Title: Measurement depth of vibratory roller-measured soil stiffness
Abstract: This paper presents the results of an experimental and analytical study conducted to assess the measurement depth and volume of vibratory roller-measured soil stiffness. Test beds were constructed in lifts with controlled thickness and instrumented with stress and strain sensors. A composite assessment of roller-measured stiffness on individual lifts throughout construction revealed that measurement depths ranged from 0·9 to 1·2 m using two common-sized vibratory rollers. For overlying material layer thickness greater than the measurement depth, roller-measured stiffness was found to be a function of the overlying material only. Otherwise, roller stiffness was a function of the two materials. Measurement depth was not significantly influenced by the layer material stiffness ratio. The sensitivity of roller-measured stiffness to thin lifts of material (e.g. 0·2 m) was found to depend on the stiffness ratio of the two materials. Data from in-ground instrumentation supported by elastic theory revealed that, at the experimentally observed measurement depths, both the total and cyclic stress and strain were approximately 10% of their maximum values. An analysis of cyclic strain profiles from three different soils revealed that the measurement depth is weakly dependent on excitation force amplitude. For the two rollers used, measurement depth ranged from 0·8 m under low excitation force to 1·2 m under high excitation force.
Publication Year: 2009
Publication Date: 2009-09-01
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 30
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