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The measurement of small soil displacements on a dutch hillslope |
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| Authors: | JD Nieuwenhuis and D Kleinendorst |
| Institution: | aDepartment of Civil Engineering, University of Technology, Delft The Netherlands bSubdepartment of Geodesy, University of Technology, Delft The Netherlands |
| Abstract: | A number of flat hollow cylinders equal in weight to the replaced soil have been installed at different depths below the surface of a 47% slope. The slope was developed over Maestrichtian chalk overlain by a poorly sorted but rather homogeneous Upper Pleistocene cover. The displacements of the cylinders have been recorded for three years. The design of the geodetical method of measurement and the results are discussed. The estimated error (twice the standard deviation) of the measurements regarding the horizontal component of the displacements appears to be less than 0.4 mm; the error regarding the vertical component less than 0.3 mm. Significant displacements have been recorded so far only from the upper 20 cm. The measured movements are spasmodic and parallel to the slope. The mean velocity of the top soil amounts to 1 mm/year. The collected data are insufficient to investigate the applicability of viscous creep models. |
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