Effect of rod friction on vane shear tests in very soft organic harbour mud |
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| Authors: | Benjamin F Schlue Tobias Mörz Stefan Kreiter |
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| Institution: | (1) DFG Research Center Ocean Margins (RCOM), University of Bremen, Bremen, Germany |
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| Abstract: | Very soft organic harbour mud is increasingly used as a filling and construction material in harbour construction and reorganization.
The undrained shear strength of such soft sediments is the critical geotechnical soil parameter with regard to any specific
construction design. Field and laboratory vane shear testing is a standard method to quickly determine this important parameter.
So far, the effect of rod friction on vane shear tests in very soft organic soils is unclear. In this study we present results
from laboratory experiments on harbour mud from a construction site in northern Germany. Relations among vane and rod geometry,
penetration depth, water content, rod friction and undrained shear strength are derived. Based on these relations the influence
of rod friction on vane shear test results is investigated. The results indicate that field and laboratory vane shear test
measurements may be significantly influenced by rod friction. Methods are proposed to correct for the rod influence, which
is shown to increase with rising water contents. |
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| Keywords: | Rod friction Soft organic soils Undrained shear strength Vane shear test |
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