Study on the mechanical properties and microscopic evolution mechanisms of weathered granite soil
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View abstract on PubMed
Summary
This summary is machine-generated.Weathering degrades weathered granite soil (WGS) mechanical properties, reducing friction angle and cohesion. This research links microscopic changes to macroscopic behavior for improved engineering and disaster prediction.
Area Of Science
- Geotechnical Engineering
- Soil Science
- Materials Science
Background
- Understanding the impact of weathering on granite soil is crucial for geotechnical applications.
- Microscopic changes significantly influence the macroscopic mechanical behavior of weathered granite soil (WGS).
- Previous studies highlight the need for a comprehensive analysis of weathering effects on WGS.
Purpose Of The Study
- To investigate the influence of weathering on the mechanical properties of WGS.
- To analyze the microscopic evolution of WGS during weathering.
- To establish correlations between WGS mechanical parameters and chemical weathering indices.
Main Methods
- Systematic monotonic and cyclic triaxial tests were performed on WGS samples.
- Microscopic tests were conducted to observe the structural and mineralogical changes.
- Correlation analysis was used to link mechanical parameters with chemical weathering indices.
Main Results
- Progressive weathering leads to decreased effective internal friction angle and effective cohesion in WGS.
- Completely weathered granite (CWG) demonstrated higher dynamic strength than granite residual soil (GRS).
- Weathering involves loss of quartz and the formation of secondary minerals (kaolinite, illite) from feldspar and biotite, enriching aluminum and iron content.
Conclusions
- Weathering significantly deteriorates the structural integrity and mechanical performance of WGS.
- A strong correlation (60-99% R²) exists between WGS mechanical parameters and chemical weathering indices.
- The findings provide fundamental insights into WGS performance changes, aiding engineering design and disaster prediction.
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