Degree of Saturation and Liquefaction Resistances of Sand Improved with Sand Compaction Pile
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 132, Issue 2
Abstract
Sand compaction pile (SCP) is a ground improvement technique extensively used to ameliorate liquefaction resistance of loose sand deposits. This paper discusses results of laboratory tests on high-quality undisturbed samples obtained by the in situ freezing method at six sites where foundation soils had been improved with SCP. Inspection of samples revealed that the improved ground was desaturated during the ground improvement. Degree of saturation was lower than 77% for the sand piles and 91% for the improved sand layers, while was approximately 100% for improved clayey and silty soils. A good correlation was found between and 5% diameter of the soil; the larger 5% diameter of soils , the lower the degree of saturation. It appeared that the variation of with for soils within a month after the ground improvement work was quite similar in trend to that after more than several years. Degree of saturation of soils after several years was noticeably, but not significantly, higher as compared with that shortly after ground improvement, indicating longevity of air bubbles injected in the improved soil. Undrained cyclic shear tests were also carried out on saturated and unsaturated specimens and effects of desaturation on undrained cyclic shear strength were studied. The test results were summarized in a form of liquefaction resistance with reference to normalized standard penetration test -value.
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Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 132 • Issue 2 • February 2006
Pages: 258 - 264
Copyright
© 2006 ASCE.
History
Received: Sep 21, 2004
Accepted: Jun 29, 2005
Published online: Feb 1, 2006
Published in print: Feb 2006
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