A process and system for ground consolidation and increasing the load capacity of piles wherein the lower end of a bore hole is enlarged upon injection of a high pressure liquid, the pressure of which is periodically varied at a high frequency to cause compression and consolidation of the surrounding ground area and the widening of the lower end of the bore hole. Reinforcing anchorage structure is mounted within the bore hole and embedded within hardened concrete or like material, and a stressing steel rod is fixed to the anchorage and extends upwardly through the bore hole for connection to suitable building support structure mounted at ground level.