Investigation of the Mechanical Properties of Calcareous Sand Improved by Polyurethane Foam Adhesive Under Fixed Principal Stress Axes Shearing
Dan Chang, Yongjun Xie, Xinghua Zhang, Jiankun Liu
TL;DR
This study examines how polyurethane improves the strength of calcareous sand under different stress conditions, offering insights for engineering applications.
Contribution
The study introduces a modified Lade criterion for predicting multiaxial strength with polymer content and a generalized linear strength theory.
Findings
Failure strength decreases at α = 45° and increases afterward with a 30% decrease and 25% increase at 5% polyurethane.
Non-coaxial angles between strain and stress directions reached up to 15°, increasing with polyurethane content.
Polyurethane content increased sample strength by 20% at θσ = −19.1° and α = 60°.
Abstract
The mechanical properties and envelope curve predictions of polyurethane-improved calcareous sand are significantly influenced by the magnitude and direction of principal stress. This study conducted a series of directional shearing tests with varying polyurethane contents (c = 2.5%, 5%, and 7.5%), stress Lode angles (θσ = −19.1°, 0°, 19.1°, and 30°), and major principal stress angles (α = 0°, 30°, 45°, 60°, and 90°) to investigate the strength and non-coaxial characteristics of calcareous sand improved by polyurethane foam adhesive (PFA). Key findings revealed that failure strength varied significantly with the major principal stress axis direction, initially decreasing to a minimum at α = 45° before increasing, with a 30% decrease and 25% increase observed at c = 5%. Non-coaxial characteristics between strain increment and stress directions became more pronounced, with angles varying…
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Taxonomy
TopicsGeotechnical Engineering and Soil Stabilization · Grouting, Rheology, and Soil Mechanics · Geotechnical Engineering and Underground Structures