By C. R. Scott
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Additional info for An introduction to soil mechanics and foundations
Computation of the various forces that enter the safety factor calculation begins with the most important force which is weight of the slide mass W . Although this calculation is straightforward and is simply the product of specific weight γ times slide volume V , that is, W = γ V , calculation of the volume using slope height and angles that define the failure surface and slope face is helpful in bringing these variable into an explicit relationship. 7) where H = slope height (vertical distance from toe to crest), b = breadth of slope (arbitrary distance perpendicular to the cross-section), α =failure surface angle measured from the horizontal, β = slope angle (face angle) measured from the horizontal.
Spacing is also considerably greater in cable bolted surface mine slopes compared with underground cable bolt spacing. Holes must always be drilled deep enough to intersect the failure plane, provide for adequate grouted anchorage length, and for some sludge settling in the hole bottom. Anchorage length is determined by bond strength and must be sufficient to support the ultimate tensile load the hole assemblage can sustain. In this regard, the entire hole length may not be grouted, especially if pretensioning is done.
3 shows a potential planar block slide in cross section that has a possible tension crack near the crest of the slope. A Mohr–Coulomb (MC) strength criterion is reasonable for many rock and soil slopes. 3) where φ is the rock mass angle of internal friction. This simple formula masks several practical difficulties that include determining a likely failure surface and the strength properties of the considered surface. These difficulties must be resolved before proceeding with the computation of resisting and driving forces.
An introduction to soil mechanics and foundations by C. R. Scott