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� k <br /> 5 <br /> IV <br /> .-k <br /> I ! <br /> CURVE CONFIGURATION CRITERIA FOR APPLICATION IN THE �{ <br /> ANALYSIS OF R-VALUE- EXUDATION PRESSURE TEST DATA <br /> GENERAL € <br /> PROBABLE USE EXPECTED ALTERNATIVES IN CURVE SHAPE= <br /> PROBABLE <br /> R—VALUE IN STRUCTURAL B' SLOPE WHEN TEST DATA IS RELIABLE <br /> CLASS SAIL TYPES <br /> SECTION DESCRIPTION GRAPHICAL <br /> REPRESENTATION <br /> 1. .. „ .0 <br /> Crushed Rack Aggregate Base 1. Straight line <br /> Gravely <br /> Aggregate Subbase Horizontal. 2 , <br /> Sandy Gravel Seter:ted Material 2 Straight lines, <br /> 60 or Better Gently sloping <br /> Silty Grove[ down to right. 3. <br /> Clayey Gravel 3. Convex Upward, (c) <br /> Sand Decreasing R-Values <br /> to righs• <br /> Silty Sands Aggregate Subbase All curves steeply 1• 2. 3. <br /> Clayey Sands Imported Borrow inclined downward <br /> 30' to 60 Sandy Silt Selected MateriaE to right. R <br /> Silt I. Slightly Convex, <br /> Basement Soil Upward. Y <br /> Clayey Sill 2. Straight tine. <br /> 3. Slightly Concave, <br /> Upward. <br /> Clayey Sands Imported Borrow t. Concave Upward, 1. ` M4 <br /> Clayey Silts Selected Material Decreasing R-Values (c) <br /> 0 to 30 Sandy Clay Basement Soil to right. <br /> Silty Clay 2. Straight line,Gently (b) n <br /> sloping downward a} i <br /> Heavy Clay to right. 2. <br /> 3. Straight line, ; k <br /> Horizontal. Q <br /> FIGURE 15 w ' <br /> I° <br /> SSSS x <br /> r <br /> u,r <br /> r <br />