Retrofitting of foundation for controlling the settlement of infrastructure by micro pile: a case study

    Abstract:  Micropiles are mainly used to increase the bearing capacity and reduce the settlements particularly  for strengthening  the  existing  foundations.  Frictional  resistance  between  the  surface  of  the  pile  and  its surrounding  soil  and  the  associated  group/network  effects  of  micropiles  are  considered  as  the  possible mechanisms  for  improvement.  This  paper  is  mainly  devoted  to  investigation  a  case  study  in  which foundation  of  a  drilling  rig  was  retrofitted  by  constructing  a  thick  concrete  ring  confining  the  existing foundation which was supported by micropiles. The modelling was conducted by GEO 5 software in two phases including and excluding micropiles, respectively. Both phases were done regarding the existence of  cracks  around  the  foundation.  The  obtained  results  show  that  this  method  enhanced  the  bearing capacity  and  flexural  stiffness  of  foundation.  Also,  this  study  provides  valuable  information  about  the design and application of micropiles.

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