Question

In piling technology, explain the difference between a “displacement pile” and a “non-displacement pile”.(4marks) (b)Using graph paper, sketch 3 curves illustrating typical trends of variation of  pile  head  resistance,  shaft  resistance  and  base  resistance  with increasing settlement, as expected from load testing a CFA pile in clay. Explain the differences between the three curves.(6 marks)(c)A  bored  cast  in-situ  pile  of  0.6  m  diameter  by  10  m  long  is  installed through  a  6  m  thick  layer  of  stiff  clay  overlying  a  dense sand  layer  as shown in Figure Q5. The sand layer extends to great depth. If the water table is located at ground level, calculate the ultimate bearing capacity of the pile using the charts in the Geotechnics Formula Booklet provided with this exampaper (Weltman and Healy, 1976 andBerezantzev et. al. 1961). Take  the  lateral  earth  pressure  coefficient  Ks  =  0.7  for  the  sand-pile interface layer.     In piling technology, explain the difference between a “displacement pile” and a “non-displacement pile”.(4marks) (b)Using graph paper, sketch 3 curves illustrating typical trends of variation of  pile  head  resistance,  shaft  resistance  and  base  resistance  with increasing settlement, as expected from load testing a CFA pile in clay. Explain the differences between the three curves.(6 marks)(c)A  bored  cast  in-situ  pile  of  0.6  m  diameter  by  10  m  long  is  installed through  a  6  m  thick  layer  of  stiff  clay  overlying  a  dense sand  layer  as shown in Figure Q5. The sand layer extends to great depth. If the water table is located at ground level, calculate the ultimate bearing capacity of the pile using the charts in the Geotechnics Formula Booklet provided with this exampaper (Weltman and Healy, 1976 andBerezantzev et. al. 1961). Take  the  lateral  earth  pressure  coefficient  Ks  =  0.7  for  the  sand-pile interface layer.     piling technology, explain the difference between a “displacement pile” and a “non-displacement pile”.(4marks) (b)Using graph paper, sketch 3 curves illustrating typical trends of variation of  pile  head  resistance,  shaft  resistance  and  base  resistance  with increasing settlement, as expected from load testing a CFA pile in clay. Explain the differences between the three curves.(6 marks)(c)A  bored  cast  in-situ  pile  of  0.6  m  diameter  by  10  m  long  is  installed through  a  6  m  thick  layer  of  stiff  clay  overlying  a  dense sand  layer  as shown in Figure Q5. The sand layer extends to great depth. If the water table is located at ground level, calculate the ultimate bearing capacity of the pile using the charts in the Geotechnics Formula Booklet provided with this exampaper (Weltman and Healy, 1976 andBerezantzev et. al. 1961). Take  the  lateral  earth  pressure  coefficient  Ks  =  0.7  for  the  sand-pile interface layer.     In piling technology, explain the difference between a “displacement pile” and a “non-displacement pile”.(4marks) (b)Using graph paper, sketch 3 curves illustrating typical trends of variation of  pile  head  resistance,  shaft  resistance  and  base  resistance  with increasing settlement, as expected from load testing a CFA pile in clay. Explain the differences between the three curves.(6 marks)(c)A  bored  cast  in-situ  pile  of  0.6  m  diameter  by  10  m  long  is  installed through  a  6  m  thick  layer  of  stiff  clay  overlying  a  dense sand  layer  as shown in Figure Q5. The sand layer extends to great depth. If the water table is located at ground level, calculate the ultimate bearing capacity of the pile using the charts in the Geotechnics Formula Booklet provided with this exampaper (Weltman and Healy, 1976 andBerezantzev et. al. 1961). Take  the  lateral  earth  pressure  coefficient  Ks  =  0.7  for  the  sand-pile interface layer.