A comparison of foundation compaction techniques

1986 ◽  
Vol 23 (3) ◽  
pp. 271-280 ◽  
Author(s):  
Zoltan V. Solymar ◽  
David J. Reed
Keyword(s):  
Detailed Comparison ◽  
Penetration Resistance ◽  
Time Dependent ◽  
Soil Parameters ◽  
Strength Increase ◽  
Cone Penetration ◽  
Industrial Project ◽  
Design Considerations ◽  
Cone Penetration Resistance ◽  
Penetration Tests

Soil investigation programs established the presence of locally loose to medium dense noncohesive foundation materials at three major industrial project sites. It was neccessary to densify these materials to ensure that unacceptable differential settlements did not occur between separate foundations and to reduce the potential for liquefaction of the looser zones in the event of seismic disturbance. Horizontal ground accelerations of 0.05, 0.1, and 0.3 g were used in the respective seismic analyses for the three sites. Four different techniques for in-place compaction were employed to densify the loose to medium dense soils: vibro and impact compaction, compaction piling, and deep blasting.Site descriptions and soil parameters measured are presented. A short explanation of design considerations and production work procedures is followed by a detailed comparison of the improvements obtained, measured in terms of standard or static cone penetration resistance and true relative density. Problems encountered and phenomena observed during performance of the work are described, such as the time-dependent strength increase in disturbed sands. Key words: compaction piling, deep blasting, impact compaction, vibrocompaction, foundation, penetration tests.

Time‐Dependent Cone Penetration Resistance due to Blasting

1992 ◽  
Vol 118 (8) ◽  
pp. 1200-1215 ◽  
Author(s):  
Wayne A. Charlie ◽  
Mutabihirwa F. J. Rwebyogo ◽  
Donald O. Doehring
Keyword(s):  
Penetration Resistance ◽  
Time Dependent ◽  
Cone Penetration ◽  
Cone Penetration Resistance

Comparison of Measured and Back Estimated Cone Penetration Resistance of Sand

2008 ◽  
Author(s):  
Meen-Wah Gui ◽  
Dong-Sheng Jeng
Keyword(s):  
Penetration Resistance ◽  
Cavity Expansion ◽  
Cone Penetration ◽  
Cone Penetration Tests ◽  
Cone Tip Resistance ◽  
Tip Resistance ◽  
Cone Penetration Resistance ◽  
Expansion Theory ◽  
Cavity Expansion Theory ◽  
Penetration Tests

The application of cavity expansion theory in the back estimation of cone penetration tests conducted in calibration chambers has been carried out by many researchers. However, the theory is seldom employed by centrifuge modelers. Based on the work of spherical cavity expansion of previous researchers, this study proposed an analytical solution that incorporates the effects of cone geometry and surface roughness and the effect of compressibility to estimate the cone tip resistance. The calculated results are compared with the measured cone penetration resistance of four cone penetration tests performed in the centrifuge. The cone penetration tests were conducted in granular soil specimens having relative densities ranging between 54% and 89%. The comparison demonstrates the capacity of the cavity expansion theory in the prediction of the centrifuge cone penetration resistance.

Cone penetration tests in unsaturated silty sands

2016 ◽  
Vol 53 (3) ◽  
pp. 431-444 ◽  
Author(s):  
Hongwei Yang ◽  
Adrian R. Russell
Keyword(s):  
Effective Stress ◽  
Unsaturated Soils ◽  
Penetration Resistance ◽  
Silty Sand ◽  
Cone Penetration ◽  
Confining Stress ◽  
Cone Penetration Tests ◽  
Hydraulic Hysteresis ◽  
Cone Penetration Resistance ◽  
Penetration Tests

Very little is known about how to interpret cone penetration tests (CPTs) when performed in unsaturated soils. The few published studies on CPTs in unsaturated soils have focused on either clean sands or silt. In this study, new results of laboratory-controlled CPTs in an unsaturated silty sand are presented. Silty sand exhibits hydraulic hysteresis and suction hardening. Suction is observed to have a pronounced effect on measured cone penetration resistance. For an isotropic net confining stress of 60 kPa, it is observed that higher suctions give rise to cone penetration resistances that are 50% larger than those for lower suctions. A semi-theoretical correlation is presented that links measured cone penetration resistances to initial relative density and mean effective stress. Suction has an influence on cone penetration resistances through suction hardening, as well as its contribution to effective stress. For this silty sand, it is shown that failing to account for suction may result in significant overestimations and unsafe predictions of soil properties from measured cone penetration resistances.

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