Geoss Good Practice For Installation Of Jacked Foundation Piles In Singapore Link [Original]

| Parameter | GEOSS (Singapore) | BS 8004 (UK) | Eurocode 7 | |-----------|-------------------|--------------|-------------| | Max jacking force | 80% of pile structural capacity | 75% (driven piles) | 85% (static load) | | Heave limit | 15 mm at 1 m distance | 25 mm at 2 m | Not explicitly defined | | Verticality tolerance | 1:200 | 1:75 | 1:100 | | Restrike period (clay) | 3 to 7 days after initial jacking | 1 to 5 days | 2 to 10 days | | Pre-boring permission | Required if SPT > 50 or clay N > 20 | Optional | By specification |

If the pile reaches the required jacking load (termination criterion) but is significantly shorter than the design depth, the designer must evaluate whether the pile can be terminated early or if additional measures are required. 5. Eurocode 7 Compliance | Parameter | GEOSS (Singapore) | BS 8004

The draft guideline for the installation of jacked piles includes several "good practices" to ensure quality and compliance with Eurocode 7 . Key Good Practices for Jacked Pile Installation Key Good Practices for Jacked Pile Installation :

: It recommends using machines at roughly 75% of their maximum capacity to ensure stability and safety. 2. Operational Advantages 50 or clay N &gt

| Problem | Root Cause | Good Practice Mitigation | |---|---|---| | | Excessive jacking force in hard stratum | Monitor jacking force; use reinforced tip shoes | | Lateral soil movement | Soil heave from displacement | Sequence installation from centre outward; use control piles | | Neighbouring structure distress | Ground movement from piling | Install instrumentation; adopt “Managing Adverse Impact” framework (GEOSS Seminar 2015) | | Unexpected obstructions | Inadequate site investigation | Conduct probe holes; use Gyro Piler rotary cutting capability | | Installation records lacking | Poor documentation | Implement digital logging system; maintain soil description logs |

While the design aims for a certain depth, the ultimate termination criterion is the achievement of the required geotechnical resistance.