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  2. Angle of repose - Wikipedia

    en.wikipedia.org/wiki/Angle_of_repose

    Angle of repose of a heap of sand Sandpile from the Matemateca collection. The angle of repose, or critical angle of repose, [1] of a granular material is the steepest angle of descent or dip relative to the horizontal plane on which the material can be piled without slumping. At this angle, the material on the slope face is on the verge of ...

  3. Soil mechanics - Wikipedia

    en.wikipedia.org/wiki/Soil_mechanics

    The angle of internal friction is thus closely related to the maximum stable slope angle, often called the angle of repose. But in addition to friction, soil derives significant shear resistance from interlocking of grains. If the grains are densely packed, the grains tend to spread apart from each other as they are subject to shear strain.

  4. Slope stability - Wikipedia

    en.wikipedia.org/wiki/Slope_stability

    It is important for many civil and geotechnical engineers to know the angle of repose to avoid structural and natural disasters. As a result, the application of retaining walls can help to retain soil so that the angle of repose is not exceeded. [5] The angle of repose and the stability of a slope are impacted by climatic and non-climatic factors.

  5. Izbash formula - Wikipedia

    en.wikipedia.org/wiki/Izbash_formula

    Figure d illustrates the reduction factors for stability at a slope with an angle of φ = 40 degrees, demonstrating the impact of slope angle relative to flow direction on the stability of objects. Due to the fact that a depth factor, K h , is included in this version of the Izbash formula, the average velocity above the stones can be ...

  6. Slope stability analysis - Wikipedia

    en.wikipedia.org/wiki/Slope_stability_analysis

    Both the friction angle and cohesion can be considered for each slice. In the general case of the method of slices, the forces acting on a slice are shown in the figure below. The normal ( E r , E l {\displaystyle E_{r},E_{l}} ) and shear ( S r , S l {\displaystyle S_{r},S_{l}} ) forces between adjacent slices constrain each slice and make the ...

  7. Ripple marks - Wikipedia

    en.wikipedia.org/wiki/Ripple_marks

    Current ripple marks, unidirectional ripples, or asymmetrical ripple marks are asymmetrical in profile, with a gentle up-current slope and a steeper down-current slope. The down-current slope is the angle of repose, which depends on the shape of the sediment.

  8. Mohr–Coulomb theory - Wikipedia

    en.wikipedia.org/wiki/Mohr–Coulomb_theory

    Angle of internal friction for some materials Material Friction angle in degrees Rock: 30 ° Sand: 30 ° to 45 ° Gravel: 35 ° Silt: 26 ° to 35 ° Clay: 20 ° Loose sand 30 ° to 35 ° Medium sand 40 ° Dense sand 35 ° to 45 ° Sandy gravel > 34 ° to 48 °

  9. Retaining wall - Wikipedia

    en.wikipedia.org/wiki/Retaining_wall

    The structure is constructed to resist the lateral pressure of soil when there is a desired change in ground elevation that exceeds the angle of repose of the soil. [ 1 ] A basement wall is thus one kind of retaining wall; however, the term usually refers to a cantilever retaining wall, which is a freestanding structure without lateral support ...

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