Part  C  -  Minimum  Requirements  on  geotechnical  investigations

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Part  C:  Minimum  Requirements  on  geotechnical  investigations  as  a
basis  for  planning  and  designing  offshore  structures
1  Regulations  and  codes  of  practice
1.1  General
The  construction  of  offshore  wind  energy  converters  involves  a  high  degree  of  difficulty,  their
foundations  are  classified  under  geotechnical  category  3  (earth  and  foundation  structures  and
geotechnical  measures  involving  a  high  geotechnical  risk;  difficult  design  and/or  difficult  soil
conditions,  and  unusual  loading  cases).  These  require  geotechnical  surveys,  investigations
and  assessments  by  a  geotechnical  expert  with  in-depth  knowledge  and  wide-ranging
experience  in  this  field  (see  Part  A,  section  4).
Minimum  requirements  of  geotechnical  field  and  laboratory  investigations  as  part  of  fundamental ­
  design  are  specified  in  Part  C,  sections  2  and  3.  In  addition,  necessary  investigations
arise  due  to  specific  requirements  of  the  respective  foundation  structures  and  soil  situation,
particularly  with  innovative  solutions.
1.2  Standards
The  geotechnical  expert  must  apply  the  following  standards  with  corrections  and  normative
references:
DIN  EN  1997-2:  Eurocode  7:  Geotechnical  design  -  Part  2:  Ground  investigation  and  testing
DIN  EN  1997-2/NA:  National  Annex  -  Nationally  determined  parameters  -  Eurocode  7:  Geotechnical ­
  design  -  Part  2:  Ground  investigation  and  testing
DIN  4020:  Geotechnical  investigations  for  civil  engineering  purposes  -  supplementary  guidelines ­
  to  DIN  EN  1997-2
It  must  be  considered  that  these  standards  are  used  in  conjunction  with  the  following  codes:
DIN  EN  1997-1:  Eurocode  7:  Geotechnical  design  -  Part  1:  General  rules
DIN  EN  1997-1/NA:  National  Annex  -  Nationally  determined  parameters  -  Eurocode  7:  Geotechnical ­
  design  -  Part  1:  General  rules
DIN  1054:  Soil  -  verification  of  safety  in  earthwork  and  foundation  work  -  supplementary
guidelines  to  DIN  EN  1997-1
In  addition,  relevant  DIN  norms  also  apply  for  planning,  execution,  documentation  and
assessment  of  field  and  laboratory  investigations  and  these  are  supplemented  by  the  stipulations ­
  of  this  guideline.
The  most  recent  version  of  standards  published  as  a  white  paper  applies  in  all  cases.
The  Federal  Maritime  and  Hydrographic  Agency  reserves  the  right  to  remove  individual  standards ­
  from  having  to  be  applied.