Experiments and Predictions of Soil Desaturation by Air-Injection Technique and the Implications Mediated by Multiphase Flow Simulation

Yasuhara, Hajime; Okamura, Mitsu; Kochi, Yoshinori

doi:10.3208/sandf.48.791

Cited by 30 publications

(35 citation statements)

References 15 publications

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“…Relatively larger vertically downward displacements around the edges of the foundation can suggest that the positive volumetric strains at locations away from the foundation were surpassed by the deviatoric strains, causing the foundation to settle more than those locations. This correlated well with the observations of several researchers [29][30][31][32].…”

Section: Soil Response and Displacement Mechanisms Beneath Shallow Fosupporting

confidence: 93%

“…Nevertheless, the influence of air injection on the soil's resistance to pore pressure generation appeared to decrease at shallow layers with low confining stresses (usually 2.1 m) and at locations away from the air injector, signifying the importance of confining stress for the liquefaction resistance of partially saturated soils [8] and the extent of air-entrapped zone [31]. Nevertheless, in the partially saturated soil (PS-2) the settlement of foundation reduced substantially, with a significantly smaller rate of co-seismic settlement.…”

Section: Soil Response and Displacement Mechanisms Beneath Shallow Fomentioning

confidence: 99%

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Influence of air injection on the liquefaction-induced deformation mechanisms beneath shallow foundations

Zeybek

Madabhushi

2017

Soil Dynamics and Earthquake Engineering

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The authors would like to thank the reviewers again for their time and additional comments. Based on the comments, we have attempted to cover all of their points and made changes of the manuscript, which are detailed below. Reviewer 2:The submitted manuscript presents very valuable information about the liquefaction induced deformation mechanism under the foundation in fully as well as well in partially saturated sands. However, the originality of the paper concerns me since there are figures and content published in another technical paper ("Centrifuge testing to evaluate the liquefaction response of air-injected partially saturated soils beneath shallow foundations" which has just been published in Bulletin of Earthquake Engineering). I would consider this manuscript as a technical note where most of the figures are not included and referred to the published article. The published manuscript and the submitted manuscripts presented the results from the same centrifuge tests. The results were just presented in different manners. There are same figures presented in both manuscripts as below:In the first and second round of revision, the authors were invited to revise the manuscript to address a number of technical comments. In the third round of revision, the most significant issue that has been raised by the reviewer is the originality of the paper. The authors believe that the changes made in the submitted manuscript do go a long way to ensuring that the main concern of the reviewer is addressed within the paper itself.Following the reviewer's comments, the manuscript has been changed significantly. A dataset from a series of two free-field centrifuge tests is included (see the amended Table 1). It is worth stating that the free-field test data has not been published elsewhere. The vast majority of the figures submitted in the second round of revised manuscript are replaced by the original figures. Accordingly, the relevant sections have been rewritten. The content of the paper has been significantly improved by adding more comprehensive discussions and a new dataset. The authors wish to thank the reviewers for this. 2.1-Figure 1 in both manuscripts show the same experimental setup.Answer 2.1-The cross-section of the models is modified following the comment of the reviewer, as given in Fig. 1 in this round of revised paper. Fig. 2 in published manuscript vs Fig. 6 in submitted manuscript. Answer 2.2-Following the reviewer's comment, the acceleration time histories in the previous manuscript ( Fig. 6) are removed from the manuscript and replaced by the shear stress-strain loops, as presented in Fig. 7 in the this round of revised paper. The effect of air injection on the shear stiffness of soil is demonstrated. It is noted that Fig. 2 in the published paper showed only the input (base) acceleration time histories recorded during the tests, whereas Fig. 6 submitted in the second round of revised manuscript presented the horizontal acceleration time histories recorded at different soil layers. Fig.3 in published ma...

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Section: Soil Response and Displacement Mechanisms Beneath Shallow Fosupporting

confidence: 93%

Section: Soil Response and Displacement Mechanisms Beneath Shallow Fomentioning

confidence: 99%

Influence of air injection on the liquefaction-induced deformation mechanisms beneath shallow foundations

Zeybek

Madabhushi

2017

Soil Dynamics and Earthquake Engineering

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“…Air injection into sand layers (Okamura and Teraoka, 2005;Okamura, 2006) and application of a discharge-recharge cycle of ground water (Takemura et al, 2009) are typical methods among others. The degree of saturation of desaturated soils by such methods may be roughly between 85z and 95z (Yasuhara et al, 2008;Takemura et al, 2009). Therefore, the range of relatively high degree of saturation is of interest in this study.…”

Section: Introductionmentioning

confidence: 99%

Liquefaction Resistances of Unsaturated Non-Plastic Silt

Okamura

Noguchi

2009

Soils and Foundations

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“…However, light well point method has shown better effects in treating complex situation such as water in weakly permeable layer, which has been widely used in foundation pit engineering and foundation treatment. Some scholars have carried out experimental and in situ detection study on the light well point [11][12][13] to learn the transmission law of vacuum pressure and seepage law of pore water [14][15][16][17][18][19][20]. Light well point method works as a vacuum pump pumping out the air in the well, the horizontal tube, and storage tank to form a negative pressure area in the soil.…”

Section: Introductionmentioning

confidence: 99%

Groundwater Level Distribution in Vacuum Dewatering Method in Phreatic Aquifer

et al. 2018

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Vacuum dewatering method has been widely used in geotechnical engineering. However, there is little research on the groundwater level distribution under the effect of vacuum pressure which is generated by vacuum wells. In view of this, the groundwater level distribution in phreatic aquifer is analyzed. First, the vacuum pressure distribution in soil is analyzed through Darcy's law and steady-state seepage control equation based on established particles and pores model. Second, the boundary conditions are modified by the vacuum pressure distribution law and then the water level distribution equations in flow boundary and waterhead boundary conditions are derived. Finally, dewatering experiment is carried out to analyze the water levels in vacuum and nonvacuum dewatering and verify the theoretical model of water level distribution in vacuum dewatering. The results show that, in both boundary conditions, the water levels in vacuum dewatering are lower than those in nonvacuum dewatering. The theoretical values agree with the experimental values well, which proves the rationality of theoretical equations and predicting the water levels in vacuum dewatering method.

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Experiments and Predictions of Soil Desaturation by Air-Injection Technique and the Implications Mediated by Multiphase Flow Simulation

Cited by 30 publications

References 15 publications

Influence of air injection on the liquefaction-induced deformation mechanisms beneath shallow foundations

Influence of air injection on the liquefaction-induced deformation mechanisms beneath shallow foundations

Liquefaction Resistances of Unsaturated Non-Plastic Silt

Groundwater Level Distribution in Vacuum Dewatering Method in Phreatic Aquifer

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