January 12, 2021

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Babak Mahmoodi Coauthored a Paper on Assessing Persistence of Entrapped Gas in the Journal of Geotechnical and Geoenvironmental Engineering-ASCE

Babak Mahmoodi, Ph.D. (Massachusetts) coauthored a paper entitled "Assessing Persistence of Entrapped Gas for Induced Partial Saturation" that was published in the Journal of Geotechnical and Geoenvironmental Engineering - American Society of Civil Engineers (ASCE) in Volume 147, Issue 3, in December 2020.

Babak was the lead author and his coauthor was Aaron Gallant, Ph.D.     

Babak Mahmoodi is a Senior Staff Professional based in Massachusetts focused on ground improvement, slope stability analyses, settlement analyses, and retaining wall design.

The Journal of Geotechnical and Geoenvironmental Engineering covers the broad area of practice known as geotechnical engineering. Papers are welcomed on topics such as foundations, retaining structures, soil dynamics, engineering behavior of soil and rock, site characterization, slope stability, dams, rock engineering, earthquake engineering, environmental geotechnics, geosynthetics, computer modeling, groundwater monitoring and restoration, and coastal and geotechnical ocean engineering. Authors are also encouraged to submit papers on new and emerging topics within the general discipline of geotechnical engineering.

The American Society of Civil Engineers represents more than 150,000 members of the civil engineering profession in 177 countries. Founded in 1852, ASCE is the nation's oldest engineering society.


Induced partial saturation (IPS) is a novel method to suppress the generation of excess pore-water pressure and increase the liquefaction resistance of loose granular soils. Mechanical benefits associated with IPS are linked to the persistence of entrapped bubbles. Civil infrastructure operates for decades, often longer than a century, and thus the longevity of gas is a salient consideration for adoption of IPS in practice. Modeling the physical and chemical mechanisms that influence the persistence of entrapped bubbles is a practical avenue to address gas durability on these time scales, a limitation of physical experiments. The governing aqueous-phase advection-diffusion processes and interphase gas kinetics associated with bubble dissolution are simulated in a finite-difference numerical framework, validated with elemental and bench-scale experiments, and then extended to address soil resaturation rates under different subsurface conditions. The study demonstrates that emplaced gas is durable to the extent where diffusion-induced and groundwater seepage-induced dissolution should not discourage advancement of IPS, but will not remain indefinitely. Potential solutions to mitigate the decay of a gassy soil layer are discussed.

More Information

Learn more about the article: https://doi.org/10.1061/(ASCE)GT.1943-5606.0002477.
Learn more about the sponsor:  https://civil.umaine.edu/
For consultation regarding Induced Partial Saturation for Liquefaction Mitigation, contact Babak Mahmoodi at This email address is being protected from spambots. You need JavaScript enabled to view it..
Learn more about Babak Mahmoodi at: https://www.linkedin.com/in/babakmahmoodi