Analyzing Passive Earth Pressure in Unsaturated Soil with Moisture and Mechanical Effects

What is it about?

This paper is about how soil moisture changes affect passive earth pressure, which is the resistance soil provides against movement, such as when a retaining wall pushes against it. It focuses on how soil absorbs and releases water (SWRC hysteresis) and how that impacts its mechanical behavior. The study examines different moisture levels, wall friction values, and air entry values (which affect how water moves through the soil) to estimate passive earth pressure using a mathematical method called the upper bound approach.

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Photo by Clay Banks on Unsplash

Photo by Clay Banks on Unsplash

Why is it important?

This study is important because understanding how soil moisture changes affect passive earth pressure can improve the design and stability of structures like retaining walls, foundations, and slopes. Many engineering projects rely on accurate predictions of soil behavior, especially in areas with fluctuating moisture levels due to rainfall, groundwater changes, or seasonal variations. By considering how soil absorbs and releases water (SWRC hysteresis) and its mechanical response, engineers can make more reliable calculations and reduce the risk of structural failures. The study’s findings help refine design methods by showing how factors like moisture content, wall friction, and air entry values influence soil resistance, leading to safer and more efficient construction practices.

Perspectives

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This study enhances geotechnical engineering by improving design standards for retaining walls and foundations, helping predict and mitigate structural failures due to soil moisture changes. It supports sustainable construction, ensuring efficient material use and stability under climate-driven moisture fluctuations. Additionally, it opens opportunities for further research in unsaturated soil mechanics and advanced modeling, contributing to safer and more resilient infrastructure.

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