The consolidation characteristics of an unsaturated compacted soil |
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| Authors: | C Kayadelen |
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| Institution: | (1) Department of Civil Engineering, Nigde University, 51100 Nigde, Turkey |
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| Abstract: | The compacted soils are extensively employed as mineral liners or a sealing system, constructed under municipal solid waste
and other containment hazardous materials to prevent or minimize the leakage of pollutant liquids and gases into ground water
and sublayers. This article presents a detailed experimental study on settlement characteristics, which are required for the
construction of a sealing system. For the experimental study where a compacted unsaturated soil taken from Adana in Turkey
has been used, a special equipped consolidation cell has been designed and constructed. The matric suction adopted as independent
stress-state variables has been controlled by using the axis translation technique. The consolidation tests have been performed
under constant matric suction. Furthermore, the pressure plate tests for various net vertical stresses have been conducted.
The test results have indicated that the settlement characteristics of a compacted soil as mineral liners and covers are highly
affected by matric suction. The water retention capacity of mineral liners, an important factor for hydraulic conductivity,
also changes with the vertical load. The compressibility decreases as the matric suction increases. It has been observed that
there exists an exponential relationship between the compressive indexes (C
t, D
t) and matric suction. |
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| Keywords: | Unsaturated soil Matric suction Consolidation Compacted specimen |
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