2231 Ground preconsolidation (0) Placing excavated material, ballast or other material upon the ground surface as preloading, to achieve consolidation 2232 Mechanical ground stabilization (0) Stabilizing and/or improving the bearing capacity and slip resistance of existing ground by means of geotextile stabilization, dynamic compaction, vibroplacement, power vibration, sand stowing and other mechanical methods 2233 Chemical ground stabilization (1) Stabilizing and/or improving the bearing capacity and slip resistance of existing ground by cementitious admixtures, injections and electro-chemical methods