Quarry slope stability
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Key Factors in Quarry Slope Stability
Quarry slope stability is influenced by a combination of geological, structural, and operational factors. The physical and mechanical properties of the rock mass, the presence of discontinuities such as joints and faults, and the geometry of the slope (including bench height, width, and face angle) are critical in determining stability. Field data collection, laboratory testing, and geomechanical classification systems like Rock Mass Rating (RMR) and Geological Strength Index (GSI) are commonly used to assess these properties and inform stability analyses Fandy2024Bezie2024Martinelli2023.
Methods for Slope Stability Analysis in Quarries
Several analytical and numerical methods are used to evaluate quarry slope stability. Traditional limit equilibrium methods are suitable for simple slope geometries, while more complex quarry layouts benefit from advanced numerical modeling, such as finite element and continuum/discontinuum analyses, which provide a more accurate assessment of overall stability Fandy2024Martinelli2023Leroy2024. Kinematic analysis is essential for identifying potential failure modes, such as planar, wedge, and toppling failures, especially in jointed rock masses Er2014Bezie2024.
The Role of Technology in Slope Stability Assessment
Modern technologies, including photogrammetry, LiDAR, and drone-based remote sensing, have significantly improved the accuracy and efficiency of slope stability assessments. These methods enable the creation of detailed digital terrain models and 3D meshes, allowing for precise mapping of discontinuities and better prediction of potential failure zones. Photogrammetric and drone surveys provide more comprehensive data than traditional scanline surveys, especially for characterizing fracturing and structural domains across entire slope faces Kirikov2024Ingram2022Hartwig2021.
Influence of Slope Geometry and Support Measures
Slope geometry, particularly the bench face angle, has a major impact on stability. Studies show that reducing the bench face angle can substantially increase the safety factor, with a 70° angle often recommended for optimal stability in limestone quarries Bezie2024Заиров2024. In cases where slopes are found to be unstable, engineering improvements such as redesigning slope geometry, creating new working levels, or reinforcing with geotextiles and other support systems can effectively increase the factor of safety and prevent landslides Fandy2024Leroy2024.
Impact of Mining Methods and Blasting
The use of explosives for rock fragmentation can increase fracturing and reduce slope stability. Careful control of blasting techniques, such as staged blasting and the use of contour charges, helps minimize rock mass disturbance and maintain steeper, yet stable, slope angles. Dividing benches into sub-benches and sequential blasting can distribute loads more evenly and reduce the risk of collapse, especially in deep quarries with complex geological conditions Заиров2024Hartwig2021.
Integrating Multisource Data for Comprehensive Assessment
Combining data from field surveys, remote sensing, geophysical methods (like electrical resistivity tomography), and numerical modeling provides a more complete understanding of slope conditions. This integrated approach allows for the identification of hidden fractures, subsurface weak zones, and the effects of external loads, such as waste dumps, on slope stability. Such comprehensive assessments are essential for optimizing slope design, reducing overburden, and ensuring long-term safety and efficiency in quarry operations Rysbekov2025Martinelli2023Hartwig2021.
Conclusion
Quarry slope stability is a multifaceted challenge that requires a combination of field data, advanced modeling, and modern remote sensing technologies. Key factors include rock mass properties, slope geometry, and operational practices such as blasting. Integrating multisource data and employing both traditional and advanced analytical methods enable more accurate stability assessments and safer, more efficient quarry designs. Regular monitoring and timely engineering interventions are crucial for maintaining stable slopes and preventing hazardous failures.
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