water sealing of retaining structures (double-row design on the water-facing side/sand or interlayer formation considerations for effectiveness and verticality/counteracting soil pressures on retaining structures)