1. Technical Expert, Onshore Foundation division, Norwegian Geotechnical Institute, P.O. Box 3930 Ullevål Stadion, Oslo 0806, Norway.
2. Project Engineer, Onshore Foundation division, Norwegian Geotechnical Institute, P.O. Box 3930 Ullevål Stadion, Oslo 0806, Norway (corresponding author).
3. Technical Expert, Instrumentation division, Norwegian Geotechnical Institute, P.O. Box 3930 Ullevål Stadion, Oslo 0806, Norway.
4. Expert Advisor, Geotechnical division, Norconsult AS, P.O. Box 626, Sandvika 1303, Norway.
5. Senior Engineer, Geotechnical division, Norconsult AS, P.O. Box 626, Sandvika 1303, Norway.