Study of a Triaxial Testing System for Unsaturated Subgrade Fillers Using a High-Suction Tensiometer and Photogrammetry
Source abstract
Abstract
This study examines a triaxial testing system for unsaturated subgrade fillers, utilizing a high-suction tensiometer and photogrammetry to more accurately simulate and analyze their mechanical behavior. Digital image correlation (DIC) technology is combined with non-contact photogrammetry, employing a multi-ray tracing method to reconstruct the 3D model of the sample and monitor its volume changes. Real-time matric suction is measured using a high-suction tensiometer, avoiding traditional suction control methods and enabling a more accurate reproduction of deformation and suction changes in unsaturated soil samples under natural conditions. This study further analyzes key parameters, such as specific volume change, suction change, and shear failure state, under varying moisture content and stress conditions, with parameter calibration for mechanical behavior performed using the BBM model. This system significantly reduces traditional experimental time, offering a new tool for studying the mechanical behavior of unsaturated subgrade fillers, with substantial theoretical value and practical application potential.
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Research context
OpenAlex topics: Geotechnical Engineering and Underground Structures · Geotechnical Engineering and Soil Stabilization · Soil and Unsaturated Flow
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China
Funding
National Key Research and Development Program Project · National Natural Science Foundation of China · Heilongjiang Province Applied Technology Research and Development Program · 69th Batch of General Projects of China Postdoctoral Science Foundation
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