Part  B  -  Verifications  and  approval  requirements

59

To  the  extent  that  subsoil  deformations  are  relevant  in  terms  of  the  design  but  cannot  be  predicted ­
  with  the  necessary  level  of  accuracy,  the  resulting  problems  shall  be  bypassed  using
suitable  design  measures  if  circumstances  permit.  Otherwise,  the  observation  method  in  accordance ­
  with  DIN  EN  1997  (EC  7)  shall  be  applied  (Appendix  3-IV).
Where  cyclic  loads  are  applied  to  an  offshore  structure,  one  can  expect  the  load-bearing  behaviour ­
  of  the  foundation  to  differ  considerably  from  that  of  static  and  variable  loads.  Currently, ­
  there  are  no  generally  accepted  or  suitably  validated  calculation  models  for  designing
foundation  elements  which  are  subject  to  cyclic  loads.  Accordingly,  the  codes  of  practice  set
down  in  this  standard  do  not  currently  contain  any  standard  regulations  in  this  respect.  With
respect  to  the  application  of  the  codes  of  practice  set  down  in  this  standard  to  offshore  wind
turbines  in  the  EEZ,  the  scope  for  action  with  regard  to  planning  and  testing  within  the  current
application  process  is  specified  in  the  application  notes  contained  in  the  Appendices  3-I.2,
3-I.3,  3-I.4  and  3-II.

3.2  Development  phase
3.2.1  Technical  codes  of  practice
The  technical  codes  of  practice  to  be  applied  are  detailed  in  section  B3.3.1.

3.2.2  Requirements  and  required  verifications
The  requirements  pertaining  to  the  geotechnical  documents  and  required  verifications  during
the  development  phase  are  regulated  in  the  Standard  Ground  Investigations.

3.2.3  Documents  to  be  submitted  for  the  1 st  release
The  documents  required  to  obtain  the  1 st  release  shall  be  supplemented  by  the  following  verified ­
  geotechnical  documents  in  accordance  with  the  BSH  Standard  Ground  Investigations:
[Doc.  No.  310]  Geological  report,
[Doc.  No.  311]  Preliminary  ground  investigation  report
[Doc.  No.  312]  Subsoil  and  foundations  survey  (development  phase)
[Doc.  No.  313]  Verification  report  pertaining  to  Docs.  No.  310,  311  and  312.

3.3  Design  phase
3.3.1  Technical  codes  of  practice
3.3.1.1  Hierarchy  of  codes
The  foundation  elements  shall  be  designed  in  accordance  with  Eurocode  7;  in  addition,  the
DIN  standards  in  their  respective  latest  white  copy  versions  shall  also  apply.  The  BSH  reserves
the  right  to  exclude  individual  standards  or  parts  thereof  from  the  obligation  to  apply  the
above  standards.
In  addition,  the  following  provisions  of  this  standard  shall  apply:
Appendix  3-I  Consideration  of  cyclic  loads  in  the  design  of  foundation  elements
Appendix  3-II  Verification  of  the  limit  states  for  foundation  elements  taking  into  account ­
  cyclic  loading
Dynamic  pile  load  tests

Appendix  3-ill