Hello! Stop forcing it immediately - that's actually one of the mistakes to avoid. Applying excessive pressure when you hit rock can bend the pile, damage your equipment, or cause the pile to tilt off-vertical. The proper approach is to relocate the pile slightly to avoid the obstruction. Sometimes moving just 15-20 centimeters is enough to miss the rock. Check out
https://tips-for-working-with-piles.blo ... screw.html where they specifically address this situation. If you're consistently hitting rock across your whole site, you might need specialized equipment or a different foundation approach. Better to take the time to relocate than to damage your pile or create an unstable installation by forcing it.