Part C - Minimum Requirements on geotechnical investigations 
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4.4 Supplementary report on soil behaviour under cyclic loading 
4.4.1 General 
With regard to the verification for foundation structures, the potential influence of cyclic 
loading on soil behaviour must be drawn up such as degradation, an accumulation of defor 
mations and an accumulation of excess pore water pressure potentially as far as liquefaction 
(see also Standard Design). 
4.4.2 Supplementary report on soil behaviour under cyclic loading 
As part of the second release, the design engineer must describe the building ground behav 
iour under cyclical load whilst taking into consideration the design work from the geotechnical 
planner and plan a suitable study programme together with the geotechnical expert. Execu 
tion of the study programme is accompanied by the geotechnical expert and the results are 
assessed by him regarding the foundation system which has been selected. Close co-opera 
tion between the geotechnical planner and the geotechnical expert is required in this case. It 
is also possible that the planner's tasks are carried out by the geotechnical expert, who is 
then active on the design side. 
The findings are then compiled in a supplementary report regarding cyclical loads which sup 
plements the geotechnical design report with the parameters relevant to cyclical measure 
ments. 
5 Monitoring during construction (execution phase) 
Geotechnical elements within construction shall be monitored and inspected in accordance 
with typical rules, findings are documented and assessed in reports of findings by the geo 
technical engineer. 
6 Monitoring during operation 
If particular elements of the structural stability and serviceability verifications are not based on 
previously performed computations or testing of component parts or experience in general or 
in a particular case, proof of which can be provided, suitable monitoring instruments shall be 
provided and put into operation (observational method according to DIN EN 1997-1). 
Remarks: The instrument monitoring concept in such cases is part of the structural stability 
documentation and constitutes a mandatory element of inspection during the operation 
phase. The type and scope of the investigations and length of the intervals as well as toler 
ances are determined by the geotechnical expert in co-ordination with the developer and the 
design engineer, taking into account the tasks to be performed and the requirements. Meas 
urement results must be assessed on a periodic basis by the geotechnical planner to see if 
the facility behaves in accordance with the design. The geotechnical expert then adopts a po 
sition regarding the findings and assessments. The measurement results and their evaluation 
by the geotechnical expert have to be submitted periodically to the approval authority as 
agreed. Further issues are covered by Standard Design.