Unclassified 



OSSIFICATION 



20. Continued 



reduces the lateral pressures acting on the pile surface. Another test proved that the crushed 

 calcareous sand does not reduce the soil-pile interface friction angle. Several innovative pile 

 system concepts for improving the lateral load carrying capacity of piles in calcareous sand 

 were developed. 



Library Card 



I^JavarcivT'Engineering Laboratory 

 LABORATORY INVESTIGATION ON PILES IN 

 CALCAREOUS SEDIMENTS (Not Final), by 

 S.C. McCarel and R.M. Beard 



TN-1714 89 pp illus November 1984 Unclassified 

 1. Calcareous sand 2. Piling I. YF6O.536.091.O1.A1O6 



Laboratory tests were performed, using a model pile, to determine what effect pile driving has on 

 calcareous sand. Radiography was used to track the movement of lead shot in the sand during pile 

 driving. Driving energy was also recorded. A test was done to measure the amount of grain crushing 

 that occurs during pile driving. The result of this test shows that the side friction of piles in calcare- 

 ous sand is low and does not increase with increasing blows. The reason for the low friction compon 

 ent is due to crushing the weak calcareous grains, which reduces the lateral pressures acting on the 

 pile surface. Another test proved that the crushed calcareous sand does not reduce the soil-pile 

 interface friction angle. Several innovative pile system concepts for improving the lateral load 

 carrying capacity of piles in calcareous sand were developed. 



Unclassified 



