Abstract
Quality control of compacted soil is required in order to obtain a homogeneous earth fill. Due to the use of different borrow areas or changes in the soil properties at the same site difficulties may exist in controlling the earth fill by the use of the traditional optimum water content and density. In this case the use of a soil parameter that could reflect directly the mechanical behaviour of the soil may be more reliable. The vane test is a useful tool for measuring undrained shear of soft clays in the field. The use of the mini-vane test in laboratory also provides useful information, in particular for remolded soils, although the use of vane test for compacted soil is not common it may be a useful tool for compaction control in the field. The determination of the relation between Undrained Shear strength (Su) and the Liquidity Index (IL) has been shown to present a consistent relation even for IL lower than zero. The soil below the plastic limit or close to the optimum water content in the case of compacted material presents a negative pore-water pressure (suction). The measurement of the suction is fundamental for the understanding of the phenomena involved with the change in strength after compaction or due to seasonal variation. The mini-vane test can be a useful tool to understand the Su versus IL relation for unsaturated soils. In addition suction measurement is performed during the test using a high capacity tensiometer, possibly for the first time. The tests were performed with a compacted residual soil of gneiss. The objective of the study is to initiate the evaluation of the use of vane test for compaction control in the field, investigating the behaviour of the soil in terms of undrained shear strength and its relation to liquidity index and suction.
Published Version
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