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Appendices 
• It shall be demonstrated that the structural behaviour shall stay within the limits to be main 
tained, with an adequate degree of probability. 
• The stability and serviceability limits to be complied with shall be accordingly differentia 
ted. 
• A measuring programme shall be prepared using significant parameters to check whether 
the actual structural behaviour is within the limits that are to be maintained. 
• The critical values and intervention levels of the parameters acting as indicators of the limits 
to be complied with shall be accordingly determined. 
• A plan of suitable countermeasures shall be developed for every possible eventuality in 
which measurements indicate that limits to be maintained have been exceeded. This plan 
forms part of the stability verification documentation. It shall be possible to execute the pl 
anned countermeasures at any time. 
• The measuring intervals and results shall be capable of indicating the need for countermea 
sures at a sufficiently early stage for the countermeasures to be taken in good time. 
• During construction work and operation, the measurement programme and its timely eva 
luation shall be carried out as scheduled and shall be documented. Deviations from this 
plan shall be documented. 
Simply monitoring the structure without a detailed definition of the limits or counter measures 
is not suitable for the verification process. 
Appendix 3-V Application of numerical models for geotechnical verifications 
Preparing stability verifications using numerical methods in geotechnology is not generally the 
recognised state of the art in Germany. However, this is generally permissible according to 
DIN 1054. Basic modules for standardised approaches have been worked out in the form of 
recommendations by the AK 1.6 Numerics in Geotechnics study group at the German Geo 
technical Society (DGGT). 
Soil-mechanical model computations generally contain uncertainties. Although numerical mo 
dels using the finite element method make it possible to use the continuum mechanical calcu 
lation models on complex structures even when taking account of the ground, these are ext 
remely simplified and require critical assessment by the geotechnical planning expert. 
Special ground properties, interactive processes and complex procedures can be studied in 
principle and qualitatively using numerical models, however quantitative studies cannot ne 
cessarily be reproduced or represented reliably. System changes due to cyclical processes 
cannot generally be represented with sufficient reliability. 
Plausibility checks represent a significant element in assessing numerical calculation results, 
e. g. by comparing them with areas of experience. Where adequate experience with foundations 
for comparable offshore structures is not available, particular value shall be placed on formula 
ting simple analytical models and on making a critical and cautious evaluation of the results 
when designing the foundation elements and assessing their interaction with the support struc 
ture. This includes a sensitivity analysis with respect to the decisive model parameters.