| Parameter | Good Practice Limit | GEOSS Trigger (Action Required) | |-----------|--------------------|----------------------------------| | Jacking rate | 0.5 – 1.5 m/min | >2 m/min (reduce rate, check hydraulic oil temp) | | Max jacking force | ≤ 80% of pile structural capacity | >85% – stop jacking, assess toe damage | | Heave of adjacent ground | < 10 mm | 10–25 mm – reduce jacking rate; >25 mm – stop, grout relief holes | | Pile verticality | < 0.5% deviation | >1% – de-jack, re-align; >2% – abandon pile | | Hydraulic pressure spike | < 15% of steady pressure | >15% – inspect pile head & shoe |
When installing a large group of piles, the recommended sequence is to jack from the inside out. This approach minimizes the potential for soil heave and reduces lateral pressure buildup on the outer piles. | Parameter | Good Practice Limit | GEOSS
In certain cases, a systematic, directional sequence (e.g., left to right) is adopted to ensure uniform soil displacement across the site. 4. Termination Criteria 4. Termination Criteria