Effects of Pore Fluid Compressibility on Liquefaction Resistance of Partially Saturated Sand

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

“…6, together with the well-ˆtted predictions by Eq. (12). The parameters used for theˆtting is tabulated in Table 2.…”

“…Yoshimi et al (1989) have conducted cyclic torsional shear tests and concluded that a soil specimen shows threefold liquefaction resistance ratio as the degree of saturation decreases from fully-saturated to 70z. Okamura and Soga (2006) derived in‰uential factors of the liquefaction resistance of a partially saturated sand from theoretical consideration and eŠects of the factors are examined through a series of triaxial tests. They found a unique relationship between the ratio of liquefaction resistance ratio of partially saturated sand to that saturated and the potential volumetric strain.…”

Liquefaction of Unsaturated Sand Considering the Pore Air Pressure and Volume Compressibility of the Soil Particle Skeleton

“…In fact, in the case ofˆne clean sand, it is known that the cyclic shear strength of fully saturated soil doubles when the degree of saturation decreases to 90z under ordinary testing conditions (e.g., Yoshimi et al, 1989;Tsukamoto et al, 2002;Selim et al, 2006). Recently, Okamura et al (2006) discussed the factors of liquefaction resistance of partially saturated sand in a series of cyclic triaxial tests, by taking the countermeasures to liquefaction into account. Their results con-ˆr med that the degree of saturation has a signiˆcant eŠect on liquefaction resistance and that amount of liquefaction resistance depends on the initial conˆning pressure and the initial pore pressure.…”

Mitigation of soil liquefaction using microbially induced desaturation

“…It has long been understood that the soil strength under cyclic conditions increases with the decrease in the saturation degree (Yang et al, 2004;Okamura and Soga, 2006). and found that it is also the case for static loading conditions.…”

“…However, research has shown that undrained shear strength and liquefaction resistance of loose saturated sand can be improved as the degree of saturation reduces. In cyclic triaxial and cyclic torsional shear tests, if the degree of saturation of initially saturated sand is reduced by merely a few percentage points, the cyclic strength can be much increased (Yang et al, 2004;Okamura and Soga, 2006). Likewise, in shaking table tests, liquefaction susceptibility in desaturated sand can be reduced by showing a much lower excess pore water pressure generation and much smaller volumetric deformation, in contrast to its fully saturated counterpart (Okamura and Teraoka, 2005;Yegian et al, 2007;He et al, 2013a).…”