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• <br />FIGURE ~on•t • <br />SUNNARI OF SLOPE DESIGN PROCEDURES <br />Category Prot edure Bes[ Ae~ication Limitation__ Remarks_Y_ _ <br />slide teriaLs that are costly and performed to ensure proper <br />may be unavailable; may use and placement area of <br />have excavation waste that lightweight materials. <br />creates problems; requires <br />consideration of availability <br />of right-of-way. <br />Increase resisting Drain subsurface <br />forces <br />~~ Use buttress and <br />counterweight <br />fills <br />Install piles <br />Install anchors <br />Treat chemically <br />A[ any slide where water <br />table is above shear plane <br />A[ an existing slide, in com- <br />binati on with other methods <br />To prevent movement or <br />strain before excavation <br />Yh ere ri ght s-of-way adjacent <br />to highway are limited <br />4here sliding surface is well <br />defined and soil reacts posi <br />lively to treatment <br />Requires experienced per- <br />sonnel to install and en- <br />sure effective operation. <br />May not be effective on <br />deep-sealed slides; must be <br />founded on a firm base. <br />Yill not stand large strains; <br />must penetrate well below <br />sliding surface. <br />Involves depth Control based <br />on ability of foundation <br />soils to resist shear forces <br />from anchor tension <br />Nay be reversible action; has <br />no[ had long-term effective- <br />ness evaluated <br />Stability analysis is required <br />to determine soil pile force <br />system for safe design <br />Study must be made of in <br />situ soil shear strengh t; <br />economics of methods is <br />function of anchor depth <br />and frequency <br />Laboratory study of soil- <br />chemical treatment must <br />precede field installation <br />