Date of Award

Fall 2024

Project Type

Thesis

Program or Major

Civil Engineering

Degree Name

Master of Science

First Advisor

Majid Ghayoomi

Second Advisor

Fei Han

Third Advisor

Julie Paprocki

Abstract

Microbial Induced Partial Saturation (MIPS) is a sustainable and cost-effective approach to mitigate liquefaction; however, more research needs to be done to apply MIPS to a variety of different soil types and conditions. The investigation consisted of running a series of undrained strain-controlled cyclic Direct Simple Shear (DSS) tests on fully saturated samples with varying non-plastic fine and plastic fine content. Some tests have been conducted on MIPS-treated samples; however, more tests are needed to verify the results. Previous investigations have been conducted to evaluate the pore water pressure response of sands with added non-plastic fines with and without MIPS treatment, however, no such investigations have evaluated how the response changes with the addition of plastic fines. Even though higher plasticity soils have a less likely chance of liquefaction, it is pertinent to understand the difference in response of sands with nonplastic fines and plastic fines after undergoing MIPS treatment. The difference in soil structure may impact the effectiveness of MIPS treatment. Preliminary experimental results show minimal change in the impact of MIPS treatment on plastic fines vs non plastic fines.

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