PDF Slope Stability Reference Guide - US Forest Service For cohesive soil, it varies linearly with the cohesion (C) value. N-values can also be used for liquefaction analysis. Cohesion (c) 10 kN/m2 20 kN/m2 30 kN/m2 Angle of Internal Friction (φ) 35° 20° 10° Angle of Soil-Metal Friction (δ) 22° 10° 6° Adhesion (Ca) 0 0 0 . Soil Mechanics and Classification PDF 8. STRENGTH OF SOILS AND ROCKS - University of Melbourne This has the effect of increasing the phi angle of the soil. Safe Bearing Capacity of Soil (SBC) - CivilDigital The values listed below represent edited avarge values based on literature and data from geotechical projects. In the database, the value of the clay content varies in the range of 4.09-47.96%, the . Cohesion of soils is the characteristic of the fine materials with particle size below about 0.002 mm (clay). Cohesive Soil: Unconfined Compressive Strength (Qu) Undrained Shear Strength (Su) The standard practice is to determine shear strength of cohesive soils in the field based on measurements with torvane, pocket penetrometer, or vane shear. Its definition is mainly derived from the Mohr-Coulomb failure criterion and it is used to describe the non-frictional part of the shear resistance which is independent of the normal stress. As such, considering soil cohesion as a constant parameter is far to be accurate. In these cases a straight line approximation over the relevant range of normal stress values is normally used. Typical values of δ for a sandy loam soil sliding over a steel surface are 20 to 22°, however, these values can fall as the surface finish becomes 'polished' to 15°. USCS Soil-class Description Cohesion (kPa) Friction angle (°) GW well-graded gravel, fine to coarse gravel 0 40 GP poorly graded gravel 0 38 GM silty gravel 0 36 GC clayey gravel 0 34 GM-GL silty gravel 0 35 GC-CL clayey gravel with many fines 3 29 SW well-graded sand, fine to coarse sand 0 38 SP poorly graded sand 0 36 SM silty sand 0 34
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