Rapid load field tests interpreted with the new Guideline

Author(s):	Hölscher, Brassinga, van Tol, Middendorp, Revoort
Year:	2009
Language:	English
Where:	17th International Conference on Soil Mechanics & Geotechnical Engineering, Alexandria, Egypt

CONCLUSIONS:

Two instrumented driven piles are tested by both SLT and RLT. The measurements lead to the following conclusions:

• SLTs show a bearing capacity of 1120 kN respectively 1150 kN. The RLT’s show a derived bearing capacity of > 1137 kN respectively 1158 kN.
• The stiffness measured by RLT is practically useful.
• Resistance distribution between shaft and toe in an RLT differs from an SLT, presumably due to rate effects in the soft soil.
• Excess pore water pressures are measured close to the pile toe.
• The UPM method in the draft guideline gives information on stiffness and bearing capacity, for the derivation of the full derived load-displacement diagram additional development is required.
• The variable damping method must be developed further.

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