| Mode | Condition | Objective | |------|-----------|------------| | Force control | Soft to medium stiff clay (N < 15) | Maintain constant jacking force, record penetration rate (mm/min). | | Rate control | Dense sand / Old Alluvium (N > 30) | Limit penetration rate to < 5 mm/sec to avoid excessive load spikes. | | Stroke control | Final set-up (refusal) | Advance in 50 mm strokes; record final jacking pressure at each stroke. |
: All stacking must be completed before the test begins; adding blocks during the loading cycle is prohibited to prevent sudden ground pressure peaks or toppling. Ground Check 15) | Maintain constant jacking force
Unlike driven piles, jacked piles require a controlled, steady penetration rate. jacked piles require a controlled