Drilling and Grouting 



- Used when predicted driving resistance exceeds hammer capacity 



- Typically used in hard coral, rock 



- Recommended for use in calcareous sands and soft silt where 

 developed frictional capacities are low. 



Pile Installation Methods 



(Sj Drif/ifia and ofcu/'fia 



/% /'isfo/ZaVo/i />ra^ec/s. 



- Grouted piles can be 

 underreamed to greatly 

 increase vertical 

 capacity. 



- Underreams of more than 

 5m dia have been con- 

 structed @ AOm depth in 

 the North Sea. 



D. Pile Capacity 



1. Lateral and uplift 

 force at the anchor 



- Forces on buried 

 pile are altered 

 in magnitude and 

 direction. 



a. Simplified 

 Analysis 



- Assumes no 

 friction 

 along buried 

 chain 



i 



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V'' t-J 



V,^ 







(a) Z?tf/4'/"7 </ T^-s 



/>•'/'£ afC^er 



35 



