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The thesis describes an investigation, at laboratory scale, into the feasibility of using and effectiveness of sand columns as a means of ground improvement in a highly compressible soft soil. Consolidation tests on natural soil specimens without a sand column were carried out on 20mm, 40mm and 60mm...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/13687 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The thesis describes an investigation, at laboratory scale, into the feasibility of using and effectiveness of sand columns as a means of ground improvement in a highly compressible soft soil. Consolidation tests on natural soil specimens without a sand column were carried out on 20mm, 40mm and 60mm high specimens, to examine the possible influence of sample height on the consolidation characteristics and behaviour of Bandung clay in its natural state. Consolidation tests were performed on models 60mm high having a sand column installed at the centre of each specimen at selected column densities (maximum, medium, minimum) and for various column diameters (10mm, 15mm, 20mm, 25mm). The diameter of each specimen, the sequence and the magnitude of load applied to each test specimen were as in the standard procedure for consolidation testing. With regard to the thickness of the natural soil specimens, it was found that, within the range of experimental accuracy and allowance for sample variation and sampling disturbance, similar values of vertical strain were obtained for all three specimen thicknesses tested. Specimens containing a sand column installed in the centre generally showed a reduction in settlement resulting from the inclusion of the sand column at any load applied for the normal 24-hour loading period. However, possibly because of the very soft nature of the soil and variability in moisture and organic content, there was no definite pattern in settlement reduction as a function of column density or diameter. The inclusion of the centre sand columns clearly showed that the radial drainage, expressed in terms of Cvr, was significantly, greater than the corresponding vertical condition, expressed in term of Cv, for applied effective stress values less than the maximum past pressure. Both vertical and radial values decreased considerably for effective stresses past the maximum past pressure although the radial value was still greater than the corresponding vertical value. |
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