Friction angle

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Friction angle

 

Peck et al. (1974) e Meyerhof (1956)

valid for non soft soils at depth < 5 m

correlation valid for sands and gravels, represents average values

traditional correlation widely used, valid for soils above groundwater table < 8 m for terrains within groundwater  table (stresses <8-10 t/m²)

 

inc_peck

Meyerhof, 1956

correlation valid for clay and fissured marl clay and loose fill

 

inc_meyerhof

 

sand and silt ≤ 5%: a=29.47; b=0.46; c= 0.004

sand and silt > 5%: a=23.7; b=0.57; c= 0.006

 

Sowers, 1962

friction angle in degrees valid for sands in general

optimal conditions for depths < 4 m above groundwater table and < 7 m for terrains within groundwater table, σ>5 t/m²

 

inc_sowers

 

De Mello, 1967

correlation valid for mainly sandy soils with friction angle < 38° at least 2 m depth

inc_demello

 

 

Malcev, 1964

friction angle in degrees valid for sands in general

optimal conditions for depths > 2 m and friction angle < 38°

 

inc_malcevi

 

Schmertmann, 1977

friction angle in degrees for diverse lithotypes (max values)

N.B. Values are often overly optimistic as derived from DR % indirect correlations.

 

 

inc_Schmertmann

 

Uniform fine sands: a= 28; b=0.14

Sands medium uniform: a=31.5; b=0.115

Sands medium grandate, Large uniform sands: a= 34.5, b= 0.1

Sands, gravels little silty, Gravel: a=38, b=0.08

Gravels: a=34.5, b=0.1

Dr=relative density [%]

 

ROAD BRIDGE SPECIFICATION

friction angle in degrees (Shioi and Fukuni, 1982) valid for sands, fine sands and silty sands at minimum 2 m depths below ground level

optimal conditions for depths >8 m over groundwater table and >15 m for terrains within groundwater table, σ>15 t/m²

 

(JAPANESE NATIONAL RAILWAY) Shioi-Fukuni 1982

friction angle in degrees  valid for gravels

friction angle in degrees valid for medium coarse sands gravelly sands and gravels (degrees) Shioi-Fukuni 1982 valid for minimum depths of 2 m

 

inc_japanese

 

Iwasaki et al., 1977

friction angle in degrees, valid for sands, medium and coarse and gravelly sands

optimal conditions for depths > 8 m above groundwater table and > 15 m for terrains within groundwater table, σ>15 t/m²

 

 


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